PWA for Ecommerce: Native Experience on Web

1. The Native App vs. Progressive Web App Paradigm

Building separate native iOS (Swift) and Android (Kotlin) apps for e-commerce incurs immense development overhead and friction: users must visit an app store, download a 100MB file, and grant permissions before completing a purchase. PWAs deliver native app functionality—home screen installation, push notifications, and offline caching—directly inside the web browser with zero download friction.

2. Service Worker Cache-First Implementation

// E-Commerce Service Worker: Cache-First for Assets, Network-First for API
const CACHE_NAME = 'modracx-store-v1';
const STATIC_ASSETS = [
  '/',
  '/style.min.css',
  '/script.min.js',
  '/offline.html'
];

self.addEventListener('install', (e) => {
  e.waitUntil(
    caches.open(CACHE_NAME).then(cache => cache.addAll(STATIC_ASSETS))
  );
});

self.addEventListener('fetch', (e) => {
  if (e.request.url.includes('/api/')) {
    // Network-first for dynamic product catalog & inventory APIs
    e.respondWith(
      fetch(e.request).catch(() => caches.match('/offline.html'))
    );
  } else {
    // Cache-first for static assets
    e.respondWith(
      caches.match(e.request).then(res => res || fetch(e.request))
    );
  }
});

3. Frequently Asked Questions (FAQ)

1. How does a Service Worker enable offline browsing?

Service Workers run in a background thread, intercepting HTTP fetch requests and serving cached HTML/CSS/JS assets from CacheStorage when offline.

2. What is the Web App Manifest configuration?

A JSON file (`manifest.json`) specifying app branding, standalone display mode, background colors, and maskable icons for home screen installation.