TanStack Query (React Query) Complete Guide for 2025
Master TanStack Query for server state management in React. Learn caching, mutations, optimistic updates, and best practices for data fetching.
What is TanStack Query?
TanStack Query (formerly React Query) is a powerful data-fetching library that handles server state in React applications. It provides caching, background updates, and stale data management out of the box.
Why TanStack Query?
Problems It Solves
- Caching and cache invalidation
- Deduplicating requests
- Background refetching
- Pagination and infinite scroll
- Optimistic updates
Benefits
- Reduces boilerplate significantly
- Automatic background refetching
- Built-in loading and error states
- DevTools for debugging
Core Concepts
Queries
Fetch and cache data:
- Automatic caching
- Stale-while-revalidate
- Background refetching
- Retry on failure
Mutations
Modify server data:
- Optimistic updates
- Automatic cache invalidation
- Rollback on error
- Side effects handling
Query Keys
Unique identifiers for cached data:
- Array-based keys
- Hierarchical invalidation
- Automatic refetching
Common Patterns
Dependent Queries
Fetch data that depends on other data:
- Enable queries conditionally
- Chain data fetching
- Handle loading states
Infinite Queries
Implement pagination and infinite scroll:
- Fetch next/previous pages
- Merge page data
- Track pagination state
Optimistic Updates
Update UI before server confirms:
- Immediate feedback
- Rollback on error
- Better user experience
Best Practices
- Use query keys consistently: Establish naming conventions
- Set appropriate stale times: Balance freshness and performance
- Handle errors gracefully: Provide fallback UI
- Use DevTools: Debug caching issues easily
- Prefetch data: Improve perceived performance
TanStack Query vs SWR
| Feature | TanStack Query | SWR |
|---|---|---|
| Features | More extensive | Simpler |
| Bundle Size | Larger | Smaller |
| DevTools | Excellent | Basic |
| Mutations | Built-in | Manual |
Our Recommendation
TanStack Query is the best choice for applications with complex data requirements. For simpler needs, SWR or even fetch with React's use() hook may suffice.
Explore data fetching tools in our Tools directory or use our AI Stack Builder for recommendations.