How to make a PWA work offline

1. Pre-cache Core Assets: Use the Service Worker's install event to save essential files so the app shell always loads.
2. Intercept Network Requests: Add a fetch event listener to catch every HTTP request the browser makes.
3. Serve via Strategies: Use caches.match() to check for local files first, only using the network if the cache misses.
4. Cache Dynamically: Clone valid network responses and save them using cache.put() for future offline access.

API

Code

Links & Documentation

• Workbox
• Fetch Event on MDN
• Common strategies