React Query as State manager

HOW TO USE REACT QUERY AS STATE MANAGER IN REACT JS APPLICATION

React JS, Blog, React Query / By / July 25, 2024

A Guide to React Query: Simplifying State Management and Data Fetching in React Applications

Introduction to React Query

React Query is a powerful library that provides a efficient way to manage your application state in React applications. It is developed to handle asynchronous data fetching and caching, making it easier to work with server data in a React application.

Benefits of Using React Query for State Management

  1. Simplified Data Fetching: Process of fetching data from APIs and other data sources becomes very easy by using react query. React Query comes with a declarative API that makes you to easily define data fetching logic and handle loading, error, and success states.
  2. Caching and Data Management: React Query automatically caches the fetched data, reducing the need for redundant API calls. It also provides mechanisms to manage and invalidate the cache when necessary, ensuring that your application always has the most up-to-date data.
  3. Optimized Rendering: React Query optimizes rendering by only re-rendering components when the relevant data changes. It uses a smart caching mechanism that updates the UI efficiently, resulting in better performance and improved user experience.
  4. Query Invalidation and Refetching: React Query allows you to easily invalidate and refetch queries when data changes. This is especially useful in scenarios where you need to update the UI in response to user actions or external events.
  5. Integration with React Ecosystem: React Query seamlessly integrates with other libraries and tools in the React ecosystem. It works well with React Router, allowing you to fetch data based on the current route. It also supports server-side rendering and works with popular state management libraries like Redux and MobX.

Getting Started with React Query

To start using React Query in your React application, Please follow the given steps

Step 1: Install React Query

The first step is to install React Query in your React JS project. You can do this by running the following command in your project directory:

npm install react-query

This will install React Query and its dependencies in your project.

Step 2: Set up a Query Client

Next, you need to set up a Query Client in your application. The Query Client is responsible for managing the caching and fetching of data. You can create a Query Client by importing the `QueryClient` and `QueryClientProvider` from the `react-query` package.

import { QueryClient, QueryClientProvider } from 'react-query';

const queryClient = new QueryClient();

function App() {
  return (
    
      {/* Your application components */}
    
  );
}

Wrap your application components with the `QueryClientProvider` component and pass the `queryClient` instance as a prop. This will make the Query Client available to all components in your application.

Step 3: Fetch Data with React Query

Now that you have set up the Query Client, you can start fetching data using React Query. React Query provides a `useQuery` hook that makes it easy to fetch and cache data from an API. Here’s an example of how to use the `useQuery` hook:

import { useQuery } from 'react-query';

function Users() {
  const { data, isLoading, error } = useQuery('users', () =>
    fetch('/api/users').then((res) => res.json())
  );

  if (isLoading) {
    return 'Loading...';
  }

  if (error) {
    return error.message;
  }

  return (
    <div>
      {
        data.map((user) => (
          user.name

        ))
      }
    </div>
  );
}

In the above example, the `useQuery` hook is used to fetch a list of users from the `/api/users` endpoint. The `data` variable contains the fetched data, `isLoading` indicates whether the data is still being fetched, and `error` contains any error that occurred during the fetch.

You can also pass additional options to the `useQuery` hook, such as `staleTime` to control how long the data should be considered fresh, and `cacheTime` to control how long the data should be cached.

Step 4: Update Data with React Query

React Query also provides a `useMutation` hook that makes it easy to update data. The `useMutation` hook returns a mutation function that you can use to perform the update. Here’s an example of how to use the `useMutation` hook:

import { useMutation } from 'react-query';

function AddUser() {
  const mutation = useMutation((user) =>
    fetch('/api/users', {
      method: 'POST',
      body: JSON.stringify(user),
    }).then((res) => res.json())
  );

  const handleSubmit = (event) => {
    event.preventDefault();
    const formData = new FormData(event.target);
    const user = Object.fromEntries(formData.entries());
    mutation.mutate(user);
  };

  return (
    
  );
}

In the above example, the `useMutation` hook is used to perform a POST request to the `/api/users` endpoint to add a new user. The `mutation` variable contains the mutation function, which can be called with the user data to perform the update.

The `mutation` object also provides useful properties like `isLoading` to indicate whether the mutation is in progress, `isError` to check if an error occurred during the mutation, and `error` to access the error message.

Conclusion

React Query is a powerful state management library that simplifies data fetching and caching in React applications. It provides a declarative API, caching mechanisms, and optimized rendering, making it easier to work with server data. By using React Query, you can improve the performance and user experience of your React applications.

Some Useful Link:
How to setup react project using create react app – https://tekody.com/blogs/setup-react-project-using-create-react-app/

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