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What is error.js in Next.js and how does error handling work in the App Router?

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01

Understand the problem

Segment-level error boundaries with reset.

nextjserror-handlingerror-boundaryapp-router
02

Attempt it yourself

Sketch your approach before reading the solution — that's what interviews test.

Nudge consolestandby

Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.

03

Study the solution

error.js defines a Client Component error boundary for its segment, catching render errors and showing fallback UI with a reset() to retry. global-error.js catches root-layout errors. Expected errors are handled in code; error.js is for unexpected ones.

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04

Read the code

A segment error boundary
// app/dashboard/error.tsx
'use client';                          // error boundaries are Client Components
export default function Error({ error, reset }: { error: Error; reset: () => void }) {
  return (
    <div>
      <p>Something went wrong: {error.message}</p>
      <button onClick={reset}>Try again</button>
    </div>
  );
}
05

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