Service Workers

⚙️ What Are Service Workers?

A Service Worker is a special type of JavaScript file that runs in the background, separate from the web page, and enables powerful features like:

✅ Offline caching
✅ Background sync
✅ Push notifications
✅ Intercepting and handling network requests

🧠 Think of it as a programmable network proxy between your app and the internet.

🚀 Key Capabilities

Feature	Description
🌐 Offline Support	Cache pages and assets so your site works without internet
🔁 Network Interception	Serve cached files or fetch new ones intelligently
📬 Push Notifications	Re-engage users even when app is closed
🔄 Background Sync	Retry failed requests once internet is back
🛠️ Custom Fetch Handling	Decide how requests are handled (e.g., stale-while-revalidate)

📁 Simple Example of a Service Worker

1. ✅ `sw.js` (Service Worker Script)

const CACHE_NAME = 'v1';
const urlsToCache = ['/', '/index.html', '/styles.css', '/offline.html'];

self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME).then(cache => {
      console.log('[Service Worker] Caching files');
      return cache.addAll(urlsToCache);
    })
  );
});

self.addEventListener('fetch', (event) => {
  event.respondWith(
    fetch(event.request).catch(() => caches.match(event.request).then(response => response || caches.match('/offline.html')))
  );
});

2. ✅ Register the Service Worker in Your App

🧠 How It Works

Phase	Description
Install	Cache static files
Activate	Clean up old caches
Fetch	Intercept network requests & respond with cached data
Push (optional)	Receive push notifications from a server
Sync (optional)	Resume failed requests later

⚠️ Service Worker Limitations

Must be served over HTTPS (except localhost)
Does not have access to DOM (use postMessage to communicate)
Browser support is good but needs testing
Can be tricky to debug due to caching and versioning

📦 Tools to Simplify Service Worker Use

Tool	Use Case
Workbox	Google’s library for building advanced SWs easily
Create React App (CRA)	Comes with basic SW setup
Next.js	Needs `next-pwa` plugin
Vue CLI	Has a PWA plugin with SW support
SvelteKit	Use `vite-plugin-pwa` for SWs

🧪 Test Your Service Worker

Use Chrome DevTools > Application tab > Service Workers
Simulate Offline Mode
Clear storage to force updates
Use Lighthouse to check PWA compliance

📚 Learn More

🌐 Service Workers on MDN
📘 Workbox Docs
🎥 YouTube: Build a PWA in 10 Minutes (Fireship)

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Service Workers

⚙️ What Are Service Workers?

🚀 Key Capabilities

📁 Simple Example of a Service Worker

1. ✅ sw.js (Service Worker Script)

2. ✅ Register the Service Worker in Your App

🧠 How It Works

⚠️ Service Worker Limitations

📦 Tools to Simplify Service Worker Use

🧪 Test Your Service Worker

📚 Learn More

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1. ✅ `sw.js` (Service Worker Script)