react
Cannot update state on unmounted component
Can't perform a React state update on an unmounted component
Fixes
- 1.Return a cleanup function from useEffect to cancel async operations (e.g., AbortController)
- 2.Use a mounted ref flag: `const mounted = useRef(true)` and check before setState
- 3.Cancel subscriptions, timers, and pending requests in the useEffect cleanup
memory-leakasyncuseEffect
Related Errors
react3 fixes
React hydration mismatch
Hydration failed because.*server rendered HTML.*didn't match
- •Ensure server and client render same content
- •Use suppressHydrationWarning for dynamic content
react3 fixes
Text content hydration mismatch
Text content does not match server-rendered HTML
- •Don't use Date.now() or Math.random() in render
- •Use useEffect for client-only values
react3 fixes
use client directive error in Server Component
(useClient|use client).*server component
- •Add 'use client' at top of file
- •Move useState/useEffect to client component