Answer
useEffect runs after the browser paints. useLayoutEffect runs before paint and is used for layout measurements.
Quick Answer
Both run after render, but at different times. useLayoutEffect fires synchronously after DOM mutations but before the browser paints — use it when you need to measure or adjust the DOM (like reading element size) before the user sees anything. useEffect fires after painting — use it for async operations and subscriptions.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ