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

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ListObjects

Returns some or all (up to 1000) 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. Be sure to design your application to parse the contents of the response and handle it appropriately.

Important

This API has been revised. We recommend that you use the newer version, ListObjectsV2, when developing applications. For backward compatibility, Amazon S3 continues to support ListObjects.

The following operations are related to ListObjects:

Request Syntax

GET /?Delimiter=Delimiter&EncodingType=EncodingType&Marker=Marker&MaxKeys=MaxKeys&Prefix=Prefix HTTP/1.1 Host: Bucket.s3.amazonaws.com x-amz-request-payer: RequestPayer

URI Request Parameters

The request requires the following URI parameters.

Bucket

The name of the bucket containing the objects.

delimiter

A delimiter is a character you use to group keys.

encoding-type

Requests Amazon S3 to encode the object keys in the response and specifies the encoding method to use. An object key may contain any Unicode character; however, XML 1.0 parser cannot parse some characters, such as characters with an ASCII value from 0 to 10. For characters that are not supported in XML 1.0, you can add this parameter to request that Amazon S3 encode the keys in the response.

Valid Values: url

marker

Specifies the key to start with when listing objects in a bucket.

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.

x-amz-request-payer

Confirms that the requester knows that she or he will be charged for the list objects request. 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"?> <ListObjectsOutput> <IsTruncated>boolean</IsTruncated> <Marker>string</Marker> <NextMarker>string</NextMarker> <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> </ListObjectsOutput>

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.

ListObjectsOutput

Root level tag for the ListObjectsOutput parameters.

Required: Yes

CommonPrefixes

All of the keys rolled up in 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 the 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

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 keys in the response.

Type: String

Valid Values: url

IsTruncated

A flag that indicates whether or not Amazon S3 returned all of the results that satisfied the search criteria.

Type: Boolean

Marker

Indicates where in the bucket listing begins. Marker is included in the response if it was sent with the request.

Type: String

MaxKeys

The maximum number of keys returned in the response body.

Type: Integer

Name

Name of the bucket.

Type: String

NextMarker

When response is truncated (the IsTruncated element value in the response is true), you can use the key name in this field as marker in the subsequent request to get next set of objects. Amazon S3 lists objects in alphabetical order Note: This element is returned only if you have delimiter request parameter specified. If response does not include the NextMaker and it is truncated, you can use the value of the last Key in the response as the marker in the subsequent request to get the next set of object keys.

Type: String

Prefix

Keys that begin with the indicated prefix.

Type: String

Examples

Sample Request

This request returns the objects in BucketName.

GET / HTTP/1.1 Host: BucketName.s3.amazonaws.com Date: Wed, 12 Oct 2009 17:50:00 GMT 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/> <Marker/> <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> <Owner> <ID>75aa57f09aa0c8caeab4f8c24e99d10f8e7faeebf76c078efc7c6caea54ba06a</ID> <DisplayName>mtd@amazon.com</DisplayName> </Owner> </Contents> <Contents> <Key>my-third-image.jpg</Key> <LastModified>2009-10-12T17:50:30.000Z</LastModified> <ETag>"1b2cf535f27731c974343645a3985328"</ETag> <Size>64994</Size> <StorageClass>STANDARD_IA</StorageClass> <Owner> <ID>75aa57f09aa0c8caeab4f8c24e99d10f8e7faeebf76c078efc7c6caea54ba06a</ID> <DisplayName>mtd@amazon.com</DisplayName> </Owner> </Contents> </ListBucketResult>

Sample Request Using Request Parameters

This example lists up to 40 keys in the quotes bucket that start with N and occur lexicographically after Ned.

GET /?prefix=N&marker=Ned&max-keys=40 HTTP/1.1 Host: quotes.s3.amazonaws.com Date: Wed, 01 Mar 2006 12:00:00 GMT Authorization: authorization string

Sample Response

HTTP/1.1 200 OK x-amz-id-2: gyB+3jRPnrkN98ZajxHXr3u7EFM67bNgSAxexeEHndCX/7GRnfTXxReKUQF28IfP x-amz-request-id: 3B3C7C725673C630 Date: Wed, 01 Mar 2006 12:00:00 GMT Content-Type: application/xml Content-Length: 302 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>N</Prefix> <Marker>Ned</Marker> <MaxKeys>40</MaxKeys> <IsTruncated>false</IsTruncated> <Contents> <Key>Nelson</Key> <LastModified>2006-01-01T12:00:00.000Z</LastModified> <ETag>"828ef3fdfa96f00ad9f27c383fc9ac7f"</ETag> <Size>5</Size> <StorageClass>STANDARD</StorageClass> <Owner> <ID>bcaf161ca5fb16fd081034f</ID> <DisplayName>webfile</DisplayName> </Owner> </Contents> <Contents> <Key>Neo</Key> <LastModified>2006-01-01T12:00:00.000Z</LastModified> <ETag>"828ef3fdfa96f00ad9f27c383fc9ac7f"</ETag> <Size>4</Size> <StorageClass>STANDARD</StorageClass> <Owner> <ID>bcaf1ffd86a5fb16fd081034f</ID> <DisplayName>webfile</DisplayName> </Owner> </Contents> </ListBucketResult>

Sample Request Using a Prefix and Delimiter

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 /?delimiter=/ HTTP/1.1 Host: example-bucket.s3.amazonaws.com Date: Wed, 01 Mar 2006 12:00:00 GMT 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 prefix value photos/ that is a substring from the beginning of these keys to the first occurrence of the specified delimiter.

<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"> <Name>example-bucket</Name> <Prefix></Prefix> <Marker></Marker> <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> <Owner> <ID>canonical-user-id</ID> <DisplayName>display-name</DisplayName> </Owner> <StorageClass>STANDARD</StorageClass> </Contents> <CommonPrefixes> <Prefix>photos/</Prefix> </CommonPrefixes> </ListBucketResult>

Sample Request

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

GET /?prefix=photos/2006/&delimiter=/ HTTP/1.1 Host: example-bucket.s3.amazonaws.com Date: Wed, 01 Mar 2006 12:00:00 GMT Authorization: authorization string

Sample Response

In response, Amazon S3 returns only the keys that start with the specified prefix. 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> <Marker></Marker> <MaxKeys>1000</MaxKeys> <Delimiter>/</Delimiter> <IsTruncated>false</IsTruncated> <CommonPrefixes> <Prefix>photos/2006/February/</Prefix> </CommonPrefixes> <CommonPrefixes> <Prefix>photos/2006/January/</Prefix> </CommonPrefixes> </ListBucketResult>

See Also

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