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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

REST (Representational State Transfer)
An architectural style for designing networked applications using standard HTTP methods and stateless communication.
Structured Data (Schema.org)
A standardized vocabulary for marking up web content so search engines can understand and display it as rich results.
CSS Grid
A two-dimensional CSS layout system for creating complex grid-based designs with rows and columns.
MVC (Model-View-Controller)
An architectural pattern that separates an application into three components: data (Model), interface (View), and logic (Controller).
CDN (Content Delivery Network)
A distributed network of servers that delivers web content to users from the geographically closest location.
Responsive Design
A web design approach that makes web pages render well on all screen sizes using flexible layouts and media queries.
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