Cloudflare Workers: panoramica

Cloudflare Workers is a serverless platform that runs your code on Cloudflare's global network — incredibly close to your users, wherever they are.

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.

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.

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.

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 run standard JavaScript (or TypeScript) on the V8 engine — the same one behind Chrome and Node. Familiar syntax, familiar tools.

A Worker listens for fetch events — incoming HTTP requests — and responds. This example just returns a plain Hello to any request.

addEventListener('fetch', ...) is your Worker's entry point: it runs your code on each incoming request, and event.respondWith() sends the reply back.

Workers give you standard Web APIs like Fetch and URL, plus Cloudflare extras like KV storage and Durable Objects — coming in later lessons.

Recap: Cloudflare Workers run serverless code at the edge, intercepting requests with fast, scalable, cheap JavaScript. Next: setting up your dev environment.