TanStack Query Has a Free API You Should Know About

TanStack Query (formerly React Query) is a powerful data-fetching library that handles caching, background updates, stale data, and pagination — so you don't have to.

Why TanStack Query Eliminates Data Fetching Pain

A React developer had 200+ lines of useEffect, useState, and manual caching logic for each API call. Loading states, error handling, retry logic, cache invalidation — all duplicated across 50 components. TanStack Query replaced all of it with 5-line hooks.

Key Features:

• Automatic Caching — Smart cache with configurable stale times
• Background Refetching — Data stays fresh without manual intervention
• Pagination & Infinite Scroll — Built-in support
• Optimistic Updates — Instant UI updates before server responds
• DevTools — Visual debugging panel

Quick Start

npm install @tanstack/react-query

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

function Posts() {
  const { data, isLoading, error } = useQuery({
    queryKey: ["posts"],
    queryFn: () => fetch("/api/posts").then(r => r.json())
  })

  if (isLoading) return <div>Loading...</div>
  if (error) return <div>Error: {error.message}</div>

  return data.map(post => <div key={post.id}>{post.title}</div>)
}

Mutations with Optimistic Updates

const mutation = useMutation({
  mutationFn: (newPost) => fetch("/api/posts", { method: "POST", body: JSON.stringify(newPost) }),
  onSuccess: () => queryClient.invalidateQueries({ queryKey: ["posts"] })
})

Framework Support

Works with React, Vue, Solid, Svelte, and Angular.

Why Choose TanStack Query

1. Eliminates boilerplate — no more useEffect data fetching
2. Smart caching — reduces API calls by 70-90%
3. Production-ready — used by thousands of companies

Check out TanStack Query docs to get started.

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