Cloudflare Workers: An Overview
Learn about Cloudflare Workers as a serverless platform for deploying code at the edge, closer to users.
Cloudflare Workers: An Overview is a free Edge Computing with Cloudflare Workers & Deno lesson on CoddyKit — lesson 2 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Edge Computing with Cloudflare Workers & Deno learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Meet Cloudflare Workers
Cloudflare Workers is a serverless platform that runs your code on Cloudflare's global network — incredibly close to your users, wherever they are.
Serverless, but Closer
Like AWS Lambda, Workers are serverless — you write code, Cloudflare runs it with no servers to manage. The twist: it executes at the edge, near every user.
How Workers Intercept Requests
A Worker intercepts requests. Before a call hits your origin, it lands on a Cloudflare edge server where your code can modify, answer, or redirect it.
Why Choose Workers?
Workers are fast (code runs milliseconds from users), auto-scaling, cheap (pay per use), and global across hundreds of data centers. Ideal for modern apps.
Common Worker Use Cases
Workers shine for A/B testing, API gateways, content personalization, and on-the-fly image resizing — a lightweight backend or a boost to your existing one.
Workers Use JavaScript
Workers run standard JavaScript (or TypeScript) on the V8 engine — the same one behind Chrome and Node. Familiar syntax, familiar tools.
Anatomy of a Worker
A Worker listens for fetch events — incoming HTTP requests — and responds. This example just returns a plain Hello to any request.
addEventListener('fetch', event => {
event.respondWith(handleRequest(event.request))
})
async function handleRequest(request) {
// This Worker responds to ANY incoming request
return new Response('Hello from Cloudflare Worker!', {
headers: { 'content-type': 'text/plain' },
})
}The 'fetch' Event
addEventListener('fetch', ...) is your Worker's entry point: it runs your code on each incoming request, and event.respondWith() sends the reply back.
Worker Environment & APIs
Workers give you standard Web APIs like Fetch and URL, plus Cloudflare extras like KV storage and Durable Objects — coming in later lessons.
Check Your Understanding
Which of the following are key benefits of using Cloudflare Workers?
Workers Overview Recap
Recap: Cloudflare Workers run serverless code at the edge, intercepting requests with fast, scalable, cheap JavaScript. Next: setting up your dev environment.
Frequently asked questions
Is the “Cloudflare Workers: An Overview” lesson free?
Yes — the full text of “Cloudflare Workers: An Overview” is free to read here on the web, and the Edge Computing with Cloudflare Workers & Deno course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Edge Computing with Cloudflare Workers & Deno course, upgrade to CoddyKit PRO.
What will I learn in “Cloudflare Workers: An Overview”?
Learn about Cloudflare Workers as a serverless platform for deploying code at the edge, closer to users. You practise Edge Computing with Cloudflare Workers & Deno with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Edge Computing with Cloudflare Workers & Deno?
No prior experience is required. Edge Computing with Cloudflare Workers & Deno on CoddyKit is structured for beginners through advanced learners; this is — lesson 2 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Cloudflare Workers: An Overview” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Edge Computing with Cloudflare Workers & Deno lesson?
Yes. Every Edge Computing with Cloudflare Workers & Deno lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- What is Edge Computing?
- Cloudflare Workers: An Overview
- Deno: A Runtime for the Edge
- Edge vs Cloud vs CDN