TanStack Query Has a Free Data Fetching Library — Async State Management for React

A developer wrote useEffect + useState for every API call. Loading state, error state, refetching, caching, stale data, race conditions - each endpoint needed 30 lines of boilerplate.

TanStack Query (formerly React Query) handles all async state. Caching, background refetching, pagination, optimistic updates - in one hook.

What TanStack Query Offers for Free

• Automatic Caching - Intelligent cache management
• Background Refetching - Data stays fresh automatically
• Stale-While-Revalidate - Show cached data while fetching new
• Pagination - Built-in infinite scroll and pagination
• Optimistic Updates - Update UI before server responds
• Retry - Automatic retry with exponential backoff
• DevTools - Visual query inspector
• SSR - Server-side rendering support
• Framework Agnostic - React, Vue, Svelte, Solid, Angular

Quick Start

import { useQuery, useMutation, QueryClient, QueryClientProvider } from '@tanstack/react-query'

function Posts() {
  const { data, isLoading } = useQuery({
    queryKey: ['posts'],
    queryFn: () => fetch('/api/posts').then(r => r.json()),
  })
  if (isLoading) return <div>Loading...</div>
  return data.map(post => <div key={post.id}>{post.title}</div>)
}

GitHub: TanStack/query - 43K+ stars

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