---
title: AWSBedrockAnthropicMessagesStream
description: Learn to use AWSBedrockAnthropicMessagesStream helper function in your application.
---

# `AWSBedrockAnthropicMessagesStream`

<Note type="warning">
  AWSBedrockAnthropicMessagesStream has been removed in AI SDK 4.0.
</Note>

<Note type="warning">
  AWSBedrockAnthropicMessagesStream is part of the legacy AWS Bedrock
  integration. It is not compatible with the AI SDK 3.1 functions.
</Note>

The AWS Bedrock stream functions are utilties that transform the outputs from the AWS Bedrock API into a ReadableStream. It uses AIStream under the hood and handle parsing Bedrock's response.

## Import

### React

<Snippet
  text={`import { AWSBedrockAnthropicMessagesStream } from "ai"`}
  prompt={false}
/>

## API Signature

### Parameters

<PropertiesTable
  content={[
    {
      name: 'response',
      type: 'AWSBedrockResponse',
      description: 'The response object returned from AWS Bedrock.',
      properties: [
        {
          type: 'AWSBedrockResponse',
          parameters: [
            {
              name: 'body',
              isOptional: true,
              type: 'AsyncIterable<{ chunk?: { bytes?: Uint8Array } }>',
              description:
                'An optional async iterable of objects containing optional binary data chunks.',
            },
          ],
        },
      ],
    },
    {
      name: 'callbacks',
      type: 'AIStreamCallbacksAndOptions',
      isOptional: true,
      description:
        'An object containing callback functions to handle the start, each token, and completion of the AI response. In the absence of this parameter, default behavior is implemented.',
      properties: [
        {
          type: 'AIStreamCallbacksAndOptions',
          parameters: [
            {
              name: 'onStart',
              type: '() => Promise<void>',
              description:
                'An optional function that is called at the start of the stream processing.',
            },
            {
              name: 'onCompletion',
              type: '(completion: string) => Promise<void>',
              description:
                "An optional function that is called for every completion. It's passed the completion as a string.",
            },
            {
              name: 'onFinal',
              type: '(completion: string) => Promise<void>',
              description:
                'An optional function that is called once when the stream is closed with the final completion message.',
            },
            {
              name: 'onToken',
              type: '(token: string) => Promise<void>',
              description:
                "An optional function that is called for each token in the stream. It's passed the token as a string.",
            },
          ],
        },
      ],
    },
  ]}
/>

### Returns

A `ReadableStream`.
