That’s not how you handle route handlers. Request body json should be consumed by req.json() https://nextjs.org/docs/app/building-your-application/routing/route-handlers#request-body

Route handlers do not follow the syntax of api routes (so it’s not (req, res) like api routes, your res.status… won’t work), please check the route handler documentation page and read it carefully. It’s not just moving from a default export to per-method named exports, it’s a lot more than that

what about setHeader ?

well thanks sure i need to re-read the docs

The follow the native response way,

export async function GET(request: Request) {
  return new Response('Hello, Next.js!', {
    status: 200,
    headers: {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
      'Access-Control-Allow-Headers': 'Content-Type, Authorization',
    },
  })
}

dumb me, thank you very much @joulev