TanStack Query in a Nutshell:

• A powerful data fetching and caching library for React, Vue, Solid, Svelte, and vanilla JS.
• Simplifies asynchronous data management and reduces boilerplate code.
• Offers optimistic updates, automatic refetching, and offline support.
• Integrates seamlessly with React Query Devtools for debugging and inspection.

Key Hooks:

1. useQuery:

• Fetches data from an asynchronous source (API, database, etc.).
• Automatically caches and refetches data based on configuration.
• Manages loading, error, and success states.

Example:

JavaScript

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

function Posts() {
  const { isLoading, error, data } = useQuery('posts', fetchPosts);

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

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

2. useInfiniteQuery:

• Fetches data in infinite scrolling or pagination scenarios.
• Fetches additional data as the user scrolls or navigates.

Example:

JavaScript

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

function InfinitePosts() {
  const { fetchNextPage, hasNextPage, isLoading, error, data } = useInfiniteQuery(
    'posts',
    fetchPosts,
    { getNextPageParam: (lastPage) => lastPage.nextPage }
  );

  // ... handle loading, error, and render posts
}

3. useMutation:

• Executes mutations (create, update, delete) on remote data.
• Manages optimistic updates and potentially refetches related queries.

Example:

JavaScript

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

function CreatePost() {
  const createPostMutation = useMutation(createPost);

  // ... handle form submission and mutation execution
}

Additional Hooks:

• useQueryClient: Access the query client for advanced control and custom hooks.
• useIsFetching: Check if a query is currently fetching data.
• useQueries: Fetch multiple queries in parallel.

Key Features:

• Optimistic Updates: Updates the UI immediately, even before server responses.
• Automatic Refetching: Refetches queries based on configuration (e.g., on focus, window focus, interval).
• Offline Support: Caches data for offline availability.
• React Query Devtools: Powerful debugging and inspection tool.

Official Resources:

• TanStack Query Documentation: https://tanstack.com/query (comprehensive overview, hooks, features, and examples)
• TanStack Query GitHub Repository: https://github.com/tanstack/query (source code, issues, and discussions)
• TanStack Query Devtools: https://chrome.google.com/webstore/