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What is Service Worker?

A JavaScript file that runs in the background, enabling offline support, push notifications, and background sync for web apps.

Service workers act as programmable network proxies between the browser and server. They intercept network requests, cache resources, and serve cached content when offline. This enables Progressive Web App (PWA) capabilities.

The lifecycle includes registration, installation (cache assets), and activation (clean old caches). The fetch event handler implements caching strategies: cache-first, network-first, stale-while-revalidate. Service workers also enable push notifications and background sync.

Related Terms

OAuth Scope
A mechanism in OAuth that limits an application's access to a user's account to specific resources or actions.
CORS Preflight
An automatic OPTIONS request sent by browsers before certain cross-origin requests to check if the actual request is permitted.
CSS Grid
A two-dimensional CSS layout system for creating complex grid-based designs with rows and columns.
Responsive Design
A web design approach that makes web pages render well on all screen sizes using flexible layouts and media queries.
Web Font Optimization
Techniques for loading custom fonts efficiently to minimize their impact on page load performance and visual stability.
Meta Tags
HTML elements in the page head that provide metadata about the document for browsers, search engines, and social media platforms.
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