Cloudflare Workers: Run Code at the Edge — Free for 100K Requests/Day

What Are Cloudflare Workers?

Cloudflare Workers are **serverless functions** that run JavaScript (or Rust/WebAssembly) on Cloudflare’s global edge — not on a distant VPS. They intercept HTTP requests before they hit your origin, letting you modify responses, route traffic, call APIs, or serve dynamic content — all in under 10ms worldwide. No cold starts, no scaling worries, and **100% free up to 100,000 requests/day**.

• Use Cases: URL shorteners, auth, A/B tests, API gateways, JSON APIs.
• Free Tier: 100K req/day, 10ms CPU each — enough for most hobby projects.

1. Open your computer’s Terminal (Mac/Linux) or Command Prompt / PowerShell (Windows).
2. Paste this command and press Enter:
   npm create cloudflare@latest
3. Wait 10–20 seconds — it downloads the tool.
4. You’ll see prompts:
   • Project name? → Type: hello-world → press Enter
   • Select a template: → Choose Hello World Worker → press Enter
   • Install dependencies? → Type y → press Enter
5. Done! A folder called hello-world is created with everything ready.

1. Open the hello-world folder in any code editor:
   • Free: VS Code (recommended)
   • Or use Notepad (Windows) / TextEdit (Mac)
2. Inside the folder, open the file: src/index.js
3. Delete everything and paste this simple code:
   export default {
     async fetch(request) {
       return new Response("Hello from Cloudflare Workers! 🚀", {
         headers: { "content-type": "text/plain" },
       });
     }
   };
4. Save the file (Ctrl+S or Cmd+S).

1. Back in your Terminal, make sure you’re inside the hello-world folder:
   cd hello-world
2. Paste this command and press Enter:
   npm run deploy
3. Wait 5–10 seconds. You’ll see:
   Deployed to: https://hello-world.yourname.workers.dev
   Published!
4. Copy the URL → open in browser → see your message live!