ListMultipartUploads - Amazon Simple Storage Service
Request SyntaxURI Request ParametersRequest BodyResponse SyntaxResponse ElementsExamplesSee Also

ListMultipartUploads

Important

End of support notice: Beginning October 1, 2025, Amazon S3 will stop returning DisplayName. Update your applications to use canonical IDs (unique identifier for AWS accounts), AWS account ID (12 digit identifier) or IAM ARNs (full resource naming) as a direct replacement of DisplayName.

Between July 1, 2025 and October 1, 2025, you will begin to see an increasing rate of missing DisplayName in the Owner object.

This change affects the following AWS Regions: US East (N. Virginia) Region, US West (N. California) Region, US West (Oregon) Region, Asia Pacific (Singapore) Region, Asia Pacific (Sydney) Region, Asia Pacific (Tokyo) Region, Europe (Ireland) Region, and South America (São Paulo) Region.

This operation lists in-progress multipart uploads in a bucket. An in-progress multipart upload is a multipart upload that has been initiated by the CreateMultipartUpload request, but has not yet been completed or aborted.

Note

Directory buckets - If multipart uploads in a directory bucket are in progress, you can't delete the bucket until all the in-progress multipart uploads are aborted or completed. To delete these in-progress multipart uploads, use the ListMultipartUploads operation to list the in-progress multipart uploads in the bucket and use the AbortMultipartUpload operation to abort all the in-progress multipart uploads.

The ListMultipartUploads operation returns a maximum of 1,000 multipart uploads in the response. The limit of 1,000 multipart uploads is also the default value. You can further limit the number of uploads in a response by specifying the max-uploads request parameter. If there are more than 1,000 multipart uploads that satisfy your ListMultipartUploads request, the response returns an IsTruncated element with the value of true, a NextKeyMarker element, and a NextUploadIdMarker element. To list the remaining multipart uploads, you need to make subsequent ListMultipartUploads requests. In these requests, include two query parameters: key-marker and upload-id-marker. Set the value of key-marker to the NextKeyMarker value from the previous response. Similarly, set the value of upload-id-marker to the NextUploadIdMarker value from the previous response.

Note

Directory buckets - The upload-id-marker element and the NextUploadIdMarker element aren't supported by directory buckets. To list the additional multipart uploads, you only need to set the value of key-marker to the NextKeyMarker value from the previous response.

For more information about multipart uploads, see Uploading Objects Using Multipart Upload in the Amazon S3 User Guide.

Note

Directory buckets - For directory buckets, you must make requests for this API operation to the Zonal endpoint. These endpoints support virtual-hosted-style requests in the format https://amzn-s3-demo-bucket.s3express-zone-id.region-code.amazonaws.com/key-name . Path-style requests are not supported. For more information about endpoints in Availability Zones, see Regional and Zonal endpoints for directory buckets in Availability Zones in the Amazon S3 User Guide. For more information about endpoints in Local Zones, see Concepts for directory buckets in Local Zones in the Amazon S3 User Guide.

Permissions

  • General purpose bucket permissions - For information about permissions required to use the multipart upload API, see Multipart Upload and Permissions in the Amazon S3 User Guide.

  • Directory bucket permissions - To grant access to this API operation on a directory bucket, we recommend that you use the CreateSession API operation for session-based authorization. Specifically, you grant the s3express:CreateSession permission to the directory bucket in a bucket policy or an IAM identity-based policy. Then, you make the CreateSession API call on the bucket to obtain a session token. With the session token in your request header, you can make API requests to this operation. After the session token expires, you make another CreateSession API call to generate a new session token for use. AWS CLI or SDKs create session and refresh the session token automatically to avoid service interruptions when a session expires. For more information about authorization, see CreateSession.

Sorting of multipart uploads in response

  • General purpose bucket - In the ListMultipartUploads response, the multipart uploads are sorted based on two criteria:

    • Key-based sorting - Multipart uploads are initially sorted in ascending order based on their object keys.

    • Time-based sorting - For uploads that share the same object key, they are further sorted in ascending order based on the upload initiation time. Among uploads with the same key, the one that was initiated first will appear before the ones that were initiated later.

  • Directory bucket - In the ListMultipartUploads response, the multipart uploads aren't sorted lexicographically based on the object keys.

HTTP Host header syntax

Directory buckets - The HTTP Host header syntax is Bucket-name.s3express-zone-id.region-code.amazonaws.com.

The following operations are related to ListMultipartUploads:

Request Syntax

GET /?uploads&delimiter=Delimiter&encoding-type=EncodingType&key-marker=KeyMarker&max-uploads=MaxUploads&prefix=Prefix&upload-id-marker=UploadIdMarker HTTP/1.1
Host: Bucket.s3.amazonaws.com
x-amz-expected-bucket-owner: ExpectedBucketOwner
x-amz-request-payer: RequestPayer

URI Request Parameters

The request uses the following URI parameters.

Bucket

The name of the bucket to which the multipart upload was initiated.

Directory buckets - When you use this operation with a directory bucket, you must use virtual-hosted-style requests in the format Bucket-name.s3express-zone-id.region-code.amazonaws.com. Path-style requests are not supported. Directory bucket names must be unique in the chosen Zone (Availability Zone or Local Zone). Bucket names must follow the format bucket-base-name--zone-id--x-s3 (for example, amzn-s3-demo-bucket--usw2-az1--x-s3). For information about bucket naming restrictions, see Directory bucket naming rules in the Amazon S3 User Guide.

Access points - When you use this action with an access point for general purpose buckets, you must provide the alias of the access point in place of the bucket name or specify the access point ARN. When you use this action with an access point for directory buckets, you must provide the access point name in place of the bucket name. When using the access point ARN, you must direct requests to the access point hostname. The access point hostname takes the form AccessPointName-AccountId.s3-accesspoint.Region.amazonaws.com. When using this action with an access point through the AWS SDKs, you provide the access point ARN in place of the bucket name. For more information about access point ARNs, see Using access points in the Amazon S3 User Guide.

Note

Object Lambda access points are not supported by directory buckets.

S3 on Outposts - When you use this action with S3 on Outposts, you must direct requests to the S3 on Outposts hostname. The S3 on Outposts hostname takes the form AccessPointName-AccountId.outpostID.s3-outposts.Region.amazonaws.com. When you use this action with S3 on Outposts, the destination bucket must be the Outposts access point ARN or the access point alias. For more information about S3 on Outposts, see What is S3 on Outposts? in the Amazon S3 User Guide.

Required: Yes

delimiter

Character you use to group keys.

All keys that contain the same string between the prefix, if specified, and the first occurrence of the delimiter after the prefix are grouped under a single result element, CommonPrefixes. If you don't specify the prefix parameter, then the substring starts at the beginning of the key. The keys that are grouped under CommonPrefixes result element are not returned elsewhere in the response.

Note

Directory buckets - For directory buckets, / is the only supported delimiter.

encoding-type

Encoding type used by Amazon S3 to encode the object keys in the response. Responses are encoded only in UTF-8. An object key can contain any Unicode character. However, the XML 1.0 parser can't parse certain characters, such as characters with an ASCII value from 0 to 10. For characters that aren't supported in XML 1.0, you can add this parameter to request that Amazon S3 encode the keys in the response. For more information about characters to avoid in object key names, see Object key naming guidelines.

Note

When using the URL encoding type, non-ASCII characters that are used in an object's key name will be percent-encoded according to UTF-8 code values. For example, the object test_file(3).png will appear as test_file%283%29.png.

Valid Values: url

key-marker

Specifies the multipart upload after which listing should begin.

Note

  • General purpose buckets - For general purpose buckets, key-marker is an object key. Together with upload-id-marker, this parameter specifies the multipart upload after which listing should begin.

    If upload-id-marker is not specified, only the keys lexicographically greater than the specified key-marker will be included in the list.

    If upload-id-marker is specified, any multipart uploads for a key equal to the key-marker might also be included, provided those multipart uploads have upload IDs lexicographically greater than the specified upload-id-marker.

  • Directory buckets - For directory buckets, key-marker is obfuscated and isn't a real object key. The upload-id-marker parameter isn't supported by directory buckets. To list the additional multipart uploads, you only need to set the value of key-marker to the NextKeyMarker value from the previous response.

    In the ListMultipartUploads response, the multipart uploads aren't sorted lexicographically based on the object keys.

max-uploads

Sets the maximum number of multipart uploads, from 1 to 1,000, to return in the response body. 1,000 is the maximum number of uploads that can be returned in a response.

prefix

Lists in-progress uploads only for those keys that begin with the specified prefix. You can use prefixes to separate a bucket into different grouping of keys. (You can think of using prefix to make groups in the same way that you'd use a folder in a file system.)

Note

Directory buckets - For directory buckets, only prefixes that end in a delimiter (/) are supported.

upload-id-marker

Together with key-marker, specifies the multipart upload after which listing should begin. If key-marker is not specified, the upload-id-marker parameter is ignored. Otherwise, any multipart uploads for a key equal to the key-marker might be included in the list only if they have an upload ID lexicographically greater than the specified upload-id-marker.

Note

This functionality is not supported for directory buckets.

x-amz-expected-bucket-owner

The account ID of the expected bucket owner. If the account ID that you provide does not match the actual owner of the bucket, the request fails with the HTTP status code 403 Forbidden (access denied).

x-amz-request-payer

Confirms that the requester knows that they will be charged for the request. Bucket owners need not specify this parameter in their requests. If either the source or destination S3 bucket has Requester Pays enabled, the requester will pay for corresponding charges to copy the object. For information about downloading objects from Requester Pays buckets, see Downloading Objects in Requester Pays Buckets in the Amazon S3 User Guide.

Note

This functionality is not supported for directory buckets.

Valid Values: requester

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 200
x-amz-request-charged: RequestCharged
<?xml version="1.0" encoding="UTF-8"?>
<ListMultipartUploadsResult>
   <Bucket>string</Bucket>
   <KeyMarker>string</KeyMarker>
   <UploadIdMarker>string</UploadIdMarker>
   <NextKeyMarker>string</NextKeyMarker>
   <Prefix>string</Prefix>
   <Delimiter>string</Delimiter>
   <NextUploadIdMarker>string</NextUploadIdMarker>
   <MaxUploads>integer</MaxUploads>
   <IsTruncated>boolean</IsTruncated>
   <Upload>
      <ChecksumAlgorithm>string</ChecksumAlgorithm>
      <ChecksumType>string</ChecksumType>
      <Initiated>timestamp</Initiated>
      <Initiator>
         <DisplayName>string</DisplayName>
         <ID>string</ID>
      </Initiator>
      <Key>string</Key>
      <Owner>
         <DisplayName>string</DisplayName>
         <ID>string</ID>
      </Owner>
      <StorageClass>string</StorageClass>
      <UploadId>string</UploadId>
   </Upload>
   ...
   <CommonPrefixes>
      <Prefix>string</Prefix>
   </CommonPrefixes>
   ...
   <EncodingType>string</EncodingType>
</ListMultipartUploadsResult>

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The response returns the following HTTP headers.

x-amz-request-charged

If present, indicates that the requester was successfully charged for the request. For more information, see Using Requester Pays buckets for storage transfers and usage in the Amazon Simple Storage Service user guide.

Note

This functionality is not supported for directory buckets.

Valid Values: requester

The following data is returned in XML format by the service.

ListMultipartUploadsResult

Root level tag for the ListMultipartUploadsResult parameters.

Required: Yes

Bucket

The name of the bucket to which the multipart upload was initiated. Does not return the access point ARN or access point alias if used.

Type: String

CommonPrefixes

If you specify a delimiter in the request, then the result returns each distinct key prefix containing the delimiter in a CommonPrefixes element. The distinct key prefixes are returned in the Prefix child element.

Note

Directory buckets - For directory buckets, only prefixes that end in a delimiter (/) are supported.

Type: Array of CommonPrefix data types

Delimiter

Contains the delimiter you specified in the request. If you don't specify a delimiter in your request, this element is absent from the response.

Note

Directory buckets - For directory buckets, / is the only supported delimiter.

Type: String

EncodingType

Encoding type used by Amazon S3 to encode object keys in the response.

If you specify the encoding-type request parameter, Amazon S3 includes this element in the response, and returns encoded key name values in the following response elements:

Delimiter, KeyMarker, Prefix, NextKeyMarker, Key.

Type: String

Valid Values: url

IsTruncated

Indicates whether the returned list of multipart uploads is truncated. A value of true indicates that the list was truncated. The list can be truncated if the number of multipart uploads exceeds the limit allowed or specified by max uploads.

Type: Boolean

KeyMarker

The key at or after which the listing began.

Type: String

MaxUploads

Maximum number of multipart uploads that could have been included in the response.

Type: Integer

NextKeyMarker

When a list is truncated, this element specifies the value that should be used for the key-marker request parameter in a subsequent request.

Type: String

NextUploadIdMarker

When a list is truncated, this element specifies the value that should be used for the upload-id-marker request parameter in a subsequent request.

Note

This functionality is not supported for directory buckets.

Type: String

Prefix

When a prefix is provided in the request, this field contains the specified prefix. The result contains only keys starting with the specified prefix.

Note

Directory buckets - For directory buckets, only prefixes that end in a delimiter (/) are supported.

Type: String

Upload

Container for elements related to a particular multipart upload. A response can contain zero or more Upload elements.

Type: Array of MultipartUpload data types

UploadIdMarker

Together with key-marker, specifies the multipart upload after which listing should begin. If key-marker is not specified, the upload-id-marker parameter is ignored. Otherwise, any multipart uploads for a key equal to the key-marker might be included in the list only if they have an upload ID lexicographically greater than the specified upload-id-marker.

Note

This functionality is not supported for directory buckets.

Type: String

Examples

Sample Request for general purpose buckets

The following request lists three multipart uploads. The request specifies the max-uploads request parameter to set the maximum number of multipart uploads to return in the response body.


GET /?uploads&max-uploads=3 HTTP/1.1
Host: example-bucket.s3.<Region>.amazonaws.com
Date: Mon, 1 Nov 2010 20:34:56 GMT
Authorization: authorization string

Sample Response for general purpose buckets

The following sample response indicates that the multipart upload list was truncated and provides the NextKeyMarker and the NextUploadIdMarker elements. You specify these values in your subsequent requests to read the next set of multipart uploads. That is, send a subsequent request specifying key-marker=my-movie2.m2ts (value of the NextKeyMarker element) and upload-id-marker=YW55IGlkZWEgd2h5IGVsdmluZydzIHVwbG9hZCBmYWlsZWQ (value of the NextUploadIdMarker).

The sample response also shows a case of two multipart uploads in progress with the same key (my-movie.m2ts). That is, the response shows two uploads with the same key. This response shows the uploads sorted by key, and within each key the uploads are sorted in ascending order by the time the multipart upload was initiated. 


HTTP/1.1 200 OK
x-amz-id-2: Uuag1LuByRx9e6j5Onimru9pO4ZVKnJ2Qz7/C1NPcfTWAtRPfTaOFg==
x-amz-request-id: 656c76696e6727732072657175657374
Date: Mon, 1 Nov 2010 20:34:56 GMT
Content-Length: 1330
Connection: keep-alive
Server: AmazonS3

<?xml version="1.0" encoding="UTF-8"?>
<ListMultipartUploadsResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
  <Bucket>bucket</Bucket>
  <KeyMarker></KeyMarker>
  <UploadIdMarker></UploadIdMarker>
  <NextKeyMarker>my-movie.m2ts</NextKeyMarker>
  <NextUploadIdMarker>YW55IGlkZWEgd2h5IGVsdmluZydzIHVwbG9hZCBmYWlsZWQ</NextUploadIdMarker>
  <MaxUploads>3</MaxUploads>
  <IsTruncated>true</IsTruncated>
  <Upload>
    <Key>my-divisor</Key>
    <UploadId>XMgbGlrZSBlbHZpbmcncyBub3QgaGF2aW5nIG11Y2ggbHVjaw</UploadId>
    <Initiator>
      <ID>arn:aws:iam::111122223333:user/user1-11111a31-17b5-4fb7-9df5-b111111f13de</ID>
      <DisplayName>user1-11111a31-17b5-4fb7-9df5-b111111f13de</DisplayName>
    </Initiator>
    <Owner>
      <ID>75aa57f09aa0c8caeab4f8c24e99d10f8e7faeebf76c078efc7c6caea54ba06a</ID>
      <DisplayName>OwnerDisplayName</DisplayName>
    </Owner>
    <StorageClass>STANDARD</StorageClass>
    <Initiated>2010-11-10T20:48:33.000Z</Initiated>  
  </Upload>
  <Upload>
    <Key>my-movie.m2ts</Key>
    <UploadId>VXBsb2FkIElEIGZvciBlbHZpbmcncyBteS1tb3ZpZS5tMnRzIHVwbG9hZA</UploadId>
    <Initiator>
      <ID>b1d16700c70b0b05597d7acd6a3f92be</ID>
      <DisplayName>InitiatorDisplayName</DisplayName>
    </Initiator>
    <Owner>
      <ID>b1d16700c70b0b05597d7acd6a3f92be</ID>
      <DisplayName>OwnerDisplayName</DisplayName>
    </Owner>
    <StorageClass>STANDARD</StorageClass>
    <Initiated>2010-11-10T20:48:33.000Z</Initiated>
  </Upload>
  <Upload>
    <Key>my-movie.m2ts</Key>
    <UploadId>YW55IGlkZWEgd2h5IGVsdmluZydzIHVwbG9hZCBmYWlsZWQ</UploadId>
    <Initiator>
      <ID>arn:aws:iam::444455556666:user/user1-22222a31-17b5-4fb7-9df5-b222222f13de</ID>
      <DisplayName>user1-22222a31-17b5-4fb7-9df5-b222222f13de</DisplayName>
    </Initiator>
    <Owner>
      <ID>b1d16700c70b0b05597d7acd6a3f92be</ID>
      <DisplayName>OwnerDisplayName</DisplayName>
    </Owner>
    <StorageClass>STANDARD</StorageClass>
    <Initiated>2010-11-10T20:49:33.000Z</Initiated>
  </Upload>
</ListMultipartUploadsResult>

Sample Request for general purpose buckets: Using the delimiter and the prefix parameters

Assume you have a multipart upload in progress for the following keys in your bucket, example-bucket.

  • photos/2006/January/sample.jpg

  • photos/2006/February/sample.jpg

  • photos/2006/March/sample.jpg

  • videos/2006/March/sample.wmv

  • sample.jpg

The following list multipart upload request specifies the delimiter parameter with value "/".


GET /?uploads&delimiter=/ HTTP/1.1
Host: example-bucket.s3.<Region>.amazonaws.com
Date: Mon, 1 Nov 2010 20:34:56 GMT
Authorization: authorization string

Sample Response for general purpose buckets

The following sample response lists multipart uploads on the specified bucket, example-bucket.

The response returns multipart upload for the sample.jpg key in an <Upload> element.

However, because all the other keys contain the specified delimiter, a distinct substring, from the beginning of the key to the first occurrence of the delimiter, from each of these keys is returned in a <CommonPrefixes> element. The key substrings, photos/ and videos/ in the <CommonPrefixes> element, indicate that there are one or more in-progress multipart uploads with these key prefixes.

This is a useful scenario if you use key prefixes for your objects to create a logical folder like structure. In this case, you can interpret the result as the folders photos/ and videos/ have one or more multipart uploads in progress.


<ListMultipartUploadsResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
  <Bucket>example-bucket</Bucket>
  <KeyMarker/>
  <UploadIdMarker/>
  <NextKeyMarker>sample.jpg</NextKeyMarker>
  <NextUploadIdMarker>Xgw4MJT6ZPAVxpY0SAuGN7q4uWJJM22ZYg1W99trdp4tpO88.PT6.MhO0w2E17eutfAvQfQWoajgE_W2gpcxQw--</NextUploadIdMarker>
  <Delimiter>/</Delimiter>
  <Prefix/>
  <MaxUploads>1000</MaxUploads>
  <IsTruncated>false</IsTruncated>
  <Upload>
    <Key>sample.jpg</Key>
    <UploadId>Agw4MJT6ZPAVxpY0SAuGN7q4uWJJM22ZYg1N99trdp4tpO88.PT6.MhO0w2E17eutfAvQfQWoajgE_W2gpcxQw--</UploadId>
    <Initiator>
      <ID>314133b66967d86f031c7249d1d9a80249109428335cd0ef1cdc487b4566cb1b</ID>
      <DisplayName>string</DisplayName>
    </Initiator>
    <Owner>
      <ID>314133b66967d86f031c7249d1d9a80249109428335cd0ef1cdc487b4566cb1b</ID>
      <DisplayName>string</DisplayName>
    </Owner>
    <StorageClass>STANDARD</StorageClass>
    <Initiated>2010-11-26T19:24:17.000Z</Initiated>
  </Upload>
  <CommonPrefixes>
    <Prefix>photos/</Prefix>
  </CommonPrefixes>
  <CommonPrefixes>
    <Prefix>videos/</Prefix>
  </CommonPrefixes>
  </ListMultipartUploadsResult>

Sample Request for general purpose buckets

In addition to the delimiter parameter, you can filter results by adding a prefix parameter as shown in the following request.


GET /?uploads&delimiter=/&prefix=photos/2006/ HTTP/1.1
Host: example-bucket.s3.<Region>.amazonaws.com
Date: Mon, 1 Nov 2010 20:34:56 GMT
Authorization: authorization string

Sample Response for general purpose buckets

In this case, the response will include only multipart uploads for keys that start with the specified prefix. The value returned in the <CommonPrefixes> element is a substring from the beginning of the key to the first occurrence of the specified delimiter after the prefix.


<?xml version="1.0" encoding="UTF-8"?>
<ListMultipartUploadsResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
  <Bucket>example-bucket</Bucket>
  <KeyMarker/>
  <UploadIdMarker/>
  <NextKeyMarker/>
  <NextUploadIdMarker/>
  <Delimiter>/</Delimiter>
  <Prefix>photos/2006/</Prefix>
  <MaxUploads>1000</MaxUploads>
  <IsTruncated>false</IsTruncated>
  <CommonPrefixes>
    <Prefix>photos/2006/February/</Prefix>
  </CommonPrefixes>
  <CommonPrefixes>
    <Prefix>photos/2006/January/</Prefix>
  </CommonPrefixes>
  <CommonPrefixes>
    <Prefix>photos/2006/March/</Prefix>
  </CommonPrefixes>
</ListMultipartUploadsResult>

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: