# `simulateStreamingMiddleware()`

`simulateStreamingMiddleware` is a middleware function that simulates streaming behavior with responses from non-streaming language models. This is useful when you want to maintain a consistent streaming interface even when using models that only provide complete responses.

```ts
import { simulateStreamingMiddleware } from 'ai';

const middleware = simulateStreamingMiddleware();
```

## Import

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

## API Signature

### Parameters

This middleware doesn't accept any parameters.

### Returns

Returns a middleware object that:

- Takes a complete response from a language model
- Converts it into a simulated stream of chunks
- Properly handles various response components including:
  - Text content
  - Reasoning (as string or array of objects)
  - Tool calls
  - Metadata and usage information
  - Warnings

### Usage Example

```ts
import { streamText } from 'ai';
import { wrapLanguageModel } from 'ai';
import { simulateStreamingMiddleware } from 'ai';

// Example with a non-streaming model
const result = streamText({
  model: wrapLanguageModel({
    model: nonStreamingModel,
    middleware: simulateStreamingMiddleware(),
  }),
  prompt: 'Your prompt here',
});

// Now you can use the streaming interface
for await (const chunk of result.fullStream) {
  // Process streaming chunks
}
```

## How It Works

The middleware:

1. Awaits the complete response from the language model
2. Creates a `ReadableStream` that emits chunks in the correct sequence
3. Simulates streaming by breaking down the response into appropriate chunk types
4. Preserves all metadata, reasoning, tool calls, and other response properties


## Navigation

- [generateText](/v5/docs/reference/ai-sdk-core/generate-text)
- [streamText](/v5/docs/reference/ai-sdk-core/stream-text)
- [generateObject](/v5/docs/reference/ai-sdk-core/generate-object)
- [streamObject](/v5/docs/reference/ai-sdk-core/stream-object)
- [embed](/v5/docs/reference/ai-sdk-core/embed)
- [embedMany](/v5/docs/reference/ai-sdk-core/embed-many)
- [generateImage](/v5/docs/reference/ai-sdk-core/generate-image)
- [transcribe](/v5/docs/reference/ai-sdk-core/transcribe)
- [generateSpeech](/v5/docs/reference/ai-sdk-core/generate-speech)
- [tool](/v5/docs/reference/ai-sdk-core/tool)
- [dynamicTool](/v5/docs/reference/ai-sdk-core/dynamic-tool)
- [experimental_createMCPClient](/v5/docs/reference/ai-sdk-core/create-mcp-client)
- [Experimental_StdioMCPTransport](/v5/docs/reference/ai-sdk-core/mcp-stdio-transport)
- [jsonSchema](/v5/docs/reference/ai-sdk-core/json-schema)
- [zodSchema](/v5/docs/reference/ai-sdk-core/zod-schema)
- [valibotSchema](/v5/docs/reference/ai-sdk-core/valibot-schema)
- [ModelMessage](/v5/docs/reference/ai-sdk-core/model-message)
- [UIMessage](/v5/docs/reference/ai-sdk-core/ui-message)
- [validateUIMessages](/v5/docs/reference/ai-sdk-core/validate-ui-messages)
- [safeValidateUIMessages](/v5/docs/reference/ai-sdk-core/safe-validate-ui-messages)
- [createProviderRegistry](/v5/docs/reference/ai-sdk-core/provider-registry)
- [customProvider](/v5/docs/reference/ai-sdk-core/custom-provider)
- [cosineSimilarity](/v5/docs/reference/ai-sdk-core/cosine-similarity)
- [wrapLanguageModel](/v5/docs/reference/ai-sdk-core/wrap-language-model)
- [LanguageModelV2Middleware](/v5/docs/reference/ai-sdk-core/language-model-v2-middleware)
- [extractReasoningMiddleware](/v5/docs/reference/ai-sdk-core/extract-reasoning-middleware)
- [simulateStreamingMiddleware](/v5/docs/reference/ai-sdk-core/simulate-streaming-middleware)
- [defaultSettingsMiddleware](/v5/docs/reference/ai-sdk-core/default-settings-middleware)
- [stepCountIs](/v5/docs/reference/ai-sdk-core/step-count-is)
- [hasToolCall](/v5/docs/reference/ai-sdk-core/has-tool-call)
- [simulateReadableStream](/v5/docs/reference/ai-sdk-core/simulate-readable-stream)
- [smoothStream](/v5/docs/reference/ai-sdk-core/smooth-stream)
- [generateId](/v5/docs/reference/ai-sdk-core/generate-id)
- [createIdGenerator](/v5/docs/reference/ai-sdk-core/create-id-generator)


[Full Sitemap](/sitemap.md)