Amazon Simple Storage Service
API Reference (API Version 2006-03-01)

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ListObjectsV2

Returns some or all (up to 1,000) of the objects in a bucket. You can use the request parameters as selection criteria to return a subset of the objects in a bucket. A 200 OK response can contain valid or invalid XML. Make sure to design your application to parse the contents of the response and handle it appropriately.

To use thisoperation, you must have READ access to the bucket.

To use this operation in an AWS Identity and Access Management (IAM) policy, you must have permissions to perform the s3:ListBucket action. The bucket owner has this permission by default and can grant this permission to others. For more information about permissions, see Permissions Related to Bucket Subresource Operations and Managing Access Permissions to Your Amazon S3 Resources.

Important

This section describes the latest revision of the API. We recommend that you use this revised API for application development. For backward compatibility, Amazon S3 continues to support the prior version of this API, ListObjects.

To get a list of your buckets, see ListBuckets.

The following operations are related to ListObjectsV2:

Request Syntax

GET /?list-type=2&ContinuationToken=ContinuationToken&Delimiter=Delimiter&EncodingType=EncodingType&FetchOwner=FetchOwner&MaxKeys=MaxKeys&Prefix=Prefix&StartAfter=StartAfter HTTP/1.1 Host: Bucket.s3.amazonaws.com x-amz-request-payer: RequestPayer

URI Request Parameters

The request requires the following URI parameters.

Bucket

Name of the bucket to list.

continuation-token

ContinuationToken indicates Amazon S3 that the list is being continued on this bucket with a token. ContinuationToken is obfuscated and is not a real key.

delimiter

A delimiter is a character you use to group keys.

encoding-type

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

Valid Values: url

fetch-owner

The owner field is not present in listV2 by default, if you want to return owner field with each key in the result then set the fetch owner field to true

max-keys

Sets the maximum number of keys returned in the response. The response might contain fewer keys but will never contain more.

prefix

Limits the response to keys that begin with the specified prefix.

start-after

StartAfter is where you want Amazon S3 to start listing from. Amazon S3 starts listing after this specified key. StartAfter can be any key in the bucket.

x-amz-request-payer

Confirms that the requester knows that she or he will be charged for the list objects request in V2 style. Bucket owners need not specify this parameter in their requests.

Valid Values: requester

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 200 <?xml version="1.0" encoding="UTF-8"?> <ListObjectsV2Output> <IsTruncated>boolean</IsTruncated> <Contents> <ETag>string</ETag> <Key>string</Key> <LastModified>timestamp</LastModified> <Owner> <DisplayName>string</DisplayName> <ID>string</ID> </Owner> <Size>integer</Size> <StorageClass>string</StorageClass> </Contents> ... <Name>string</Name> <Prefix>string</Prefix> <Delimiter>string</Delimiter> <MaxKeys>integer</MaxKeys> <CommonPrefixes> <Prefix>string</Prefix> </CommonPrefixes> ... <EncodingType>string</EncodingType> <KeyCount>integer</KeyCount> <ContinuationToken>string</ContinuationToken> <NextContinuationToken>string</NextContinuationToken> <StartAfter>string</StartAfter> </ListObjectsV2Output>

Response Elements

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

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

ListObjectsV2Output

Root level tag for the ListObjectsV2Output parameters.

Required: Yes

CommonPrefixes

All of the keys rolled up into a common prefix count as a single return when calculating the number of returns.

A response can contain CommonPrefixes only if you specify a delimiter.

CommonPrefixes contains all (if there are any) keys between Prefix and the next occurrence of the string specified by a delimiter.

CommonPrefixes lists keys that act like subdirectories in the directory specified by Prefix.

For example, if the prefix is notes/ and the delimiter is a slash (/) as in notes/summer/july, the common prefix is notes/summer/. All of the keys that roll up into a common prefix count as a single return when calculating the number of returns.

Type: Array of CommonPrefix data types

Contents

Metadata about each object returned.

Type: Array of Object data types

ContinuationToken

If ContinuationToken was sent with the request, it is included in the response.

Type: String

Delimiter

Causes keys that contain the same string between the prefix and the first occurrence of the delimiter to be rolled up into a single result element in the CommonPrefixes collection. These rolled-up keys are not returned elsewhere in the response. Each rolled-up result counts as only one return against the MaxKeys value.

Type: String

EncodingType

Encoding type used by Amazon S3 to encode object key names in the XML 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, Prefix, Key, and StartAfter.

Type: String

Valid Values: url

IsTruncated

Set to false if all of the results were returned. Set to true if more keys are available to return. If the number of results exceeds that specified by MaxKeys, all of the results might not be returned.

Type: Boolean

KeyCount

KeyCount is the number of keys returned with this request. KeyCount will always be less than equals to MaxKeys field. Say you ask for 50 keys, your result will include less than equals 50 keys

Type: Integer

MaxKeys

Sets the maximum number of keys returned in the response. The response might contain fewer keys but will never contain more.

Type: Integer

Name

Name of the bucket.

Type: String

NextContinuationToken

NextContinuationToken is sent when isTruncated is true which means there are more keys in the bucket that can be listed. The next list requests to Amazon S3 can be continued with this NextContinuationToken. NextContinuationToken is obfuscated and is not a real key

Type: String

Prefix

Keys that begin with the indicated prefix.

Type: String

StartAfter

If StartAfter was sent with the request, it is included in the response.

Type: String

Examples

Sample Request: Listing Keys

This request returns the objects in BucketName. The request specifies the list-type parameter, which indicates version 2 of the API.

GET /?list-type=2 HTTP/1.1 Host: bucket.s3.amazonaws.com x-amz-date: 20160430T233541Z Authorization: authorization string Content-Type: text/plain

Sample Response

<?xml version="1.0" encoding="UTF-8"?> <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"> <Name>bucket</Name> <Prefix/> <KeyCount>205</KeyCount> <MaxKeys>1000</MaxKeys> <IsTruncated>false</IsTruncated> <Contents> <Key>my-image.jpg</Key> <LastModified>2009-10-12T17:50:30.000Z</LastModified> <ETag>"fba9dede5f27731c9771645a39863328"</ETag> <Size>434234</Size> <StorageClass>STANDARD</StorageClass> </Contents> <Contents> ... </Contents> ... </ListBucketResult>

Sample Request: Listing Keys Using the max-keys, prefix, and start-after Parameters

In addition to the list-type parameter that indicates version 2 of the API, the request also specifies additional parameters to retrieve up to three keys in the quotes bucket that start with E and occur lexicographically after ExampleGuide.pdf.

GET /?list-type=2&max-keys=3&prefix=E&start-after=ExampleGuide.pdf HTTP/1.1 Host: quotes.s3.amazonaws.com x-amz-date: 20160430T232933Z Authorization: authorization string

Sample Response

HTTP/1.1 200 OK x-amz-id-2: gyB+3jRPnrkN98ZajxHXr3u7EFM67bNgSAxexeEHndCX/7GRnfTXxReKUQF28IfP x-amz-request-id: 3B3C7C725673C630 Date: Sat, 30 Apr 2016 23:29:37 GMT Content-Type: application/xml Content-Length: length Connection: close Server: AmazonS3 <?xml version="1.0" encoding="UTF-8"?> <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"> <Name>quotes</Name> <Prefix>E</Prefix> <StartAfter>ExampleGuide.pdf</StartAfter> <KeyCount>1</KeyCount> <MaxKeys>3</MaxKeys> <IsTruncated>false</IsTruncated> <Contents> <Key>ExampleObject.txt</Key> <LastModified>2013-09-17T18:07:53.000Z</LastModified> <ETag>"599bab3ed2c697f1d26842727561fd94"</ETag> <Size>857</Size> <StorageClass>REDUCED_REDUNDANCY</StorageClass> </Contents> </ListBucketResult>

Sample Request: Listing Keys Using the prefix and delimiter Parameters

This example illustrates the use of the prefix and the delimiter parameters in the request. For this example, we assume that you have the following keys in your bucket:

  • sample.jpg

  • photos/2006/January/sample.jpg

  • photos/2006/February/sample2.jpg

  • photos/2006/February/sample3.jpg

  • photos/2006/February/sample4.jpg

The following GET request specifies the delimiter parameter with value /.

GET /?list-type=2&delimiter=/ HTTP/1.1 Host: example-bucket.s3.amazonaws.com x-amz-date: 20160430T235931Z Authorization: authorization string

Sample Response

The key sample.jpg does not contain the delimiter character, and Amazon S3 returns it in the Contents element in the response. However, all other keys contain the delimiter character. Amazon S3 groups these keys and returns a single CommonPrefixes element with the prefix value photos/. The element is a substring that starts at the beginning of these keys and ends at the first occurrence of the specified delimiter.

<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"> <Name>example-bucket</Name> <Prefix></Prefix> <KeyCount>2</KeyCount> <MaxKeys>1000</MaxKeys> <Delimiter>/</Delimiter> <IsTruncated>false</IsTruncated> <Contents> <Key>sample.jpg</Key> <LastModified>2011-02-26T01:56:20.000Z</LastModified> <ETag>"bf1d737a4d46a19f3bced6905cc8b902"</ETag> <Size>142863</Size> <StorageClass>STANDARD</StorageClass> </Contents> <CommonPrefixes> <Prefix>photos/</Prefix> </CommonPrefixes> </ListBucketResult>

Sample Request

The following request specifies the delimiter parameter with value /, and the prefix parameter with value photos/2006/.

GET /?list-type=2&prefix=photos/2006/&delimiter=/ HTTP/1.1 Host: example-bucket.s3.amazonaws.com x-amz-date: 20160501T000433Z Authorization: authorization string

Sample Response

In response, Amazon S3 returns only the keys that start with the specified prefix. Further, it uses the delimiter character to group keys that contain the same substring until the first occurrence of the delimiter character after the specified prefix. For each such key group Amazon S3 returns one CommonPrefixes element in the response. The keys grouped under this CommonPrefixes element are not returned elsewhere in the response. The value returned in the CommonPrefixes element is a substring that starts at the beginning of the key and ends at the first occurrence of the specified delimiter after the prefix.

<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"> <Name>example-bucket</Name> <Prefix>photos/2006/</Prefix> <KeyCount>3</KeyCount> <MaxKeys>1000</MaxKeys> <Delimiter>/</Delimiter> <IsTruncated>false</IsTruncated> <Contents> <Key>photos/2006/</Key> <LastModified>2016-04-30T23:51:29.000Z</LastModified> <ETag>"d41d8cd98f00b204e9800998ecf8427e"</ETag> <Size>0</Size> <StorageClass>STANDARD</StorageClass> </Contents> <CommonPrefixes> <Prefix>photos/2006/February/</Prefix> </CommonPrefixes> <CommonPrefixes> <Prefix>photos/2006/January/</Prefix> </CommonPrefixes> </ListBucketResult>

Sample Request: Using a Continuation Token

In this example, the initial request returns more than 1,000 keys. In response to this request, Amazon S3 returns the IsTruncated element with the value set to true and with a NextContinuationToken element.

GET /?list-type=2 HTTP/1.1 Host: bucket.s3.amazonaws.com Date: Mon, 02 May 2016 23:17:07 GMT Authorization: authorization string

Sample Response: Using a Continuation Token

HTTP/1.1 200 OK x-amz-id-2: gyB+3jRPnrkN98ZajxHXr3u7EFM67bNgSAxexeEHndCX/7GRnfTXxReKUQF28IfP x-amz-request-id: 3B3C7C725673C630 Date: Sat, 30 Apr 2016 23:29:37 GMT Content-Type: application/xml Content-Length: length Connection: close Server: AmazonS3 <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"> <Name>bucket</Name> <Prefix></Prefix> <NextContinuationToken>1ueGcxLPRx1Tr/XYExHnhbYLgveDs2J/wm36Hy4vbOwM=</NextContinuationToken> <KeyCount>1000</KeyCount> <MaxKeys>1000</MaxKeys> <IsTruncated>true</IsTruncated> <Contents> <Key>happyface.jpg</Key> <LastModified>2014-11-21T19:40:05.000Z</LastModified> <ETag>"70ee1738b6b21e2c8a43f3a5ab0eee71"</ETag> <Size>11</Size> <StorageClass>STANDARD</StorageClass> </Contents> ... </ListBucketResult>

In the following subsequent request, we include a continuation-token query parameter in the request with value of the <NextContinuationToken> from the preceding response.

GET /?list-type=2 HTTP/1.1 GET /?list-type=2&continuation-token=1ueGcxLPRx1Tr/XYExHnhbYLgveDs2J/wm36Hy4vbOwM= HTTP/1.1 Host: bucket.s3.amazonaws.com Date: Mon, 02 May 2016 23:17:07 GMT Authorization: authorization string

Amazon S3 returns a list of the next set of keys starting where the previous request ended.

HTTP/1.1 200 OK x-amz-id-2: gyB+3jRPnrkN98ZajxHXr3u7EFM67bNgSAxexeEHndCX/7GRnfTXxReKUQF28IfP x-amz-request-id: 3B3C7C725673C630 Date: Sat, 30 Apr 2016 23:29:37 GMT Content-Type: application/xml Content-Length: length Connection: close Server: AmazonS3 <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"> <Name>bucket</Name> <Prefix></Prefix> <ContinuationToken>1ueGcxLPRx1Tr/XYExHnhbYLgveDs2J/wm36Hy4vbOwM=</ContinuationToken> <KeyCount>112</KeyCount> <MaxKeys>1000</MaxKeys> <IsTruncated>false</IsTruncated> <Contents> <Key>happyfacex.jpg</Key> <LastModified>2014-11-21T19:40:05.000Z</LastModified> <ETag>"70ee1738b6b21e2c8a43f3a5ab0eee71"</ETag> <Size>1111</Size> <StorageClass>STANDARD</StorageClass> </Contents> ... </ListBucketResult>

See Also

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