FetchEvent: resultingClientId property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2022.

Note: This feature is only available in Service Workers.

The resultingClientId read-only property of the FetchEvent interface is the id of the client that replaces the previous client during a page navigation.

For example, when navigating from page A to page B resultingClientId is the ID of the client associated with page B.

If the fetch request is a subresource request or the request's destination is report, resultingClientId will be an empty string.

Value

A string.

Examples

js
self.addEventListener("fetch", (event) => {
  console.log(event.resultingClientId);
});

Specifications

Specification
Service Workers Nightly
# fetch-event-resultingclientid

Browser compatibility

desktop mobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
resultingClientId
Chrome – Full support
Chrome 72 (Release date: 2019-01-29)
footnote Full support
Edge – Full support
Edge 79 (Release date: 2020-01-15)
footnote Full support
Firefox – Full support
Firefox 65 (Release date: 2019-01-29)
footnote Full support
Opera – Full support
Opera 60 (Release date: 2019-04-09)
footnote Full support
Safari – Full support
Safari 16 (Release date: 2022-09-12)
footnote Full support
Chrome Android – Full support
Chrome Android 72 (Release date: 2019-01-29)
footnote Full support
Firefox for Android – Full support
Firefox for Android 65 (Release date: 2019-01-29)
footnote Full support
Opera Android – Full support
Opera Android 50 (Release date: 2019-02-18)
footnote Full support
Safari on iOS – Full support
Safari on iOS 16 (Release date: 2022-09-12)
footnote Full support
Samsung Internet – Full support
Samsung Internet 11 (Release date: 2019-12-05)
footnote Full support
WebView Android – Full support
WebView Android 72 (Release date: 2019-01-29)
footnote Full support
WebView on iOS – No support
WebView on iOS
footnote No support

Legend

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

Full support
Full support
No support
No support

See also