useLayoutEffect SSR ⚛️ React

Warning: useLayoutEffect does nothing on the server

A component using useLayoutEffect was server-rendered, where layout effects can’t run.

Seen on: React

Meaning

Common in libraries during SSR (Next.js, Remix). Usually harmless; React 18.3+ removed this warning.

Common causes

  • Library component using useLayoutEffect rendered on the server
  • Your own SSR components measuring layout

⚡ Quick fix

  1. Use an isomorphic layout effect (useEffect on the server)
  2. Render the component client-only
  3. Upgrade React/library

Detailed fix by platform

React

  1. const useIsoLayoutEffect = typeof window !== 'undefined' ? useLayoutEffect : useEffect;

How to diagnose

  1. Component — Which one?
  2. Need — Must it measure layout?

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