This page is not complete.

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


var contentIndexObject = ServiceWorkerRegistration.index;


A ContentIndex Object


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

Here is an example from the main script:

// 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:

// service worker script

const contentIndex = self.registration.index;


Specification Status Comment
Content Index API
The definition of 'index' in that specification.
Editor's Draft Initial definition.

Browser compatibility

No compatibility data found. Please contribute data for "api.ServiceWorkerRegistration.index" (depth: 1) to the MDN compatibility data repository.

See also