TanStack Query, formerly known as React Query, is a powerful data-fetching library for React and other frameworks. It simplifies managing server state, caching, synchronizing data, and more.

Key Features :

Data Fetching: Simplifies data-fetching logic with hooks like useQuery and useMutation.

Caching: Automatically caches fetched data, minimizing redundant requests.

Synchronization: Ensures fresh data by re-fetching on focus, reconnect, or stale.

Pagination/Infinite Scroll: Supports features like pagination and infinite scroll.

Optimistic Updates: Allows for smooth UI updates while waiting for server responses.

Error Handling: Centralized error handling for network requests.

Basic Example:
jsx

import { useQuery } from '@tanstack/react-query';
import axios from 'axios';

const fetchUsers = async () => {
  const { data } = await axios.get('/api/users');
  return data;
};

function Users() {
  const { data, error, isLoading } = useQuery(['users'], fetchUsers);

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

  return (
    <ul>
      {data.map(user => (
        <li key={user.id}>{user.name}</li>
      ))}
    </ul>
  );
}

In this example:

useQuery is used to fetch user data.

It handles loading, error states, and displaying the data.