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# is-network-error
> Check if a value is a [Fetch network error](https://developer.mozilla.org/en-US/docs/Web/API/fetch#exceptions)
This can be useful when you want to do something specific when a network error happens without catching other Fetch-related errors.
Unfortunately, Fetch network errors are [not standardized](https://github.com/whatwg/fetch/issues/526) and differ among implementations. This package handles the differences across Node.js, Bun, Deno, and browsers.
For instance, [`p-retry`](https://github.com/sindresorhus/p-retry) uses this package to retry on network errors.
## Install
```sh
npm install is-network-error
```
## Usage
```js
import isNetworkError from 'is-network-error';
async function getUnicorns() {
try {
const response = await fetch('unicorns.json');
return await response.json();
} catch (error) {
if (isNetworkError(error)) {
return localStorage.getItem('…');
}
throw error;
}
}
console.log(await getUnicorns());
```
## API
### `isNetworkError(value: unknown): value is TypeError`
Returns `true` if the given value is a Fetch network error, otherwise `false`.
This function acts as a type guard, narrowing the type to `TypeError` when it returns `true`.