Next.js · Middle · Question 67 of 75

How do you stream a response gradually from a Route Handler (e.g. AI tokens)?

export async function GET() {
  const stream = new ReadableStream({
    async start(controller) {
      for await (const chunk of tokens()) controller.enqueue(chunk)
      controller.close()
    },
  })
  return new Response(stream)
}

• ✓Correct answer: Return a Response whose body is a ReadableStream
• 2Call res.write() like in Express
• 3Streaming works only with the Edge runtime