A Service Worker in JavaScript is a simple script file that runs in the background when a page is loaded on the browser and provides features that do not require any user interaction and other web pages. It is a programmable network proxy, which automatically terminates and restarts whenever it is required. The service workers heavily rely on the use of the Promises in JavaScript.
Some of the main features and roles of a service worker are listed below:
- Helps in offline first web application development.
- Timely background sync
- Push notifications
- Manages responses cache programmatically
- Intercept and handle network requests