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What makes a route dynamic in the Next.js App Router?

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01

Understand the problem

Dynamic functions and uncached data opt a route out of static rendering.

nextjsdynamic-renderingcookiesheaders
02

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03

Study the solution

Using cookies(), headers(), draftMode(), or the searchParams prop, or fetching with no-store / no cache, makes a route dynamic (rendered per request). Without those, Next.js prerenders the route statically by default.

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04

Read the code

Both ways to opt into dynamic
// Implicit: reading a dynamic function
import { headers } from 'next/headers';
const ua = (await headers()).get('user-agent');   // → dynamic

// Or uncached data:
await fetch('https://api/now', { cache: 'no-store' });  // → dynamic

// Explicit segment config:
export const dynamic = 'force-dynamic';
export const revalidate = 0;
05

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