Ask any question about Performance here... and get an instant response.

How can I register a service-worker to cache essential assets offline?

Asked on Oct 10, 2025

Answer

Registering a service worker to cache essential assets offline is a key strategy for improving web performance and reliability. This involves creating a service worker script that listens for the "install" event to cache necessary files.

<!-- BEGIN COPY / PASTE -->
    if ('serviceWorker' in navigator) {
      window.addEventListener('load', function() {
        navigator.serviceWorker.register('/service-worker.js').then(function(registration) {
          console.log('Service Worker registered with scope:', registration.scope);
        }, function(error) {
          console.log('Service Worker registration failed:', error);
        });
      });
    }
    <!-- END COPY / PASTE -->

Additional Comment:

Create a "service-worker.js" file in your root directory.
In the service worker script, listen for the "install" event to cache essential assets using the Cache API.
Ensure the service worker is registered after the page load event to avoid blocking the initial rendering.
Test the service worker in a controlled environment before deploying it to production.

✅ Answered with Core Web Vitals best practices.

Ask any question about Performance here... and get an instant response.

How can I register a service-worker to cache essential assets offline?

Asked on Oct 10, 2025

Answer

The Q&A Network