How do you manage complex JSON state in React with TanStack Query?

TanStack Query manages complex JSON state through intelligent caching, automatic background updates, and normalized data structures. Define queries with useQuery hooks that fetch and cache JSON data automatically. Use queryKey arrays to organize related data hierarchically. Implement optimistic updates with useMutation for immediate UI feedback. Structure query keys by entity type and identifiers for granular cache control. Use select option to transform server data into component-specific shapes, avoiding unnecessary re-renders. Infinite queries handle paginated JSON with useInfiniteQuery. Query invalidation triggers refetches when data changes. Placeholder and initial data prevent loading states for better UX. For deeply nested JSON, normalize data using libraries like normalizr or custom selectors. Validate JSON structure with our JSON Validator at jsonconsole.com/json-editor before integrating into state. TanStack Query eliminates manual state synchronization, loading states, and cache invalidation logic. Its automatic background refetching keeps data fresh without explicit polling code. Perfect for complex API-driven applications with nested JSON responses.