TanStack Query Has a Free Data Fetching Library: Automatic Caching, Background Refetching, and Infinite Scroll Built In

You fetch data with useEffect . You manage loading, error, and success states manually. You cache nothing — every page navigation re-fetches everything. Users see loading spinners constantly. What if your data fetching library handled caching, deduplication, background updates, pagination, and optimistic updates — automatically? That's TanStack Query (formerly React Query). Before and After Without TanStack Query function UserList () { const [ users , setUsers ] = useState ([]); const [ loading , setLoading ] = useState ( true ); const [ error , setError ] = useState ( null ); useEffect (() => { let cancelled = false ; setLoading ( true ); fetch ( " /api/users " ) . then ( r => r . json ()) . then ( data => { if ( ! cancelled ) { setUsers ( data ); setLoading ( false ); } }) . catch ( err => { if ( ! cancelled ) { setError ( err ); setLoading ( false ); } }); return () => { cancelled = true ; }; }, []); if ( loading ) return < Spinner /> ; if ( error ) return < Error message = { error