useIsClient vs useIsMounted

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Tip

useIsClient is primarily for handling SSR scenarios, while useIsMounted is for managing component lifecycle and preventing memory leaks or updates after unmounting.

Timing and Purpose

useIsClient specifically tells you if the code is running in a browser vs server environment
useIsMounted tells you if a component is currently mounted in the DOM

Implementation

useIsClient uses useState directly and only sets to true once
useIsMounted uses useRef and returns a callback function that checks the ref

Return Value

useIsClient returns a boolean directly

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useIsClient vs useIsMounted

Timing and Purpose

Implementation

Server-Side Rendering

Component Lifecycle

Race Conditions