State Management with React Query + Zustand

Version 1.1.0 | TanStack Query v5 | Zustand v5 | March 2026

Note: This document provides comprehensive patterns for AI agents and LLMs working with TanStack Query v5 and Zustand v5. All examples are verified against v5 APIs. Optimized for automated refactoring, code generation, and state management best practices.

v5 Breaking Changes (Quick Reference)

TanStack Query v5:

• cacheTime → gcTime
• keepPreviousData option → placeholderData: keepPreviousData (imported helper)
• isPreviousData → isPlaceholderData
• onSuccess/onError/onSettled removed from useQuery — still valid on useMutation
• suspense: true on useQuery removed → use useSuspenseQuery