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  1. Products
  2. Workers
  3. Examples
  4. Accessing the Cloudflare Object

Accessing the Cloudflare Object

Try in Workers Playground
Access custom Cloudflare properties and control how Cloudflare features are applied to every request.
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export default {
  async fetch(req) {
    const data =
      req.cf !== undefined
        ? req.cf
        : { error: "The `cf` object is not available inside the preview." };


    return new Response(JSON.stringify(data, null, 2), {
      headers: {
        "content-type": "application/json;charset=UTF-8",
      },
    });
  },

};

export default {
  async fetch(req): Promise<Response> {
    const data =
      req.cf !== undefined
        ? req.cf
        : { error: "The `cf` object is not available inside the preview." };


    return new Response(JSON.stringify(data, null, 2), {
      headers: {
        "content-type": "application/json;charset=UTF-8",
      },
    });
  },

} satisfies ExportedHandler;

import json
from js import Response, Headers, JSON


def on_fetch(request):
    error = json.dumps({ "error": "The `cf` object is not available inside the preview." })
    data = request.cf if request.cf is not None else error
    headers = Headers.new({"content-type":"application/json"}.items())
    return Response.new(JSON.stringify(data, None, 2), headers=headers)