Dev Tools · 2h ago
React's useIsomorphicLayoutEffect: Fix SSR Warning Without Visual Bugs
React's useLayoutEffect triggers a warning in server-side rendering because it can't run on the server. Switching to useEffect reintroduces layout flickers. The useIsomorphicLayoutEffect hook solves both by using useLayoutEffect on the client and useEffect on the server.
Meridian48 take
A one-line fix that every SSR React developer should know, but the real lesson is that React's SSR model still forces awkward workarounds for layout measurement.
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React useIsomorphicLayoutEffect: Fix the SSR useLayoutEffect Warning (2026) →
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