Cookie parsing

Given the cookie name, get the value of a cookie. You can also use cookies for A/B testing.

Last updated Sep 5, 2026 If you want to get started quickly, click on the button below.

This creates a repository in your GitHub account and deploys the application to Cloudflare Workers.

import { parseCookie } from "cookie";
export default {
    async fetch(request) {
        // The name of the cookie
        const COOKIE_NAME = "__uid";
        const cookie = parseCookie(request.headers.get("Cookie") || "");
        if (cookie[COOKIE_NAME] != null) {
            // Respond with the cookie value
            return new Response(cookie[COOKIE_NAME]);
        }
        return new Response("No cookie with name: " + COOKIE_NAME);
    },
};

import { parseCookie } from "cookie";
export default {
    async fetch(request): Promise<Response> {
        // The name of the cookie
        const COOKIE_NAME = "__uid";
        const cookie = parseCookie(request.headers.get("Cookie") || "");
        if (cookie[COOKIE_NAME] != null) {
            // Respond with the cookie value
            return new Response(cookie[COOKIE_NAME]);
        }
        return new Response("No cookie with name: " + COOKIE_NAME);
    },
} satisfies ExportedHandler;

from http.cookies import SimpleCookie
from workers import WorkerEntrypoint, Response

class Default(WorkerEntrypoint):
    async def fetch(self, request):
        # Name of the cookie
        cookie_name = "__uid"

        cookies = SimpleCookie(request.headers["Cookie"] or "")

        if cookie_name in cookies:
            # Respond with cookie value
            return Response(cookies[cookie_name].value)

        return Response("No cookie with name: " + cookie_name)

import { Hono } from 'hono';
import { getCookie } from 'hono/cookie';

const app = new Hono();

app.get('*', (c) => {
  // The name of the cookie
  const COOKIE_NAME = "__uid";

  // Get the specific cookie value using Hono's cookie helper
  const cookieValue = getCookie(c, COOKIE_NAME);

  if (cookieValue) {
    // Respond with the cookie value
    return c.text(cookieValue);
  }

  return c.text("No cookie with name: " + COOKIE_NAME);
});

export default app;

External dependencies

This example requires the npm package cookie ↗︎ to be installed in your JavaScript project.

The Hono example uses the built-in cookie utilities provided by Hono, so no external dependencies are needed for that implementation.

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description: Send a request to a remote server, read HTML from the response, and serve that HTML. title: Fetch HTML image: https://developers.cloudflare.com/workers/examples/fetch-html/og.png?v=57dbdc19bd3715f2

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