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What is request memoization in Next.js?

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01

Understand the problem

Automatic deduping of identical fetches during one render.

nextjsrequest-memoizationfetchcaching
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

Within a single server render, Next.js memoizes identical fetch() calls (same URL/options) so multiple components requesting the same data trigger only one network call. This lets you fetch where you need data without prop-drilling or manual deduping.

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04

Read the code

Colocated fetches deduped; cache() for DB
// Both call getUser() in the same render → one DB query
import { cache } from 'react';
export const getUser = cache(async (id: string) => db.user.find(id));

// layout.tsx and page.tsx can each await getUser(id) freely — deduped.
async function Layout({ params }) { const u = await getUser(params.id); /* ... */ }
async function Page({ params })   { const u = await getUser(params.id); /* same, cached */ }
05

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