└── README.md


/README.md:
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 1 | # React Query: Simplifying Data Fetching in React 🚀
 2 | 
 3 | React Query is a powerful library designed to simplify data fetching, synchronization, and server-side updates in React applications. It provides an intuitive API for handling remote data efficiently and offers features like caching, background synchronization, and error handling.
 4 | 
 5 | ---
 6 | 
 7 | ## Why Use React Query? 🌟
 8 | 
 9 | 1. **Easy Data Fetching**: Simplifies fetching data with a single hook. 🎣
10 | 2. **Automatic Caching**: Saves fetched data to reduce load times and server requests. 💾
11 | 3. **Background Updates**: Keeps your app's data fresh without user intervention. 🔄
12 | 4. **Error Handling**: Smoothly manages errors and retries fetching if needed. 🛠️
13 | 5. **Developer Tools**: Offers tools for debugging and optimizing your data fetching strategies. 🛠️
14 | 
15 | ---
16 | 
17 | ## `useQuery`: The Core Hook for Fetching Data 🎯
18 | 
19 | React Query provides the `useQuery` hook, which helps manage asynchronous data fetching seamlessly. This hook takes care of caching, background fetching, and data synchronization.
20 | 
21 | ### Key Parameters:
22 | 
23 | - **`queryKey` (required)**: A unique label for your query, used for caching and refetching.
24 | - **`queryFn` (required)**: The function responsible for fetching data (should be asynchronous).
25 | 
26 | ### Example Usage of `useQuery`:
27 | 
28 |         import { useQuery } from 'react-query';
29 |         import axios from 'axios';
30 | 
31 |         const fetchUsers = async () => {
32 |               const { data } = await axios.get('https://jsonplaceholder.typicode.com/users');
33 |               return data;
34 |             };
35 | 
36 |             const UsersList = () => {
37 |               const { data, error, isLoading } = useQuery(['users'], fetchUsers);
38 | 
39 |               if (isLoading) return <p>Loading...</p>;
40 |               if (error) return <p>Error fetching data</p>;
41 | 
42 |               return (
43 |                 <ul>
44 |                   {data.map(user => (
45 |                     <li key={user.id}>{user.name}</li>
46 |                   ))}
47 |                 </ul>
48 |               );
49 |             };
50 | 
51 |             export default UsersList;
52 | 
53 | useMutation: Handling Data Mutations ✏️
54 | 
55 | For creating, updating, or deleting data, React Query provides the useMutation hook. Unlike useQuery, which is used for fetching data, useMutation is used for modifying server-side data.
56 | 
57 | Example Usage of useMutation:
58 | 
59 |             import { useMutation, useQueryClient } from 'react-query';
60 |             import axios from 'axios';
61 | 
62 |             const addUser = async (newUser) => {
63 |               const { data } = await axios.post('https://jsonplaceholder.typicode.com/users', newUser);
64 |               return data;
65 |             };
66 | 
67 |             const AddUserForm = () => {
68 |               const queryClient = useQueryClient();
69 |               const mutation = useMutation(addUser, {
70 |                 onSuccess: () => {
71 |                   queryClient.invalidateQueries(['users']); // Refresh user list after adding
72 |                 }
73 |              });
74 | 
75 |               const handleSubmit = (e) => {
76 |                 e.preventDefault();
77 |                 const newUser = { name: e.target.name.value };
78 |                 mutation.mutate(newUser);
79 |               };
80 | 
81 |               return (
82 |                 <form onSubmit={handleSubmit}>
83 |                   <input name="name" placeholder="Enter name" required />
84 |                       <button type="submit">Add User</button>
85 |                 </form>
86 |               );
87 |             };
88 | 
89 |             export default AddUserForm;
90 | 
91 | Conclusion 🎉
92 | 
93 | React Query simplifies data fetching and state management in React applications. With built-in caching, background updates, and error handling, it significantly improves performance and user experience. Whether you're fetching, updating, or caching data, React Query is a must-have tool for modern web development!
94 | 
95 | Further Reading 📚
96 | 
97 | For a deeper dive into React Query, check out this comprehensive article on Medium: [React Query: The Ultimate Guide to Data Fetching in React.](https://medium.com/@designweb.azadeh/react-query-supercharge-your-react-app-with-react-query-962a38f1cd79)
98 | 
99 | 


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