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Functions: notFound | Next.js

The notFound function allows you to render the not-found file within a route segment as well as inject a <meta name="robots" content="noindex" /> tag.

Invoking the notFound() function throws a NEXT_HTTP_ERROR_FALLBACK;404 error and terminates rendering of the route segment in which it was thrown. Specifying a not-found file allows you to gracefully handle such errors by rendering a Not Found UI within the segment.

import { notFound } from 'next/navigation'
 
async function fetchUser(id) {
  const res = await fetch('https://...')
  if (!res.ok) return undefined
  return res.json()
}
 
export default async function Profile({ params }) {
  const { id } = await params
  const user = await fetchUser(id)
 
  if (!user) {
    notFound()
  }
 
  // ...
}

Good to know: notFound() does not require you to use return notFound() due to using the TypeScript never type.

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