There is no single right state library — there is a right tool for each kind of state. Most state-management pain comes from using one tool for everything: caching server data in Redux, or lifting trivial UI state into a global store. Match the tool to the data.
Key takeaways
- Start with local state and introduce shared state only when ownership becomes unclear.
- Treat remote server data differently from client-side application state.
- Choose a tool the team can debug, test, and maintain under production pressure.
Start small and promote deliberately
Begin with useState/useReducer inside the component that owns the data. Lift state up only when two siblings need it, and reach for Context only for low-frequency, widely-read values like theme or the current user. Context re-renders every consumer on change, so it is the wrong tool for fast-changing state.
When global client state genuinely grows, a small store like Zustand keeps boilerplate low; Redux Toolkit is worth it when you need strict conventions, middleware, and time-travel debugging across a large team.
Server state is not application state
Data that lives on a server — lists, profiles, anything you fetch — should be handled by a data-fetching cache such as React Query, not stored manually in a global store. These libraries give you caching, deduping, background refetch, and stale-while-revalidate for free, and remove most of the synchronization bugs teams write by hand.
The practical rule: client UI state in a store or local state, server cache in a query library, persistent secrets in secure storage. Keeping them separate is what keeps the app debuggable.