Cloudflare Workers documentation

Cloudflare Workers provides a serverless Open external link execution environment that allows you to create entirely new applications or augment existing ones without configuring or maintaining infrastructure.

Cloudflare Workers runs on Cloudflare’s global cloud network Open external link in over 200 cities around the world, offering both free and paid plans.

Learn more about how Workers works.

Get started View the tutorials Explore betas

​​ Installing the Workers CLI

To install wrangler Open external link , ensure you have npm installed Open external link , preferably using a Node version manager like Volta Open external link or nvm Open external link . Using a version manager helps avoid permission issues and allows you to easily change Node.js versions. Then run:

$ npm install -g wrangler

or install with yarn:

$ yarn global add wrangler

Read more about installing Wrangler.

​​ Playground

View this Hello World example in the Workers playground:

Service Worker syntax
addEventListener("fetch", (event) => {
  event.respondWith(handleRequest(event.request));
});

async function handleRequest(request) {
  return new Response("Hello world");
}

Launch playground Open external link Learn more

Or try inputting the JavaScript modules syntax example:

Module syntax
export default {
  async fetch(request) {
    return new Response("Hello World!");
  },
};

​​ Related resources

• How Workers works – Learn how Cloudflare’s global network powers Workers
• Pricing – Learn about the Free and Bundled plans
• HTMLRewriter – Parse and transform HTML from inside a Worker
• Limits – Learn about plan limits (Free plans get 100,000 req/day)

​​ Community

Explore third-party packages Open external link that work on Workers, submitted by Cloudflare users.

Connect with the Workers community on Discord Open external link to ask questions, show off what you are building, and discuss the platform with other developers.

Follow @CloudflareDev on Twitter Open external link to learn about product announcements, new tutorials, and what is new in Cloudflare Workers.