Object Operations

Last updated: 2021-04-23 10:40:58

    Overview

    This document provides an overview of APIs and SDK code samples related to simple operations, multipart operations, and other object operations.

    Simple operations

    API Operation Description
    GET Bucket (List Objects) Querying an object list Queries some or all objects in a bucket
    PUT Object Uploading an object using simple upload Uploads an object to a bucket
    POST Object Uploading an object using an HTML form Uploads an object using an HTML form
    HEAD Object Querying object metadata Queries the metadata of an object
    GET Object Downloading an object Downloads an object to the local file system
    OPTIONS Object Configuring a pre-flight request for CORS Sends a pre-flight request to confirm whether a real CORS request can be sent
    PUT Object - Copy Copying an object Copies an object to the destination path
    DELETE Object Deleting a single object Deletes an object from a bucket
    DELETE Multiple Objects Deleting multiple objects Deletes multiple objects from a bucket in a single request

    Multipart operations

    API Operation Description
    List Multipart Uploads Querying a multipart upload Queries the information on ongoing multipart uploads
    Initiate Multipart Upload Initializing a multipart upload Initializes a multipart upload
    Upload Part Uploading a part Uploads a file in multiple parts
    Upload Part - Copy Copying a part Copies an object as a part
    List Parts Querying uploaded parts Queries the uploaded parts of a specified multipart upload
    Complete Multipart Upload Completing a multipart upload Completes the multipart upload of the entire file
    Abort Multipart Upload Aborting a multipart upload Aborts a multipart upload task and deletes the uploaded parts

    Other operations

    API Operation Description
    POST Object restore Restoring an archived object Restores an archived object for access
    PUT Object acl Setting object ACL Sets the ACL for a specified object in a bucket
    GET Object acl Querying an object ACL Queries the ACL of an object

    Simple Operations

    Querying an object list

    API description

    Queries some or all objects in a bucket.

    Use case

    Sample 1. List all files in directory a.

    cos.getBucket({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Prefix: 'a/', /*Optional*/
    }, function(err, data) {
        console.log(err || data.Contents);
    });
    

    Response:

    {
        "Name": "examplebucket-1250000000",
        "Prefix": "",
        "Marker": "a/",
        "MaxKeys": "1000",
        "Delimiter": "",
        "IsTruncated": "false",
        "Contents": [{
            "Key": "a/3mb.zip",
            "LastModified": "2018-10-18T07:08:03.000Z",
            "ETag": "\"05a9a30179f3db7b63136f30aa6aacae-3\"",
            "Size": "3145728",
            "Owner": {
                "ID": "1250000000",
                "DisplayName": "1250000000"
            },
            "StorageClass": "STANDARD"
        }],
        "statusCode": 200,
        "headers": {}
    }
    

    Sample 2. List the files in directory a without deep traversal.

    cos.getBucket({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Prefix: 'a/', /*Optional*/
        Delimiter: '/',            /* Optional */
    }, function(err, data) {
        console.log(err || data.CommonPrefixes);
    });
    

    Response:

    {
        "Name": "examplebucket-1250000000",
        "Prefix": "a/",
        "Marker": "",
        "MaxKeys": "1000",
        "Delimiter": "/",
        "IsTruncated": "false",
        "CommonPrefixes": [{
            "Prefix": "a/1/"
        }],
        "Contents": [{
            "Key": "a/3mb.zip",
            "LastModified": "2018-10-18T07:08:03.000Z",
            "ETag": "\"05a9a30179f3db7b63136f30aa6aacae-3\"",
            "Size": "3145728",
            "Owner": {
                "ID": "1250000000",
                "DisplayName": "1250000000"
            },
            "StorageClass": "STANDARD"
        }],
        "statusCode": 200,
        "headers": {}
    }
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Prefix Matching prefix for object keys. This parameter limits the response to contain only object keys with the specified prefix. String No
    Delimiter A delimiter is a separating symbol used to group object keys. It is usually /. The identical paths between Prefix or, if no Prefix is specified, the beginning, and the first delimiter` are grouped and defined as a common prefix. All common prefixes will be listed. String No
    Marker Indicates where the object key listing begins. Entries are listed starting from the key after the Marker in UTF-8 lexicographical order by default. String No
    MaxKeys Maximum number of entries returned in a single response. Defaults to 1000. String No
    EncodingType Encoding type of the returned value. Valid value: url, meaning that the returned object keys are URL-encoded (percent-encoded) values. For example, "Tencent Cloud" will be encoded to %E8%85%BE%E8%AE%AF%E4%BA%91. String No

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - headers Headers returned by the request Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - Name Bucket name in the format of BucketName-APPID, such as examplebucket-1250000000 String
    - Prefix Matching prefix for object keys. Object key entries will be returned in UTF-8 lexicographical order, starting from the key after the marker. String
    - Marker By default, parts are listed in UTF-8 binary order, starting from the part after the marker. String
    - MaxKeys Maximum number of entries returned in a single response String
    - Delimiter Delimiter String
    - IsTruncated Specifies whether returned entries are truncated. Valid values: true, false String
    - NextMarker If returned entries are truncated, then NextMarker marks where the next listing should begin String
    - CommonPrefixes The identical paths between a specified prefix and the delimiter are grouped and defined as a common prefix. ObjectArray
    - - Prefix A single common prefix String
    - EncodingType Encoding type of the returned values. This parameter is applicable to Delimiter, Marker, Prefix, NextMarker, and Key, String
    - Contents A list of object metadata ObjectArray
    - - Key Object key, i.e., object name String
    - - ETag MD5 checksum of the object, such as "22ca88419e2ed4721c23807c678adbe4c08a7880". Note that double quotation marks are required at the beginning and the end. String
    - - Size Object size, in bytes String
    - - LastModified Last modified time of the object, in ISO 8601 format, for example, 2019-05-24T10:56:40Z String
    - - Owner Information about the object owner Object
    - - - ID Complete ID of the object owner in the format of qcs::cam::uin/[OwnerUin]:uin/[OwnerUin],
    such as qcs::cam::uin/100000000001:uin/100000000001, where 100000000001 is the uin.
    String
    - - - DisplayName Name of the part owner String
    - - StorageClass Storage class of the object. For the enumerated values, such as STANDARD, STANDARD_IA, ARCHIVE, and DEEP_ARCHIVE, please see Storage Class Overview. String

    Uploading an object using simple upload

    API description

    This API (PUT Object) is used to upload an object to a bucket. To call this API, you need to have permission to write the bucket.

    Note:

    1. The Key (filename) cannot end with /; otherwise, it will be identified as a folder.
    2. Each root account (AAPID) can have up to 1,000 bucket ACLs and an unlimited number of object ACLs. If you do not need an ACL for an object, you can choose not to configure an ACL for the object during upload. In this way, the object will inherit the permissions of its bucket by default.
    3. After an object is uploaded, you can use the same key to generate a pre-signed URL, which can be shared with other clients for downloading (to download, please use the GET method. The detailed API description is shown below). If your file is set to private-read, note that the pre-signed URL will only be valid for a certain period of time.

    Use case

    Simple upload is suitable for uploading small files.

    cos.putObject({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
        StorageClass: 'STANDARD',
        Body: fileObject, // Upload the file object.
        onProgress: function(progressData) {
            console.log(JSON.stringify(progressData));
        }
    }, function(err, data) {
        console.log(err || data);
    });
    

    Upload a string as the file content:

    cos.putObject({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
        Body: 'hello!',
    }, function(err, data) {
        console.log(err || data);
    });
    

    Create a directory:

    cos.putObject({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'a/', /*Required*/
        Body: '',
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    Body Content of the file to be uploaded. This parameter can be a File object or a Blob object. String\File\Blob Yes
    CacheControl Cache policy as defined in RFC 2616. It will be stored as the object metadata. String No
    ContentDisposition Filename as defined in RFC 2616. It will be stored as the object metadata. String No
    ContentEncoding Encoding format as defined in RFC 2616. It will be stored as the object metadata. String No
    ContentLength HTTP request length (in bytes) as defined in RFC 2616 String No
    ContentType Content type (MIME) as defined in RFC 2616. It will be stored as the object metadata. String No
    Expires Expiration time as defined in RFC 2616. It will be stored as the object metadata. String No
    Expect If Expect: 100-continue is used, the request content will be sent only after confirmation from the server is received. String No
    ACL Defines the ACL attribute of the object. For the enumerated values, such as default, private, and public-read, please see the Preset ACL section in ACL Overview.
    Note: if you do not need access control for the object, set default for this parameter or simply leave it blank. In this way, the object will inherit the permissions of the bucket.
    String No
    GrantRead Grants a user read access in the format: id="[OwnerUin]". You can use commas (,) to separate multiple users.
    To authorize a sub-account, use id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>".
    To authorize a root account, use id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>".
    Example: 'id="qcs::cam::uin/100000000001:uin/100000000001", id="qcs::cam::uin/100000000001:uin/100000000011"'
    String No
    GrantReadAcp Grants a user read access to the object’s ACL in the format: id="[OwnerUin]". You can use commas (,) to separate multiple users.
    To authorize a sub-account, use id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>".
    To authorize a root account, use id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>".
    Example: 'id="qcs::cam::uin/100000000001:uin/100000000001", id="qcs::cam::uin/100000000001:uin/100000000011"'
    String No
    GrantWriteAcp Grants a user write access to the object’s ACL in the format: id="[OwnerUin]". You can use commas (,) to separate multiple users.
    To authorize a sub-account, use id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>".
    To authorize a root account, use id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>".
    Example: 'id="qcs::cam::uin/100000000001:uin/100000000001", id="qcs::cam::uin/100000000001:uin/100000000011"'
    String No
    GrantFullControl Grants a user full access in the format: id="[OwnerUin]". You can use commas (,) to separate multiple users.
    To authorize a sub-account, use id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>".
    To authorize a root account, use id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>".
    Example: 'id="qcs::cam::uin/100000000001:uin/100000000001", id="qcs::cam::uin/100000000001:uin/100000000011"'
    String No
    StorageClass Storage class of the object. For the enumerated values, such as STANDARD (default), STANDARD_IA, ARCHIVE, and DEEP_ARCHIVE, please see Storage Class Overview. String No
    x-cos-meta-* User-defined headers, which will be returned as the object metadata. The maximum size is 2 KB. String No
    UploadAddMetaMd5 Sets x-cos-meta-md5 as the object’s MD5 checksum in the object’s metadata during upload in the format of a 32-bit lowercase string. Example: 4d00d79b6733c9cc066584a02ed03410 String No
    TaskReady Callback function when an upload task is created. The callback returns a taskId, which uniquely identifies the task and can be used to cancel (cancelTask), pause (pauseTask), or restart (restartTask) the task. Function No
    - taskId ID of the upload task String No
    onProgress Callback of the progress. Attributes of the response object progressData are as follows: Function No
    - progressData.loaded Size of the uploaded parts, in bytes Number No
    - progressData.total Size of the entire object, in bytes Number No
    - progressData.speed Upload speed, in bytes/s Number No
    - progressData.percent Percentage of the file upload progress, in decimal form. For example, 0.5 means 50% has been uploaded. Number No

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    - ETag MD5 checksum of the object. The value of ETag can be used to check whether the object was corrupted during the upload.
    Example: "09cba091df696af91549de27b8e7d0f6"
    Note that double quotation marks are required at the beginning and the end.
    String
    - Location The location where the uploaded file can be accessed String
    - VersionId Returns the version ID for versioning-enabled buckets. For buckets that have never had versioning enabled, this parameter is not returned. String

    Uploading an object using an HTML form

    The SDK for JS does not provide a method for the POST Object API. If you need to use this API, please see "Solution B: Upload with Form" in Practice of Direct Transfer for Web End.

    Querying object metadata

    API description

    This API is used to query the metadata of an object.

    Use case

    cos.headObject({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject', /*Required*/
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    IfModifiedSince If the object is modified after the specified time, the corresponding object metadata will be returned; otherwise, 304 will be returned. String No

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - statusCode HTTP status code returned by the request, such as 200 and 304. If no modification is made after the specified time, 304 will be returned. Number
    - headers Headers returned by the request Object
    - x-cos-object-type Indicates whether an object is appendable. Enumerated values: normal, appendable. The default value normal is not displayed if returned. String
    - x-cos-storage-class Storage class of the object. For the enumerated values, such as STANDARD (default), STANDARD_IA, ARCHIVE, and DEEP_ARCHIVE, please see Storage Class Overview. Note that STANDARD is not displayed if returned. String
    - x-cos-meta-* User-defined metadata String
    - NotModified Indicates whether an object is unmodified after the specified time. Boolean
    - ETag MD5 checksum of the object. The value can be used to check whether the object was corrupted during the upload.
    Example: "09cba091df696af91549de27b8e7d0f6"
    Note that double quotation marks are required at the beginning and the end.
    String
    - VersionId Returns the version ID for versioning-enabled buckets. For buckets that have never had versioning enabled, this parameter is not returned. String

    Downloading an object

    Note:

    This API is used to read object content. If you need to launch a browser to download the file, you can get the URL through cos.getObjectUrl and then start the download in the browser. For more information, please see Pre-signed URL.

    API description

    This API (GET Object) is used to get the content, in string format, of a specified file in a bucket.

    Use case

    cos.getObject({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
    }, function(err, data) {
        console.log(err || data.Body);
    });
    

    Get the file content with Range specified:

    cos.getObject({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
        Range: 'bytes=1-3', /*Optional*/
    }, function(err, data) {
        console.log(err || data.Body);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    ResponseContentType Sets the Content-Type parameter in the response header. String No
    ResponseContentLanguage Sets the Content-Language parameter in the response header. String No
    ResponseExpires Sets the Content-Expires parameter in the response header. String No
    ResponseCacheControl Sets the Cache-Control parameter in the response header. String No
    ResponseContentDisposition Sets the Content-Disposition parameter in the response header. String No
    ResponseContentEncoding Sets the Content-Encoding parameter in the response header. String No
    Range Byte range of the object as defined in RFC 2616. The range value must be in the format of bytes=first-last, where both first and last are offsets starting from 0. For example, bytes=0-9 means that you want to copy the first 10 bytes of data of the source object. If this parameter is not specified, the entire object will be downloaded. String No
    IfModifiedSince If the object is modified after the specified time, the object will be returned; otherwise, "304 (Not Modified)" will be returned. String No
    If-Unmodified-Since If the object is not modified after the specified time, the object will be returned; otherwise, "412 (precondition failed)" will be returned. String No
    IfMatch The object will be returned only if the value of ETag matches the specified value; otherwise, 412 (precondition failed)" will be returned. String No
    IfNoneMatch The object will be returned only if the value of ETag does not match the specified value; otherwise, "304 (not modified)" will be returned. String No
    VersionId Version ID of the object to download String No
    onProgress Callback of the progress. Attributes of the response object progressData are as follows: Function No
    - progressData.loaded Size of the downloaded parts, in bytes Number No
    - progressData.total Size of the entire object, in bytes Number No
    - progressData.speed Download speed, in bytes/s Number No
    - progressData.percent Percentage of the file download progress, in decimal form. For example, 0.5 means 50% has been downloaded. Number No

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty Object
    - statusCode HTTP status code returned by the request, such as 200, 304, 403, and 404 Number
    - headers Headers returned by the request Object
    - CacheControl Cache directives as defined in RFC 2616. This header will be returned only if it is contained in the object metadata or if it is specified in the request parameter. string
    - ContentDisposition File name as defined in RFC 2616, which will be returned only if it is contained in the object metadata or if it is specified in the request parameter String
    - ContentEncoding Encoding format as defined in RFC 2616, which will be returned only if it is contained in the object metadata or if it is specified in the request parameter String
    - Expires Cache expiration time as defined in RFC 2616, which will be returned only if it is contained in the object metadata or if it is specified in the request parameter String
    - x-cos-storage-class Storage class of the object. For the enumerated values, such as STANDARD and STANDARD_IA, please see Storage Class Overview.
    Note: If this header is not returned, the storage class is STANDARD.
    String
    - x-cos-meta-* User defined metadata String
    - NotModified If the request has IfModifiedSince, then the attributes of IfModifiedSince will be returned. If the file has been modified, false will be returned. If not, true will be returned Boolean
    - ETag MD5 checksum of the object. The value of ETag can be used to check whether the object was corrupted during the upload.
    Example: "09cba091df696af91549de27b8e7d0f6"
    Note that double quotation marks are required at the beginning and the end.
    String
    - VersionId Returns the version ID for versioning-enabled buckets. For buckets which have never had versioning enabled, this parameter is not returned String
    - Body Returned file content. Uses the String format by default. String

    Configuring pre-flight requests for cross-origin access

    API description

    This API (OPTIONS Object) is used to send a pre-flight request for the CORS configuration of an object. Before making a real CORS request, you can send an OPTIONS request that includes the source origin, HTTP method, and headers to COS for it to determine whether a real CORS request can be sent. If there is no CORS configuration, "403 Forbidden" will be returned. You can enable CORS for a bucket using the PUT Bucket cors API.

    Use case

    cos.optionsObject({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
        Origin: 'https://www.qq.com', /*Required*/
        AccessControlRequestMethod: 'PUT', /*Required*/
        AccessControlRequestHeaders: 'origin,accept,content-type' /*Optional*/
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    Origin Origin domain name of the simulated CORS request String Yes
    AccessControlRequestMethod HTTP method of the simulated CORS request String Yes
    AccessControlRequestHeaders Headers of the simulated CORS request String No

    Callback function description

    function(err, data) { ... }
    
    Parameter                                             Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty Object
    - headers Headers returned by the request Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - AccessControlAllowOrigin Source origins (separated by commas) of the simulated CORS request. If the origins are not allowed, this header will not be returned. Example: * String
    - AccessControlAllowMethods HTTP methods (separated by commas) of the simulated CORS request (for example, PUT,GET,POST,DELETE,HEAD). If the request method is not allowed, this header will not be returned. String
    - AccessControlAllowHeaders Headers (separated by commas) of the simulated CORS request (for example, accept,content-type,origin,authorization). If none of the stimulated request headers is allowed, this header will not be returned. String
    - AccessControlExposeHeaders Response headers supported by CORS, such as ETag. The headers are separated by commas String
    - AccessControlMaxAge The validity duration of results returned by the OPTIONS request, e.g. 3600 String
    - OptionsForbidden Indicates whether the OPTIONS request is forbidden. It is true if HTTP status code 403 is returned Boolean

    Copying an object

    API description

    This API (PUT Object - Copy) is used to create a copy of an existing COS object, that is, an object is copied from the source path (object key) to the destination path (object key). During the copy, object metadata and the ACLs can be modified.
    Users can use this API to create a copy, modify object metadata (the source object and destination file have the same attributes), and move or rename the object (first copy the object, and then call the delete API separately).

    Note:

    We recommend that you use this API to download an object of 1 MB-5 GB. For objects greater than 5 GB, please use the advanced copy API Slice Copy File.

    Use case

    cos.putObjectCopy({
        Bucket: 'examplebucket-1250000000', /*Required*/
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject', /*Required*/
        CopySource: 'sourcebucket-1250000000.cos.ap-guangzhou.myqcloud.com/sourceObject', /*Required*/
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview String Yes
    CopySource URL path of the source object. A historical version can be specified using the URL parameter ?versionId=<versionId>. String Yes
    ACL Defines the ACL attribute of the object. For the enumerated values, such as default, private, and public-read, please see the Preset ACL section in ACL Overview. Default value: default
    Note: If you do not need access control for the object, set this parameter to default or leave it empty. In this way, the object will inherit the permissions of the bucket it is stored in.
    String No
    GrantRead Grants a user read access in the format: id="[OwnerUin]". You can use commas (,) to separate multiple users.
    To authorize a sub-account, use id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>".
    To authorize a root account, use id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>".
    Example: 'id="qcs::cam::uin/100000000001:uin/100000000001", id="qcs::cam::uin/100000000001:uin/100000000011"'
    String No
    GrantWrite Grants the user write permission in the format: id="[OwnerUin]".
    You can use commas (,) to separate multiple users.
    To authorize a sub-account, use id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>".
    To authorize a root account, use id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>".
    Example: 'id="qcs::cam::uin/100000000001:uin/100000000001", id="qcs::cam::uin/100000000001:uin/100000000011"'
    String No
    GrantFullControl Grants the user full permission in the format: id="[OwnerUin]". You can use commas (,) to separate multiple users.
    To authorize a sub-account, use id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>".
    To authorize a root account, use id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>".
    Example: 'id="qcs::cam::uin/100000000001:uin/100000000001", id="qcs::cam::uin/100000000001:uin/100000000011"'
    String No
    MetadataDirective Indicates whether to copy the metadata. Enumerated values: Copy (default), Replaced. If set to Copy, the metadata of the source object will be copied directly and the user-defined metadata in the header will be ignored. If set to Replaced, the metadata of the source object will be replaced with the user-defined metadata in the header. If the destination and source paths are the same, that is, you want to modify the metadata, this parameter must be set to Replaced. String No
    CopySourceIfModifiedSince If the object is modified after the specified time, the operation will be performed; otherwise, 412 will be returned. This parameter can be used together with CopySourceIfNoneMatch. If it is used together with other conditions, a conflict will be returned. String No
    CopySourceIfUnmodifiedSince If the object is not modified after the specified time, the operation will be performed; otherwise, 412 will be returned. This parameter can be used together with CopySourceIfMatch. If it is used together with other conditions, a conflict will be returned. String No
    CopySourceIfMatch If the ETag of the object is the same as the specified one, the operation will be performed; otherwise, 412 will be returned. This parameter can be used together with CopySourceIfUnmodifiedSince. If it is used together with other conditions, a conflict will be returned. String No
    CopySourceIfNoneMatch If the Etag of the object is different from the specified one, the operation will be performed; otherwise, 412 will be returned. This parameter can be used together with CopySourceIfModifiedSince. If it is used together with other conditions, a conflict will be returned. string No
    StorageClass Storage class of the object. For the enumerated values, such as STANDARD (default) and STANDARD_IA, please see Storage Class Overview. String No
    x-cos-meta-* Other user-defined file headers String No

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    - ETag MD5 checksum of the object, such as "22ca88419e2ed4721c23807c678adbe4c08a7880". Note that double quotation marks are required at the beginning and the end. String
    - LastModified Last modified time of the object, for example, 2017-06-23T12:33:27.000Z String
    - VersionId Returns the version ID for versioning-enabled buckets. For buckets which have never had versioning enabled, this parameter is not returned String

    Deleting a single object

    API description

    This API (DELETE Object) is used to delete an object from a COS bucket. To call this API, you need to have permission to write the bucket.

    Use case

    cos.deleteObject({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject'        /* Required */
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    VersionId Version ID of the object or delete marker to delete String No

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - statusCode HTTP status code returned by the request, such as 200, 204, 403, and 404. If the deletion is successful or the object does not exist, an HTTP 204 or 200 status code will be returned. If the specified bucket is not found, an HTTP 404 status code will be returned. Number
    - headers Headers returned by the request Object

    Deleting multiple objects

    API description

    This API (DELETE Multiple Objects) is used to delete multiple objects from a bucket in a single request. You can delete up to 1,000 objects in a single request. There are two response modes you to choose from: Verbose and Quiet. The Verbose mode returns information about the deletion of each object, whereas the Quiet mode returns only information about error objects.

    Use case

    Deletee multiple files:

    cos.deleteMultipleObject({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Objects: [
            {Key: 'exampleobject'},
            {Key: 'exampleobject2'},
        ]
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Quiet Specifies whether to use the Quiet mode. If set to true, the Quiet mode is enabled. If set to false (default), the Verbose mode is enabled. Boolean No
    Objects The list of objects to delete ObjectArray Yes
    - Key Object key (object name), the unique identifier of an object in a bucket. For more information, please see Object Overview. String Yes
    - VersionId Version ID of the object or delete marker to be deleted String No

    Callback function description

    function(err, data) { ... }
    
    Parameter                                     Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 204, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty Object
    - statusCode HTTP status code returned by the request, such as 200, 204, 403, and 404 Number
    - headers Headers returned by the request Object
    - Deleted Lists objects deleted successfully ObjectArray
    - - Key Object key (object name), the unique identifier of an object in a bucket. For more information, please see Object Overview. String
    - - VersionId If the VersionId parameter is passed in, it will also be included in the response, indicating the version of the object or delete marker String
    - - DeleteMarker If versioning is enabled and the VersionId parameter is not specified, the deletion will not actually delete the file; instead, it will only add a new delete marker, indicating that the visible file has been deleted. Enumerated values: true, false String
    - - DeleteMarkerVersionId Returns the VersionId of the newly added delete marker if DeleteMarker is true String
    - Error Lists objects whose deletion failed ObjectArray
    - - Key Object key (object name), the unique identifier of an object in a bucket. For more information, please see Object Overview String
    - - Code Deletion failure error codes String
    - - Message Deletion failure error messages String

    Multipart Operations

    Querying multipart uploads

    API description

    This API (List Multipart Uploads) is used to query the ongoing multipart uploads. Up to 1,000 multipart uploads can be listed at a time.

    Use case

    Get the list of unfinished UploadIds prefixed with exampleobject. The following is an example:

    cos.multipartList({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Prefix: 'exampleobject', /*Optional*/
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Prefix This parameter limits the response to contain only object keys with the specified prefix. Note that when you query with the prefix specified, the returned object keys will still contain the prefix. String No
    Delimiter A delimiter is a separating symbol used to group object keys. It is usually /. The identical paths between Prefix or, if no Prefix is specified, the beginning and the first delimiter are grouped and defined as a common prefix. All common prefixes will be listed. String No
    EncodingType Encoding type of the returned value. Valid value: url String No
    MaxUploads Sets the maximum number of entries that can be returned at a time. Valid range: 1-1000. Defaults to 1000. String No
    KeyMarker Used together with upload-id-marker.
  • If upload-id-marker is not specified:
     - Only multipart uploads whose ObjectName is lexicographically greater than the specified key-marker will be listed.
  • If upload-id-marker is specified:
     - Multipart uploads whose ObjectName is lexicographically greater than the specified key-marker will be listed;
     - Multipart uploads whose ObjectName is lexicographically equal to the specified key-marker and the UploadID is larger than the upload-id-marker will be listed.
  • String No
    UploadIdMarker Used together with key-marker.
  • If key-marker is not specified:
     - upload-id-marker will be ignored.
  • If key-marker is specified:
     - Multipart uploads whose ObjectName is lexicographically greater than the specified key-marker will be listed;
     - Multipart uploads whose ObjectName is equal to the specified key-marker and the UploadID is greater than the upload-id-marker will be listed.
  • String No

    Callback function description

    function(err, data) { ... }
    
    Parameter                                Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    - Bucket Destination bucket for the multipart upload String
    - Encoding-Type Specifies the encoding type of the returned value. Valid value: url String
    - KeyMarker Marks the key after which the entry listing starts String
    - UploadIdMarker Marks the UploadId after which the entry listing starts String
    - NextKeyMarker If the returned list is truncated, the NextKeyMarker returned will be the starting point of the subsequent list String
    - NextUploadIdMarker If the returned list is truncated, the UploadId returned will be the starting point of the subsequent list String
    - MaxUploads The maximum number of returned entries. Valid value range: 1 - 1000 String
    - IsTruncated Indicates whether returned objects are truncated. Valid value: true or false String
    - Prefix Limits the response to keys that begin with the specified prefix String
    - Delimiter A delimiter is a separating symbol used to group object keys. It is usually /. The identical paths between Prefix or, if no Prefix is specified, the beginning and the first delimiter are grouped and defined as a common prefix. All common prefixes will be listed String
    - CommonPrefixs The identical paths between Prefix and Delimiter are grouped and defined as a common prefix ObjectArray
    - - Prefix Displays specific common prefixes String
    - Upload A collection of multipart upload information ObjectArray
    - - Key Name of the object, i.e. object key String
    - - UploadId ID of the current multipart upload String
    - - StorageClass Storage class of the parts. For the enumerated values, such as STANDARD, STANDARD_IA, ARCHIVE, and DEEP_ARCHIVE, please see Storage Class Overview. String
    - - Initiator Initiator of the current multipart upload Object
    - - - DisplayName Name of the upload initiator String
    - - - ID ID of the upload initiator in the format of qcs::cam::uin/<OwnerUin>:uin/<SubUin>
    For root accounts, <OwnerUin> and <SubUin> have the same value.
    String
    - - Owner Owner of the parts Object
    - - - DisplayName Name of the part owner String
    - - - ID Parts owner ID in the format: qcs::cam::uin/<OwnerUin>:uin/<SubUin>.
    For root accounts, <OwnerUin> and <SubUin> have the same value.
    String
    - - Initiated Start time of the multipart upload String

    Initializing a multipart upload operation

    API description

    This API (Initiate Multipart Upload) is used to initialize a multipart upload. After a successful operation, an upload ID will be returned, which can be used in the subsequent Upload Part requests.

    Use case

    cos.multipartInit({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
        UploadId: 'exampleUploadId',
        Body: fileObject
    }, function(err, data) {
        console.log(err || data);
        if (data) {
          uploadId = data.UploadId;
        }
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    CacheControl Cache policy as defined in RFC 2616. It will be stored as the object metadata. String No
    Content-Disposition Filename as defined in RFC 2616. It will be stored as the object metadata. String No
    ContentEncoding Encoding format as defined in RFC 2616. It will be stored as the object metadata. String No
    ContentType Content type (MIME) as defined in RFC 2616. It will be stored as the object metadata. String No
    Expires Cache expiration time as defined in RFC 2616. It will be stored as the object metadata. String No
    ACL Defines the ACL attribute of the object. For the enumerated values, such as default, private, and public-read, please see the Preset ACL section in ACL Overview. Default value: default
    Note: If you do not need access control for the object, set default for this parameter or leave it empty. In this way, the object will inherit the permissions of the bucket it is stored in.
    String No
    GrantRead Grants a user read access in the format: id="[OwnerUin]". You can use commas (,) to separate multiple users.
    To authorize a sub-account, use id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>".
    To authorize a root account, use id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>".
    Example: 'id="qcs::cam::uin/100000000001:uin/100000000001", id="qcs::cam::uin/100000000001:uin/100000000011"'
    String No
    GrantFullControl Grants a user full access in the format: id="[OwnerUin]". You can use commas (,) to separate multiple users.
    To authorize a sub-account, use id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>".
    To authorize a root account, use id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>".
    Example: 'id="qcs::cam::uin/100000000001:uin/100000000001", id="qcs::cam::uin/100000000001:uin/100000000011"'
    String No
    StorageClass Storage class of the object. For the enumerated values, such as STANDARD (default), STANDARD_IA, ARCHIVE, and DEEP_ARCHIVE, please see Storage Class Overview. String No
    x-cos-meta-* User-defined headers, which will be returned as the object metadata. The maximum size is 2 KB. String No
    UploadAddMetaMd5 Sets x-cos-meta-md5 as the object’s MD5 checksum in the object’s metadata during upload in the format of a 32-bit lowercase string. Example: 4d00d79b6733c9cc066584a02ed03410 String No

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    Bucket Name of the destination bucket for the multipart upload. The value is formed by connecting a user-defined string and the system-generated APPID with a hyphen, for example, examplebucket-1250000000. string
    Key Object key (object name), the unique identifier of an object in a bucket. For more information, please see Object Overview. String
    UploadId ID that can be used in subsequent uploads String

    Uploading a part

    API description

    This API (Upload Part) is used to upload a part after a multipart upload is initialized. It can upload up to 10,000 parts of 1 MB to 5 GB for a multipart upload.

  • When you use the `Initiate Multipart Upload` API to initiate a multipart upload, you can obtain the `uploadId`. This ID uniquely identifies the part and its position in the entire object.
  • Every time you call the `Upload Part` API, you need to pass `partNumber` (the part number) and `uploadId`. You can upload multiple parts out of order.
  • When the `uploadId` and `partNumber` of a new part are the same as those of a previously uploaded part, the old part will be overwritten. If the `uploadId` does not exist, the 404 error, "NoSuchUpload", will be returned.
  • Use case

    cos.multipartUpload({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject', /*Required*/
        UploadId: 'exampleUploadId',
        PartNumber: '1',
        Body: fileObject
    }, function(err, data) {
        console.log(err || data);
        if (data) {
          eTag = data.ETag;
        }
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    ContentLength HTTP request length (in bytes) as defined in RFC 2616 String Yes
    PartNumber Part number String Yes
    UploadId ID of the multipart upload task String Yes
    Body Content of the file part to be uploaded. This parameter can be a File object or a Blob object. String\File\Blob Yes
    Expect If Expect: 100-continue is used, the request content will be sent only after confirmation from the server is received. String No
    ContentMD5 Base64-encoded 128-bit MD5 checksum as defined in RFC 1864. This header is used to verify whether the file content has changed. String No

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object

    Copying a part

    API description

    This API (Upload Part - Copy) is used to copy the parts of an object from the source path to the destination path.

    Note:

    To upload an object in parts, you must first initialize the multipart upload. A unique descriptor (upload ID) will be returned in the response of the multipart upload initialization. This ID needs to be carried in the multipart upload request.

    Use case

    cos.uploadPartCopy({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject', /*Required*/
        CopySource: 'sourcebucket-1250000000.cos.ap-guangzhou.myqcloud.com/sourceObject', /*Required*/
        UploadId: 'exampleUploadId', /*Required*/
        PartNumber: '1', /*Required*/
    }, function(err, data) {
        console.log(err || data);
        if (data) {
          eTag = data.ETag;
        }
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    CopySource URL path of the source object. A historical version can be specified using the URL parameter ?versionId=<versionId>. String Yes
    PartNumber Part number String Yes
    uploadId To upload an object in parts, you must first initialize the multipart upload. The response of the multipart upload initialization will carry a unique descriptor (an upload ID), which needs to be carried in the multipart upload request. String Yes
    CopySourceRange Byte range of the source object. The range value must be in the format of bytes=first-last, where both first and last are offsets starting from 0. For example, bytes=0-9 means that you want to copy the first 10 bytes of data of the source object. If this parameter is not specified, the entire object will be copied. String No
    CopySourceIfMatch If the Etag of the object is the same as the specified one, the operation will be performed; otherwise, 412 will be returned. This parameter can be used together with x-cos-copy-source-If-Unmodified-Since. If it is used together with other conditions, a conflict will be returned. String No
    CopySourceIfNoneMatch If the ETag of the object is different from the specified one, the operation will be performed; otherwise, 412 will be returned. This parameter can be used together with x-cos-copy-source-If-Modified-Since. If it is used together with other conditions, a conflict will be returned. string No
    CopySourceIfUnmodifiedSince If the object is not modified after the specified time, the operation will be performed; otherwise, 412 will be returned. This parameter can be used together with x-cos-copy-source-If-Match. If it is used together with other conditions, a conflict will be returned String No
    CopySourceIfModifiedSince If the object is modified after the specified time, the operation will be performed; otherwise, 412 will be returned. This parameter can be used together with x-cos-copy-source-If-None-Match. If it is used together with other conditions, a conflict will be returned. String No

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    - ETag MD5 checksum of the object, such as "22ca88419e2ed4721c23807c678adbe4c08a7880". Note that double quotation marks are required at the beginning and the end. String
    - LastModified Last modified time of the object, in GMT format String

    Querying uploaded parts

    API description

    This API (List Parts) is used to query the uploaded parts of a specified multipart upload, i.e., listing all successfully uploaded parts of a multipart upload with a specified uploadId.

    Use case

    cos.multipartListPart({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
        UploadId: 'exampleUploadId', /*Required*/
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, see Regions and Access Domain Names String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    UploadId Multipart upload ID obtained from the Initiate Multipart Upload API String Yes
    EncodingType Encoding type of the returned value String No
    max-parts Maximum number of parts to return at a time. Defaults to 1000. string No
    PartNumberMarker By default, parts are listed in UTF-8 binary order, starting from the part after the marker. String No

    Callback function description

    function(err, data) { ... }
    
    Parameter                                       Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    - Bucket Destination bucket for the multipart upload String
    EncodingType Specifies the encoding type of the returned value String
    - Key Object key (object name), the unique identifier of an object in a bucket. For more information, please see Object Overview String
    - UploadId ID of the current multipart upload String
    - Initiator Initiator of the current multipart upload Object
    - - DisplayName Name of the upload initiator String
    - - - ID ID of the upload initiator in the format: qcs::cam::uin/<OwnerUin>:uin/<SubUin>.
    For root accounts, <OwnerUin> and <SubUin> have the same value.
    String
    - Owner Owner of the parts Object
    - - DisplayName Bucket owner username String
    - - ID Bucket owner ID, generally the user’s uin String
    - StorageClass Storage class of the parts. For the enumerated values, such as STANDARD, STANDARD_IA, ARCHIVE, and DEEP_ARCHIVE, please see Storage Classes Overview. String
    - PartNumberMarker By default, entries are listed in UTF-8 binary order, starting from the part after the marker. string
    NextPartNumberMarker If the returned list is truncated, the NextMarker returned will be the starting point of the subsequent list string
    - MaxUploads The maximum number of entries returned in a single request String
    - IsTruncated Indicates whether returned objects are truncated. Valid value: true or false String
    - Part Parts information list ObjectArray
    - - PartNumber Part number String
    - - LastModified Last modified time of the part String
    - - ETag MD5 algorithm checksum of the part String
    - - Size Part size, in bytes String

    Completing a multipart upload

    API description

    This API (Complete Multipart Upload) is used to complete a multipart upload. After all parts are uploaded via the Upload Part API, you need to call this API to complete the multipart upload. When using this API, you need to specify the PartNumber and ETag of each part in the request body for the part information to be verified.
    As the parts need to be merged after they are uploaded, and the merge takes several minutes, when the merge starts, COS will immediately return status code 200 and periodically return space information during the merge process to keep the connection active until the merge is completed. After that, COS will return the content of the merged parts in the body.

    • If any uploaded part is less than 1 MB in size, 400 EntityTooSmall will be returned when this API is called.
    • If the uploaded part numbers are not continuous, "400 InvalidPart" will be returned when this API is called.
    • If the part information entries in the request body are not sorted by number in ascending order, "400 InvalidPartOrder" will be returned when this API is called.
    • If the uploadId does not exist, "404 NoSuchUpload" will be returned when this API is called.

    Note:

    We recommend you either complete or abort a multipart upload as early as possible, as the uploaded parts of an incomplete multipart upload will take up storage capacity and incur storage fees.

    Use case

    cos.multipartComplete({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
        UploadId: 'exampleUploadId', /*Required*/
        Parts: [
            {PartNumber: '1', ETag: 'exampleETag'},
        ]
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    UploadId ID of the upload task String Yes
    Parts A list of information about the parts of the multipart upload ObjectArray Yes
    - PartNumber Part number String Yes
    - ETag MD5 checksum of each part.
    Example: "22ca88419e2ed4721c23807c678adbe4c08a7880"
    Note that double quotation marks are required at the beginning and the end.
    String Yes

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    - Location The location where the uploaded file can be accessed String
    - Bucket Destination bucket for the multipart upload String
    - Key Object key (object name), the unique identifier of an object in a bucket. For more information, please see Object Overview. String
    - ETag Unique ID of the merged file in the format of "uuid-<part quantity>".
    Example: "22ca88419e2ed4721c23807c678adbe4c08a7880-3"
    Note that double quotation marks are required at the beginning and the end.
    String

    Aborting a multipart upload

    API description

    This API is used to abort a multipart upload operation and delete the uploaded parts. If you call this API and there is an Upload Part request that is using the multipart upload, the request will fail. If the uploadId does not exist, 404 NoSuchUpload will be returned.

    Note:

    We recommend you either complete or abort a multipart upload as early as possible, as the uploaded parts of an incomplete multipart upload will take up storage capacity and incur storage fees.

    Use case

    cos.multipartAbort({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject', /*Required*/
        UploadId: 'exampleUploadId' /*Required*/
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    UploadId Multipart upload ID obtained from the Initiate Multipart Upload API String Yes

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object

    Other Operations

    Restoring an archived object

    API description

    This API (POST Object restore) is used to restore an archived COS object. The restored readable object is temporary. You can configure the object to keep it readable and set the time for the object to be deleted. You can use the Days parameter to specify the expiration time of the temporary object. If you have not initiated any operation on the object, such as copying it or extending its validity period, before it expires, the temporary object will be automatically deleted. A temporary object is only a copy of the archived object and the source archived object will always exist throughout this period.

    Use case

    cos.restoreObject({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',
        RestoreRequest: {
            Days: 1,
            CASJobParameters: {
                Tier: 'Expedited'
            }
        },
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    RestoreRequest Container for data restoration Object Yes
    - Days Sets the expiration time of the temporary copy. Number Yes
    - CASJobParameters A container for the archive job parameters Object Yes
    - - Tier Specifies one of the three data restoration modes supported by COS: Standard, which completes a restoration job in 3-5 hours; Expedited, which completes a restoration job in 15 minutes; and Bulk, which completes multiple restoration jobs in 5-12 hours. String Yes

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object

    Setting object ACL

    API description

    This API (PUT Object acl) is used to set the ACL of an object in a bucket.

    Note:

    The total number of policies associated with bucket ACL, Policy, and CAM under a single root account (i.e., under the same APPID) cannot exceed 1,000. There is no upper limit on the number of object ACL rules. If you do not need access control for an object, do not make any configuration. In this way, the object will inherit the permissions of its bucket.

    Use case

    cos.putObjectAcl({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
        ACL: 'public-read', /*Optional*/
    }, function(err, data) {
        console.log(err || data);
    });
    

    Grant a user all permissions to an object:

    cos.putObjectAcl({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
        GrantFullControl: 'id="100000000001"' // 100000000001 is the uin of the root account.
    }, function(err, data) {
        console.log(err || data);
    });
    

    Grant permission to write the object via AccessControlPolicy:

    cos.putObjectAcl({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
        AccessControlPolicy: {
            "Owner": { // `Owner` is required in `AccessControlPolicy`
                "ID": 'qcs::cam::uin/100000000001:uin/100000000001' // 100000000001 is the QQ account number of the user owning the bucket
            },
            "Grants": [{
                "Grantee": {
                    "ID": "qcs::cam::uin/100000000011:uin/100000000011", // 100000000011 is the QQ account number
                },
                "Permission": "WRITE"
            }]
        }
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview String Yes
    ACL Defines the ACL attribute of the object. For the enumerated values, such as default, private, and public-read, please see the Preset ACL section in ACL Overview. Default value: default
    Note: If you do not need access control for the object, set default for this parameter or leave it empty. In this way, the object will inherit the permissions of the bucket it is stored in.
    String No
    GrantRead Grants the user read permission in the format: id="[OwnerUin]". You can use commas (,) to separate multiple users.
  • To authorize a sub-account, use id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>".
  • To authorize a root account, use id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>".
    Example: 'id="qcs::cam::uin/100000000001:uin/100000000001", id="qcs::cam::uin/100000000001:uin/100000000011"'
  • String No
    GrantFullControl Grants the user full permission in the format: id="[OwnerUin]". You can use commas (,) to separate multiple users.
  • To authorize a sub-account, use id="qcs::cam::uin/<OwnerUin>:uin/<SubUin>".
  • To authorize a root account, use id="qcs::cam::uin/<OwnerUin>:uin/<OwnerUin>".
    Example: 'id="qcs::cam::uin/100000000001:uin/100000000001", id="qcs::cam::uin/100000000001:uin/100000000011"'
  • String No
    AccessControlPolicy Sets an object's ACL attributes Object No
    - Owner Object owner information Object No
    - - ID Object owner ID in the format: qcs::cam::uin/<OwnerUin>:uin/<SubUin>
    For root accounts, <OwnerUin> and <SubUin> have the same value.
    String No
    - - - DisplayName Object owner name String No
    - Grants List of information on the grantee and permissions ObjectArray No
    - - Permission Permission granted. Enumerated values: READ, WRITE, READ_ACP, WRITE_ACP, FULL_CONTROL String No
    - - Grantee Grantee information Object No
    - - - DisplayName Grantee Name String No
    - - - ID ID of the authorized user in the format: qcs::cam::uin/<OwnerUin>:uin/<SubUin>
    For root accounts, <OwnerUin> and <SubUin> have the same value.
    String No

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - statusCode HTTP status code returned by the request, such as 200, 204, 403, and 404 Number
    - headers Headers returned by the request Object

    Querying object ACL

    API description

    The API (GET Object acl) is used to query the ACL of an object. Only the owner of the bucket has the permission to use this API.

    Use case

    cos.getObjectAcl({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    - ACL Defines the ACL attribute of the object. For the enumerated values, such as default, private, and public-read, please see the Preset ACL section in ACL Overview. Default value: default
    Note: If you do not need access control for the object, set default for this parameter or leave it empty. In this way, the object will inherit the permissions of the bucket it is stored in.
    String
    - Owner Identifies the owner of the resource Object
    - - ID Object owner ID in the format of qcs::cam::uin/<OwnerUin>:uin/<SubUin>
    For root accounts, <OwnerUin> and <SubUin> have the same value.
    String
    - - DisplayName Object owner name String
    - Grants List of information on the grantee and permissions ObjectArray
    - - Permission Permission granted. Enumerated values: READ, WRITE, READ_ACP, WRITE_ACP, FULL_CONTROL String
    - - Grantee Grantee information Object
    - - - DisplayName User Name String
    - - - ID User ID in the format: qcs::cam::uin/<OwnerUin>:uin/<SubUin>
    For root accounts, <OwnerUin> and <SubUin> have the same value.
    String

    Advanced APIs (Recommended)

    The following methods encapsulate the native methods mentioned above. They can implement the complete process of multipart upload/copy and support concurrent multipart upload/copy, checkpoint restart as well as canceling, pausing, and restarting upload tasks.

    Uploading an object in parts

    API description

    This API (Slice Upload File) is used to upload large files in parts.

    Note:

    • If the browser is not closed, you can suspend, restart, or cancel the upload job.
    • If you upload the same file to the same bucket path after refreshing the browser, the file content will be verified based on UploadId and the upload will proceed if the verification is passed.

    Use case

    cos.sliceUploadFile({
        Bucket: 'examplebucket-1250000000',                               /* Required */
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject',              /* Required */
        Body: fileObject,               /*Required*/
        TaskReady: function(taskId) { /*Optional*/
            console.log(taskId);
        },
        onHashProgress: function (progressData) { /* Optional */
            console.log(JSON.stringify(progressData));
        },
        onProgress: function (progressData) { /* Optional */
            console.log(JSON.stringify(progressData));
        }
    }, function(err, data) {
        console.log(err || data);
    });
    

    Parameter description

    | Parameter                                  | Description | Type |
    | ------------------------------------------------------------ | ------------------------------------------------------------ | --------- | ---- |
    | Bucket | Bucket name in the format of BucketName-APPID | String | Yes |
    | Region | Bucket region. For the enumerated values, please see Regions and Access Endpoints. | String | Yes |
    | Key | Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. | String | Yes |
    | Body | Content of the file part to be uploaded, which can be a File object, or a Blob object | File\Blob | Yes |
    | SliceSize | Part size | String | No |
    | AsyncLimit | Concurrent number of parts being uploaded | String | No |
    | StorageClass | Storage class of the object. For the enumerated values, such as STANDARD, STANDARD_IA, ARCHIVE, and DEEP_ARCHIVE, please see Storage Class Overview. | String | No |
    | UploadAddMetaMd5 | Sets x-cos-meta-md5 as the object’s MD5 checksum in the object’s metadata during upload in the format of a 32-bit lowercase string. Example: 4d00d79b6733c9cc066584a02ed03410 | String | No |
    | TaskReady | Callback function when an upload task is created. The callback returns a taskId, which uniquely identifies the task and can be used to cancel (cancelTask), pause (pauseTask), or restart (restartTask) the task. | Function | No |
    | - taskId | Upload task number | String | No |
    | onHashProgress | Progress callback function for file MD5 checksum calculation. The callback parameter is the progress object progressData | Function | No |
    | - progressData.loaded | Size of the verified parts, in bytes | Number | No |
    | - progressData.total | Total file size in bytes | Number | No |
    | - progressData.speed | File verification speed in bytes/s | Number | No |
    | - progressData.percent | Percentage of the file verification progress, in decimal form. For example, 0.5 means 50% has been verified. | Number | No |
    | onProgress | File upload progress callback function. The callback parameter is the object in progress progressData | Function | No |
    | - progressData.loaded | Size of the uploaded parts, in bytes | Number | No |
    | - progressData.total | Total file size in bytes | Number | No |
    | - progressData.speed | File upload speed in bytes/s | Number | No |
    | - progressData.percent | Percentage of the file upload progress, in decimal form. For example, 0.5 means 50% has been uploaded. | Number | No |

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    - Location The location where the uploaded file can be accessed String
    - Bucket Destination bucket for the multipart upload String
    - Key Object key (object name), the unique identifier of an object in a bucket. For more information, please see Object Overview. String
    - ETag Unique ID of the merged file in the format of "uuid-<part quantity>".
    Example: "22ca88419e2ed4721c23807c678adbe4c08a7880-3"
    Note that double quotation marks are required at the beginning and the end.
    String
    - VersionId The version ID will be returned for buckets that have enabled versioning. If the bucket has never enabled versioning, no value will be returned String

    Copying an object

    API description

    This API (Slice Copy File) is used to copy an object from the source path to the destination path through multipart copy. During the copy, the object metadata and ACL can be modified. You can use this API to move, rename, and copy a file or modify its attributes.

    Method prototype

    Call Slice Copy File:

    cos.sliceCopyFile({
        Bucket: 'examplebucket-1250000000', /*Required*/
        Region: 'COS_REGION',     /* Bucket region. Required */
        Key: 'exampleobject', /*Required*/
        CopySource: 'sourcebucket-1250000000.cos.ap-guangzhou.myqcloud.com/sourceObject', /*Required*/
        onProgress:function (progressData) { /*Optional*/
            console.log(JSON.stringify(progressData));
        }
    },function (err,data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    Bucket Bucket name in the format of BucketName-APPID String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    Key Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview. String Yes
    CopySource URL path of the source object. A historical version can be specified using the URL parameter ?versionId=<versionId>. String Yes
    ChunkSize Size (in bytes) of each part in the multipart copy. Defaults to 1048576 (1 MB). Number No
    SliceSize Specifies the minimum file size (in bytes) to use multipart copy. The default value is 5 GB. If the file size is equal to or smaller than this value, the file will be uploaded using putObjectCopy; otherwise, it will be uploaded using sliceCopyFile. Number No
    onProgress Callback of the upload progress. The callback parameter is the progress object progressData. Function No
    - progressData.loaded Size of the uploaded parts, in bytes Number No
    - progressData.total Total file size in bytes Number No
    - progressData.speed Upload speed, in bytes/s Number No
    - progressData.percent Percentage of the file copy progress, in decimal form. For example, 0.5 means 50% has been copied. Number No

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    - Location The location where the uploaded file can be accessed String
    - Bucket Destination bucket for the multipart upload String
    - Key Object key (object name), the unique identifier of an object in a bucket. For more information, please see Object Overview. String
    - ETag MD5 checksum of the merged file.
    Example: "22ca88419e2ed4721c23807c678adbe4c08a7880"
    Note that double quotation marks are required at the beginning and the end.
    String
    - VersionId Uploads an object in a version control-enabled bucket returns the version ID of the object. This parameter is not returned if the bucket has never been enabled String

    Batch upload

    API description

    Method 1:
    You can call putObject and sliceUploadFile multiple times to implement batch uploads. You can instantiate the FileParallelLimit parameter to limit how many objects (default value: 3) can be uploaded at the same time.

    Method 2:
    You can call cos.uploadFiles to implement batch uploads. The SliceSize parameter can be used to set a size limit to determine whether sliceUploadFile is used. The following describes how to use the uploadFiles method:

    Method prototype

    Call uploadFiles:

    cos.uploadFiles({
        files: [{
            Bucket: 'examplebucket-1250000000', // Format: BucketName-APPID
            Region: 'COS_REGION',     /* Bucket region. Required */
            Key: 'exampleobject',
            Body: fileObject1,
        }, {
            Bucket: 'examplebucket-1250000000', // Format: BucketName-APPID
            Region: 'COS_REGION',     /* Bucket region. Required */
            Key: 'exampleobject2',
            Body: fileObject2,
        }],
        SliceSize: 1024 * 1024,
        onProgress: function (info) {
            var percent = parseInt(info.percent * 10000) / 100;
            var speed = parseInt(info.speed / 1024 / 1024 * 100) / 100;
            console.log('progress:' + percent + '%; speed:' + speed + 'Mb/s;');
        },
        onFileFinish: function (err, data, options) {
            console.log(options.Key + 'upload' + (err ? 'failed' : 'completed'));
        },
    }, function (err, data) {
        console.log(err || data);
    });
    

    Parameter description

    Parameter Description Type Required
    files File list. Each item is a parameter object to be passed to putObject and sliceUploadFile. Object Yes
    - Bucket Bucket name in the format of BucketName-APPID. String Yes
    Region Bucket region. For the enumerated values, please see Regions and Access Endpoints. String Yes
    - Key Object key (object name), the unique identifier of an object in a bucket. For more information, please see Object Overview. String Yes
    - Body Content of the file part to be uploaded. This parameter can be a File object, or a Blob object. File\Blob Yes
    SliceSize Specifies the minimum file size (in bytes) to use multipart upload. If the file size is equal to or smaller than this value, the file will be uploaded using putObject; otherwise, it will be uploaded using sliceUploadFile. Number Yes
    onProgress Upload progress calculated by averaging out the progress of all tasks String Yes
    - progressData.loaded Size of the uploaded parts, in bytes Number No
    - progressData.total Size of the entire object, in bytes Number No
    - progressData.speed Upload speed, in bytes/s Number No
    - progressData.percent Percentage of the file upload progress, in decimal form. For example, 0.5 means 50% has been uploaded. Number No
    onFileFinish The completion or error callback for each file String Yes
    - err Upload error message Object No
    - data Information about the completion of object upload Object No
    - options Parameter information about the files that have been uploaded Object No

    Callback function description

    function(err, data) { ... }
    
    Parameter Description Type
    err Object returned when an error (network error or service error) occurs. If the request is successful, this parameter is left empty. For more information, please see Error Codes. Object
    - statusCode HTTP status code returned by the request, such as 200, 403, and 404 Number
    - headers Headers returned by the request Object
    data Object returned when the request is successful. If the request fails, this parameter is left empty. Object
    - files error or data for each file ObjectArray
    - - error Upload error message Object
    - - data File upload completion information Object
    - - options Parameter information about files that have been uploaded Object

    Uploading queue

    The SDK for JavaScript records all the upload tasks initiated with putObject and sliceUploadFile in an upload queue. You can use the queue in the following ways:

    1. Use cos.getTaskList to get the task list.
    2. Use cos.pauseTask, cos.restartTask, and cos.cancelTask to perform operations on upload tasks.
    3. Use cos.on('list-update', callback); to monitor changes in the list and the upload progress.

    For a complete sample of how to use the upload queue, please see Queue Demo.

    Canceling an upload task

    This API cancels an upload task by taskId.

    Use case

    var taskId = 'xxxxx';                   /* Required */
    cos.cancelTask(taskId);
    

    Parameter description

    Parameter Description Type Required
    taskId ID of the upload task. When sliceUploadFile is called, TaskReady in the callback will return the taskId of the upload task. String Yes

    Suspending an upload task

    This API suspends an upload task by taskId.

    Use case

    var taskId = 'xxxxx';                   /* Required */
    cos.pauseTask(taskId);
    

    Parameter description

    Parameter Description Type Required
    taskId ID of the upload task. When sliceUploadFile is called, TaskReady in the callback will return the taskId of the upload task. String Yes

    Restarting an upload task

    This API is used to restart an upload task by taskId. You can restart tasks that have been manually suspended through the pauseTask API, or automatically suspended due to an upload error.

    Use case

    var taskId = 'xxxxx';                   /* Required */
    cos.restartTask(taskId);
    

    Parameter description

    Parameter Description Type Required
    taskId ID of the upload task. When sliceUploadFile is called, TaskReady in the callback will return the taskId of the upload task. String Yes

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