rsnext/docs/02-app/02-api-reference/02-file-conventions/not-found.mdx
2023-06-13 18:03:27 +00:00

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---
title: not-found.js
description: API reference for the not-found.js file.
---
The **not-found** file is used to render UI when the [`notFound`](/docs/app/api-reference/functions/not-found) function is thrown within a route segment. Along with serving a custom UI, Next.js will also return a `404` HTTP status code.
```tsx filename="app/blog/not-found.tsx" switcher
import Link from 'next/link'
export default function NotFound() {
return (
<div>
<h2>Not Found</h2>
<p>Could not find requested resource</p>
<p>
View <Link href="/blog">all posts</Link>
</p>
</div>
)
}
```
```jsx filename="app/blog/not-found.js" switcher
import Link from 'next/link'
export default function NotFound() {
return (
<div>
<h2>Not Found</h2>
<p>Could not find requested resource</p>
<p>
View <Link href="/blog">all posts</Link>
</p>
</div>
)
}
```
> **Good to know**: In addition to catching expected `notFound()` errors, the root `app/not-found.js` file also handles any unmatched URLs for your whole application. This means users that visit a URL that is not handled by your app will be shown the UI exported by the `app/not-found.js` file.
## Props
`not-found.js` components do not accept any props.
## Version History
| Version | Changes |
| --------- | --------------------------------------------------- |
| `v13.3.0` | Root `app/not-found` handles global unmatched URLs. |
| `v13.0.0` | `not-found` introduced. |