Not found Next.js

Why This Happens

In Next.js, the notfound() function was called. This is one of the most common Next.js errors developers encounter. Understanding the root cause helps you fix it quickly and prevent it from recurring.

The Problem

import { notFound } from 'next/navigation';
const data = await fetch(url);
if (!data) notFound();

The Fix

// This is intentional — create app/not-found.tsx
// to customize the 404 page

Step-by-Step Fix

1. 1

   Identify the error

   Look at the error message: NEXT_NOT_FOUND. This tells you exactly what went wrong.

2. 2

   Find the cause

   Check the stack trace to find which line of your Next.js code triggered this error.

3. 3

   Apply the fix

   Use the corrected code pattern shown above. Test to confirm the error is resolved.