Amazon Textract
Developer Guide

GetDocumentAnalysis

Gets the results for an Amazon Textract asynchronous operation that analyzes text in a document.

You start asynchronous text analysis by calling StartDocumentAnalysis, which returns a job identifier (JobId). When the text analysis operation finishes, Amazon Textract publishes a completion status to the Amazon Simple Notification Service (Amazon SNS) topic that's registered in the initial call to StartDocumentAnalysis. To get the results of the text-detection operation, first check that the status value published to the Amazon SNS topic is SUCCEEDED. If so, call GetDocumentAnalysis, and pass the job identifier (JobId) from the initial call to StartDocumentAnalysis.

GetDocumentAnalysis returns an array of Block objects. The following types of information are returned:

  • Form data (key-value pairs). The related information is returned in two Block objects, each of type KEY_VALUE_SET: a KEY Block object and a VALUE Block object. For example, Name: Ana Silva Carolina contains a key and value. Name: is the key. Ana Silva Carolina is the value.

  • Table and table cell data. A TABLE Block object contains information about a detected table. A CELL Block object is returned for each cell in a table.

  • Lines and words of text. A LINE Block object contains one or more WORD Block objects. All lines and words that are detected in the document are returned (including text that doesn't have a relationship with the value of the StartDocumentAnalysis FeatureTypes input parameter).

Selection elements such as check boxes and option buttons (radio buttons) can be detected in form data and in tables. A SELECTION_ELEMENT Block object contains information about a selection element, including the selection status.

Use the MaxResults parameter to limit the number of blocks that are returned. If there are more results than specified in MaxResults, the value of NextToken in the operation response contains a pagination token for getting the next set of results. To get the next page of results, call GetDocumentAnalysis, and populate the NextToken request parameter with the token value that's returned from the previous call to GetDocumentAnalysis.

For more information, see Document Text Analysis.

Request Syntax

{ "JobId": "string", "MaxResults": number, "NextToken": "string" }

Request Parameters

The request accepts the following data in JSON format.

JobId

A unique identifier for the text-detection job. The JobId is returned from StartDocumentAnalysis.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 64.

Pattern: ^[a-zA-Z0-9-_]+$

Required: Yes

MaxResults

The maximum number of results to return per paginated call. The largest value that you can specify is 1,000. If you specify a value greater than 1,000, a maximum of 1,000 results is returned. The default value is 1,000.

Type: Integer

Valid Range: Minimum value of 1.

Required: No

NextToken

If the previous response was incomplete (because there are more blocks to retrieve), Amazon Textract returns a pagination token in the response. You can use this pagination token to retrieve the next set of blocks.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 255.

Pattern: .*\S.*

Required: No

Response Syntax

{ "Blocks": [ { "BlockType": "string", "ColumnIndex": number, "ColumnSpan": number, "Confidence": number, "EntityTypes": [ "string" ], "Geometry": { "BoundingBox": { "Height": number, "Left": number, "Top": number, "Width": number }, "Polygon": [ { "X": number, "Y": number } ] }, "Id": "string", "Page": number, "Relationships": [ { "Ids": [ "string" ], "Type": "string" } ], "RowIndex": number, "RowSpan": number, "SelectionStatus": "string", "Text": "string" } ], "DocumentMetadata": { "Pages": number }, "JobStatus": "string", "NextToken": "string", "StatusMessage": "string", "Warnings": [ { "ErrorCode": "string", "Pages": [ number ] } ] }

Response Elements

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

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

Blocks

The results of the text-analysis operation.

Type: Array of Block objects

DocumentMetadata

Information about a document that Amazon Textract processed. DocumentMetadata is returned in every page of paginated responses from an Amazon Textract video operation.

Type: DocumentMetadata object

JobStatus

The current status of the text detection job.

Type: String

Valid Values: IN_PROGRESS | SUCCEEDED | FAILED | PARTIAL_SUCCESS

NextToken

If the response is truncated, Amazon Textract returns this token. You can use this token in the subsequent request to retrieve the next set of text detection results.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 255.

Pattern: .*\S.*

StatusMessage

The current status of an asynchronous document-analysis operation.

Type: String

Warnings

A list of warnings that occurred during the document-analysis operation.

Type: Array of Warning objects

Errors

AccessDeniedException

You aren't authorized to perform the action.

HTTP Status Code: 400

InternalServerError

Amazon Textract experienced a service issue. Try your call again.

HTTP Status Code: 500

InvalidJobIdException

An invalid job identifier was passed to GetDocumentAnalysis or to GetDocumentAnalysis.

HTTP Status Code: 400

InvalidParameterException

An input parameter violated a constraint. For example, in synchronous operations, an InvalidParameterException exception occurs when neither of the S3Object or Bytes values are supplied in the Document request parameter. Validate your parameter before calling the API operation again.

HTTP Status Code: 400

ProvisionedThroughputExceededException

The number of requests exceeded your throughput limit. If you want to increase this limit, contact Amazon Textract.

HTTP Status Code: 400

ThrottlingException

Amazon Textract is temporarily unable to process the request. Try your call again.

HTTP Status Code: 500

See Also

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