TanStack Query Has a Free Library That Manages Server State — No More useEffect + useState for API Calls

The Data Fetching Problem Every React developer writes this: 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 refetching. No deduplication. No optimistic updates. TanStack Query handles all of this. One hook. Built-in cache. Automatic refetching. What TanStack Query Gives You useQuery — Replace useEffect import { useQuery } from ' @tanstack/react-query ' ; function Users () { const { data , isLoading , error } = useQuery ({ queryKey : [ ' users ' ], queryFn : () => fetch ( ' /api/users ' ). then ( r => r . json ()), }); if ( isLoading ) return < p > Loading... </ p >; if ( error ) return < p > Error: { error . message } </ p >; return < ul > { data . map ( u => < li key = { u . id } > { u . name } </ li >) } </ ul >; } Cach