ServiceWorkerRegistration: index property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is available in Web Workers.

The index read-only property of the ServiceWorkerRegistration interface returns a reference to the ContentIndex interface, which allows for indexing of offline content.

Value

A ContentIndex object.

Examples

You can access the property from either your main script or the registered service worker.

Here is an example from the main script:

js
// reference registration
const registration = await navigator.serviceWorker.ready;

// feature detection
if ("index" in registration) {
  // Content Index API functionality
  const contentIndex = registration.index;
}

From the service worker:

js
// service worker script

const contentIndex = self.registration.index;

Specifications

Specification
Content Index
# dom-serviceworkerregistration-index

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
index
Experimental

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.

See also