Read a parameter from POST body in Vercel Edge Functions

post.ts

// api/post.ts

export const config = {
  runtime: 'experimental-edge',
}

export default async (req: Request) => {
  if (req.method !== 'POST') {
    return new Response('Method not allowed', { status: 405 });
  }

  const result = await req.body.getReader().read();
  const body = JSON.parse(new TextDecoder().decode(result.value))

  return new Response(JSON.stringify({result: body.test}), {
    status: 200,
    headers: {
      'content-type': 'application/json',
    }
  })
}