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What is the difference between layout.js and template.js in Next.js?

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01

Understand the problem

Persistent shared UI vs a fresh instance per navigation.

nextjslayouttemplaterouting
02

Attempt it yourself

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03

Study the solution

A layout persists across navigations and keeps state/DOM. A template re-mounts a new instance on every navigation, resetting state and re-running effects — useful for enter/exit animations or per-navigation logic.

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04

Read the code

A template that resets per navigation
// app/template.tsx — re-created on every navigation
'use client';
import { useEffect } from 'react';
export default function Template({ children }) {
  useEffect(() => { trackPageView(); }, []);   // fires on EVERY navigation
  return <div className="fade-in">{children}</div>;
}
05

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