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The fetchLater() method requests a deferred fetch sent at an unknown time. The browser chooses a reliable time to send the request, ideally when the document is unloaded, and ignores the response. This API is useful for sending beacons to a server without expecting a particular response.

Browser support

Chrome 135 Released on 2025-04-01
Chrome Android 135 Released on 2025-04-01
Edge 135 Released on 2025-04-04
Firefox Not supported Position: positive Bugs: 1936180
Firefox for Android Not supported Position: positive Bugs: 1936180
Safari Not supported Position: support (concerns: complexity, privacy, integration, venue, API design, maintenance) Bugs: 284347
Safari on iOS Not supported Position: support (concerns: complexity, privacy, integration, venue, API design, maintenance) Bugs: 284347

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MDN documentation

Fetch API

Specifications

Fetch (#dom-window-fetchlater), from Fetch Workstream (WHATWG).

Usage (according to Chrome Platform Status)

~4.379% of page loads. More data at chromestatus.com.

Web Platform Tests (WPT)

View the latest WPT test results for this feature

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