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

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

**TL;DR.** 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**. initial bundle small on demand heavy chunk <text class='d-sub' x='292' y='90' text-anchor='midd

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Lazy-loading components and route-based splitting.

nextjscode-splittingnext-dynamicperformance

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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
}

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