Cloudflare Workers Snippets: Copy-Ready Code for the Edge

Cloudflare Workers let you run JavaScript at the edge, close to your users, without managing a server. If you want a working redirect, header injection, or caching rule fast, the quickest path is to grab a tested snippet and drop it into your Worker. Here is how Workers are structured and how to find the right snippet.

How Cloudflare Workers are structured

Modern Cloudflare Workers use the ES module syntax. You export a default object with an async fetch(request, env, ctx) handler that receives the incoming request and returns a response:

export default {
  async fetch(request, env, ctx) {
    return new Response("Hello from the edge");
  },
};

The request is the incoming HTTP request, env holds your bindings and variables, and ctx lets you extend the Worker lifecycle. Everything you build sits inside that handler.

Common Cloudflare Workers patterns

Most real-world Workers fall into a handful of patterns, and each is a few lines of code:

• Redirects: send old paths to new URLs with a 301 or 302.
• Header injection: add security or custom headers to every response.
• A/B testing: split traffic between two variants by cookie or percentage.
• Routing: serve different logic based on the request path.
• Caching: store and reuse responses to cut origin load.
• Rate limiting: throttle abusive clients at the edge.

Rather than rewriting these from scratch, the Cloudflare Workers Snippets library keeps them all in one place as copy-ready code.

Copy a snippet in three steps

1. Open the Cloudflare Workers Snippets library and browse by pattern.
2. Find the snippet you need, such as a redirect or header injection.
3. Click copy, paste it into your Worker, and adjust the values for your domain.

The library is just displayed text, so everything stays in your browser. Nothing is sent anywhere, and you can read each snippet before you use it.

Related tools

• Security Headers Generator: build the exact header values your Worker should inject.
• Cache-Control Header Generator: craft caching rules to pair with a caching Worker.
• JSON Formatter & Validator: clean up any JSON payloads your Worker reads or returns.

Pick the pattern you need, copy the snippet, and ship it to the edge in minutes.