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.

Learning resources on MDN

• FetchLaterResult
• FetchLaterResult: activated property
• fetchLater() API

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 ❌ See bugzil.la/1936180
• Firefox for Android ❌ See bugzil.la/1936180
• Safari ❌ See webkit.org/b/284347
• Safari on iOS ❌ See webkit.org/b/284347

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