TanStack Query - Async State Management
Master data fetching, caching, synchronization, and background updates with TanStack Query
What is this?
TanStack Query eliminates the need for manual async state management by handling loading states, caching, refetching, and background updates automatically. This showcase demonstrates queries for data fetching, mutations for data updates, and automatic cache invalidation.
Why use this?
- Automatic caching and intelligent cache invalidation
- Background refetching and stale-while-revalidate patterns
- Optimistic updates with automatic rollback on error
- Request deduplication - multiple components requesting same data make only one API call
- Powerful DevTools for debugging query state and cache
- Reduces boilerplate by 50-70% compared to manual async management
Implementation Details
1. Setup QueryClient
Wrap your app with QueryClientProvider to enable TanStack Query throughout your component tree.
2. Fetching Data with useQuery
Use useQuery to fetch data with automatic caching and refetching.
3. Mutations for Data Updates
Use useMutation to modify server data with automatic loading states and error handling.
4. Cache Invalidation
Manually refetch queries or use queryClient.invalidateQueries for automatic cache updates.
Key Concepts
Query Keys
Query keys uniquely identify queries and their cached data. They can be simple strings or arrays with parameters, allowing for hierarchical cache management.
Automatic Background Refetching
Queries automatically refetch in the background when the window regains focus, network reconnects, or at configured intervals, keeping your data fresh.
Stale-While-Revalidate
Cached data is served immediately (stale), while a background refetch updates it. Users see instant results that are then refreshed with the latest data.
Request Deduplication
If multiple components request the same query simultaneously, only one network request is made, and all components share the result.
Related Projects
Related project: react-patterns-tanstack-table
Related project: state-management-tanstack-store
Note: Related project cards will be populated from the registry