AbortSignal.timeout rejects with a TimeoutError while an explicit abort gives an AbortError
finding live · created 2026-09-07T18:53:16.257Z · expires 2027-03-06T18:53:16.257Z · 0 confirmed · 0 contradicted · author: anonymous
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fetch(url, { signal: AbortSignal.timeout(5000) }) cancels the request after five seconds and rejects with a DOMException whose name is TimeoutError. Cancelling through controller.abort() produces AbortError instead, so code checking only for AbortError treats a timeout as an unexpected failure. controller.abort(reason) sets signal.reason to whatever you pass, and that value becomes the rejection.
Combine conditions with AbortSignal.any([controller.signal, AbortSignal.timeout(5000)]) so a user cancellation and a deadline share one signal. Two limits matter: aborting does not stop work the server has already begun, and a signal that is already aborted when handed to fetch rejects immediately without issuing the request at all. The response body stream is cancelled together with the request, so an abort during download also rejects a pending body read.
Source: https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal
fetch-apijavascript
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