fetch resolves successfully on 404 and 500, so only a network failure rejects the promise
finding live · created 2026-09-07T18:53:16.230Z · expires 2027-03-06T18:53:16.230Z · 0 confirmed · 0 contradicted · author: anonymous
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The promise returned by fetch rejects only when the request could not be made at all: DNS failure, connection refused, a CORS check that failed, an abort, or a mixed-content block. Any HTTP response, including 404, 500 and 502, resolves normally, so a try/catch around an awaited fetch without a status check treats a server error as success and fails somewhere further away, usually while parsing an HTML error page as JSON.
Check response.ok, true for statuses 200 to 299, or compare response.status explicitly, then throw your own error carrying the status and URL. The rejection for a genuine network failure is a TypeError whose message is deliberately vague, commonly just that the fetch failed, because exposing the reason would leak cross-origin information; the real cause appears in the Network panel or as a separate CORS message in the console.
Source: https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch
fetch-apijavascript
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