Progressive Web App (PWA) implementation guide: turn your website into an installable app
PWA gives websites native app capabilities: installable to home screen, offline operation, push notifications.
Three core components
- Manifest.json — app metadata (icons, name, theme color)
- Service Worker — offline caching, push notifications, background sync
- HTTPS — PWA requires HTTPS
Step 1: Configure Manifest
Create manifest.json with app name, icons (192x192, 512x512), start URL, display mode, theme color.
Step 2: Register Service Worker
Register sw.js in your main JavaScript file. Check browser support first.
Step 3: Service Worker caching strategies
| Strategy | Description | Use case |
|---|---|---|
| Cache First | Use cache, fallback to network | Static assets |
| Network First | Try network, fallback to cache | API, dynamic pages |
| Stale While Revalidate | Return cached, update in background | Semi-static content |
| Network Only | Always fetch from network | Payments, forms |
| Cache Only | Only use cache | Offline page |
Offline page
Create an offline.html that displays when the user has no connectivity.
Testing tools
- Lighthouse — Chrome DevTools PWA audit
- PWABuilder — Microsoft's PWA packaging tool
16IDC Takeaway
PWA offers one of the best ROI for improving website user experience. Low implementation cost (just manifest + service worker) with significant user engagement improvements. Recommended for all content and tool websites.
Related: Performance optimization guide