How do I get the raw body of a Serverless Function?

You can use Vercel Serverless Functions to recieve webhooks from third-party services like Stripe. Certain providers require access to the raw body inside the function to validate the signature from the request.

export async function POST(request: Request) {
  const rawBody = await request.text()
  return Response.json({ rawBody })
}

You can verify your function can accept and parse raw bodies locally:

1. Start your local development server with vercel dev (or next dev).
2. In another terminal window, run the cURL command below.

curl -X POST -H "Content-Type: text/plain" --data "This is raw data" http://localhost:3000/api/test

You should see a response like {"rawBody": "This is raw data"}.