A Cloudflare Worker to extract POST data submitted as either JSON or as a form.

sample-cloudflare-worker-post-processor.js

addEventListener("fetch", (event) => {
  event.respondWith(handleRequest(event.request).catch((err) => new Response(err.stack, {status: 500})));
});

async function handleRequest(request) {
	const {pathname} = new URL(request.url);
	if (pathname.startsWith("/api/post")) {
	  const {data, error} = await getPostData(request);
	  if (error) {
		 return new Response(error, {status: 400})
	  }
	  return new Response(JSON.stringify(data), {
		 headers: {
			"Content-Type": "application/json"
		 },
		 status: 200
	  });
	}
	
	return new Response("Not found", {status: 404});
 }

async function getPostData(request) {
  const response = {
    data: null,
    error: null
  }

  try {
    const {headers} = request;
    const contentType = headers.get("content-type") || "";

	 if (contentType.includes("application/json")) {
      response.data = await request.json();
      return response;
    }

	 if (contentType.includes("form")) {
      const formData = await request.formData();
      const body = {};
      for (const entry of formData.entries()) {
        body[entry[0]] = entry[1];
      }

      response.data = body
      return response;
    }

	 response.error = "Content-type must be application/json, application/x-www-form-urlencoded, or multipart/form-data"
    return response;
  } catch (e) {
    console.log(`ERROR: getPostData -> exception -> ${
      e.message
    }`);

	 response.error = "request failed";
    return response;
  }
}