title: @ai-sdk/llamaindex Adapter description: API Reference for the LlamaIndex Adapter.

`@ai-sdk/llamaindex`

The @ai-sdk/llamaindex package provides helper functions to transform LlamaIndex output streams into data streams and data stream responses. See the LlamaIndex Adapter documentation for more information.

It supports:

LlamaIndex ChatEngine streams
LlamaIndex QueryEngine streams

Import

import { toDataResponse } from "@ai-sdk/llamaindex"

API Signature

Methods

toDataStream:

(stream: AsyncIterable<EngineResponse>, AIStreamCallbacksAndOptions) => AIStream

Converts LlamaIndex output streams to data stream.

toDataStreamResponse:

(stream: AsyncIterable<EngineResponse>, options?: {init?: ResponseInit, data?: StreamData, callbacks?: AIStreamCallbacksAndOptions}) => Response

Converts LlamaIndex output streams to data stream response.

mergeIntoDataStream:

(stream: AsyncIterable<EngineResponse>, options: { dataStream: DataStreamWriter; callbacks?: StreamCallbacks }) => void

Merges LlamaIndex output streams into an existing data stream.

Examples

Convert LlamaIndex ChatEngine Stream

app/api/completion/route.ts

import { OpenAI, SimpleChatEngine } from 'llamaindex';
import { toDataStreamResponse } from '@ai-sdk/llamaindex';

export async function POST(req: Request) {
  const { prompt } = await req.json();

  const llm = new OpenAI({ model: 'gpt-4o' });
  const chatEngine = new SimpleChatEngine({ llm });

  const stream = await chatEngine.chat({
    message: prompt,
    stream: true,
  });

  return toDataStreamResponse(stream);
}