Question 1

What is a service worker?

Accepted Answer

A service worker is a script that the browser runs in the background, separate from a web page. It can intercept network requests, cache resources, and let your site work offline or load faster — the foundation of Progressive Web Apps (PWAs).

Question 2

Which caching strategy should I choose?

Accepted Answer

Cache-first is best for static assets (images, fonts, CSS/JS bundles) that rarely change. Network-first is best for HTML pages and API calls where fresh content matters but you want an offline fallback. Stale-while-revalidate serves cached content immediately while refreshing in the background — a great default for most assets.

Question 3

How do I register the generated service worker?

Accepted Answer

Copy the generated registration snippet into your main page JavaScript. It checks for service worker support and then registers sw.js from the root of your site, so it can control the whole scope. The generated code includes a ready-to-paste registration block.

Question 4

Is my configuration sent to a server?

Accepted Answer

No. The service worker code is generated entirely in your browser from the options you pick. Nothing is uploaded.