Example of Response.json() static method

json-worker.js

export default {
  async fetch(request) {
    return Response.json({
      date: Date(),
      headers: Object.fromEntries(request.headers),
      cf: request.cf      
    });
  },
};

Response: json() static method

People commonly call <response>.json() instance method to parse a json response body of a fetch() request.

But did you know that there is also a Response.json(data, [options]) static method which returns a new Response with your json-stringified data, and adds the content-type: application/json header?

For more details, see https://developer.mozilla.org/en-US/docs/Web/API/Response/json_static

Try it out yourself in the Cloudflare workers sandbox

Worker deployed to https://json.jldec.workers.dev/