TanStack Query

TanStack Query is the missing piece for working with server data in React and React Native. Instead of treating API data like local state, it gives you a dedicated system for the real problems: caching, refetching, deduping requests, and keeping the UI in sync when data changes. In this topic, you'll learn why TanStack Query exists and how to use it in real apps. We'll start with a clean setup (QueryClient + providers), then move into the essentials: query keys, caching strategies, and when/why queries refetch. From there we'll build practical patterns you'll reuse constantly: infinite scrolling, mutations, and invalidation so your UI stays correct. By the end, you'll know how to design predictable data flows (loading, error, success), keep performance snappy, and debug issues quickly using the Query Devtools — so your app feels “instant” even when the network isn't.