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🔍 What Does InvalidStateError Mean?

This error happens when:
• You try to register a Service Worker on a non-secure origin (HTTP instead of HTTPS).
• You attempt to register it outside the main thread or in an invalid lifecycle phase.
• The browser is in a state where the Service Worker can’t be installed (e.g., page not fully loaded).

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✅ Checklist to Fix the Issue
1. Use HTTPS
Service Workers only work over HTTPS, except on localhost (which is allowed for development).
✅ Make sure your site is served over https://.
2. Correct Path
Check that the path to your service-worker.js file is correct and accessible.

navigator.serviceWorker.register('/service-worker.js')

3. Register After Page Load
   Always register the Service Worker after the load event or when DOMContentLoaded has fired:

window.addEventListener('load', () => {
  navigator.serviceWorker.register('/service-worker.js')
    .then(reg => console.log('SW registered', reg))
    .catch(err => console.error('SW registration failed', err));
});

4. Same Origin Policy
   Ensure your service-worker.js is on the same origin as your page. Cross-origin SWs are not allowed.
   5. Browser Support
   Verify you’re using a browser that supports Service Workers.

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🛠 Example Fixed Code

if ('serviceWorker' in navigator) {
  window.addEventListener('load', function () {
    navigator.serviceWorker.register('/service-worker.js')
      .then(function (registration) {
        console.log('ServiceWorker registration successful with scope: ', registration.scope);
      }, function (err) {
        console.error('ServiceWorker registration failed: ', err);
      });
  });
}

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❓Still Not Working?

If you’re still seeing the error, share:
• The registration code.
• The URL you’re running it on.
• The browser and version.

I can help troubleshoot it further!