Performance
Stop waiting on the network! You can improve your web app's performance by caching and serving your files, powered by a service worker.
Resilience
Even on an unreliable connection, your web app can still work using the right runtime caching strategies.
Enhancement
Looking to build a progressive web app? Workbox makes it easy to create an offline first experience.
Why Workbox?
Workbox is a library that bakes in a set of best practices and removes the boilerplate every developer writes when working with service workers.
- Precaching
- Runtime caching
- Strategies
- Request routing
- Background sync
- Helpful debugging
- Greater flexibility and feature set than sw-precache and sw-toolbox
What's the API Like?
Below are a few examples of the Workbox API demonstrating some of the common approaches developers take in their service workers.
Cache Google Fonts
Wish you could rely on Google Fonts being available offline after the user has visited your site? Add a quick rule to serve them from the cache.
workbox.routing.registerRoute( new RegExp('^https://fonts.(?:googleapis|gstatic).com/(.*)'), workbox.strategies.cacheFirst(), );
Cache JavaScript and CSS
Make your JS and CSS ⚡ fast by returning the assets from the cache, while making sure they are updated in the background for the next use.
workbox.routing.registerRoute( /\.(?:js|css)$/, workbox.strategies.staleWhileRevalidate(), );
Cache Images
Images carry most of the weight for a web page. Use this rule to serve them quickly from the cache, while making sure you don’t cache them indefinitely, consuming your users' storage.
workbox.routing.registerRoute( /\.(?:png|gif|jpg|jpeg|svg)$/, workbox.strategies.cacheFirst({ cacheName: 'images', plugins: [ new workbox.expiration.Plugin({ maxEntries: 60, maxAgeSeconds: 30 * 24 * 60 * 60, // 30 Days }), ], }), );
Precache your Files
Use Workbox to precache assets in your web app using our CLI, Node module or webpack plugin.
workbox wizard
const workboxBuild = require('workbox-build'); workboxBuild.generateSW({ swDest: './build/sw.js' globDirectory: './app', globPatterns: '**\/*.{js,css,html,png}', });
const WorkboxPlugin = require('workbox-webpack-plugin'); // webpack config { plugins: [ // Other webpack plugins... new WorkboxPlugin() ] }
Offline Google Analytics
Want offline analytics for your offline PWA? No problem.
workbox.googleAnalytics.initialize();
Workbox @ Chrome Dev Summit
Who's Using Workbox?






Learn how to use Workbox
Contributors
Workbox is built and maintained by friendly bunch of contributors without whom none of this would be possible.