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React useEffect best practices from official docs. Use when writing/reviewing useEffect, useState for derived values, data fetching, or state synchronization.…
You Might Not Need an Effect Effects are an escape hatch from React. They let you synchronize with external systems. If there is no external system involved, you shouldn't need an Effect. Quick Reference Situation DON'T DO Derived state from props/state useState + useEffect Calculate during render Expensive calculations useEffect to cache useMemo Reset state on prop change useEffect with setState key prop User event responses useEffect watching state Event handler directly Notify parent of changes useEffect calling onChange Call in event handler Fetch data useEffect without cleanup useEffect with cleanup OR framework When You DO Need Effects
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