# When fetch Fails

fetch rejects only when no answer arrives at all, so check response.ok for answers like 404 and 500, catch network errors and timeouts (AbortSignal.timeout) with try/catch, and turn each one into a message a person understands.

![Cheat sheet: When fetch Fails](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/10/a47dc76a908341c88f4046c4bd32f078.webp)

- Category: JavaScript
- Level: Journeyman
- Tags: 404 Not Found, 500 Internal Server Error, AbortSignal.timeout(), catch Block (javascript), JavaScript, Response Object, rest-api, web-development
- Updated: November 1, 2026

Source: https://www.ask-codey.com/cheat-sheets/javascript-fetch-when-it-fails-cheat-sheet