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Abort a fetch request in JavaScript

content/snippets/js/s/abort-fetch.md

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The Fetch API is nowadays the de facto way to send asynchronous requests in JavaScript. This is in part due to the fact that the fetch() method accepts a multitude of useful options. One of these is the signal option, which can be used to abort a request. To create a valid value for this option, you can use AbortController.signal after creating a new instance of AbortController. Then, you can use AbortController.abort() to cancel the request at any time.

js
// Create the AbortController
const controller = new AbortController();
const { signal } = controller;

// Perform the request
fetch('https://my.site.com/data', { signal }).then(res => console.log(res));

// Abort the request
controller.abort();

This is particularly useful in scenarios where a request takes too long or the response is no longer needed. You can see a common React use-case for this in the useFetch hook.