TanStack Query Has a Free Data Fetching Library That Replaces useEffect

TanStack Query handles caching, deduplication, background refresh, and optimistic updates. Stop writing useEffect for API calls. The useEffect Problem Every React developer writes this pattern: const [ data , setData ] = useState ( null ); const [ loading , setLoading ] = useState ( true ); const [ error , setError ] = useState ( null ); useEffect (() => { fetch ( ' /api/users ' ) . then ( r => r . json ()) . then ( setData ) . catch ( setError ) . finally (() => setLoading ( false )); }, []); No caching. No deduplication. No background refresh. No retry. No pagination. No optimistic updates. TanStack Query solves ALL of this with one hook. What You Get for Free import { useQuery } from ' @tanstack/react-query ' ; function Users () { const { data , isLoading , error } = useQuery ({ queryKey : [ ' users ' ], queryFn : () => fetch ( ' /api/users ' ). then ( r => r . json ()), }); } This one hook gives you: Caching — data stored by queryKey, shared across components Deduplication — 10 com