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How does code splitting and next/dynamic work in Next.js?

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01

Understand the problem

Lazy-loading components and route-based splitting.

nextjscode-splittingnext-dynamicperformance
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

Next.js automatically code-splits per route. next/dynamic (or React.lazy) defers loading a heavy or client-only component until needed, with an optional loading fallback and ssr:false to skip server rendering — shrinking the initial bundle.

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04

Read the code

Lazy-load a heavy client-only component
import dynamic from 'next/dynamic';

// heavy charting lib — split into its own chunk, client-only, with a fallback
const Chart = dynamic(() => import('./Chart'), {
  ssr: false,
  loading: () => <p>Loading chart…</p>,
});

export default function Dashboard() {
  return <Chart data={data} />;   // Chart JS loads only when this renders
}
05

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