Getting Started with React Query

Here is a short tutorial on how to use React Query in a React application:

Step 1: Install React Query

You can install React Query using either Yarn or NPM. To install it using Yarn, run the following command:

csharpCopy codeyarn add react-query

To install it using NPM, run the following command:

graphqlCopy codenpm install react-query

Step 2: Configure React Query

In your root component, import the ReactQueryClientProvider component from react-query and wrap your application with it. You can also configure the default options for React Query, such as the cache time and the default error handling behavior.

javascriptCopy codeimport { ReactQueryClientProvider, QueryClient, QueryClientProvider } from 'react-query';

const queryClient = new QueryClient();

function App() {
  return (
    <QueryClientProvider client={queryClient}>
      {/* your app code */}
    </QueryClientProvider>
  );
}

Step 3: Use useQuery to Fetch Data

In your component, import the useQuery hook from react-query. Use it to fetch data from an API endpoint and return the result to your component.

javascriptCopy codeimport { useQuery } from 'react-query';

function MyComponent() {
  const { data, error, isLoading } = useQuery('todos', fetchTodos);

  if (isLoading) {
    return <div>Loading...</div>;
  }

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

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

In this example, the useQuery hook fetches data from an API endpoint called fetchTodos and returns the result to the MyComponent component. The data, error, and isLoading variables are used to render the component based on the state of the query.

Step 4: Use useMutation to Update Data

In your component, import the useMutation hook from react-query. Use it to send data to an API endpoint and update the cache with the new data.

javascriptCopy codeimport { useMutation } from 'react-query';

function MyComponent() {
  const [mutate, { data, error, isLoading }] = useMutation(createTodo);

  const handleSubmit = (event) => {
    event.preventDefault();
    mutate({ title: event.target.title.value });
  };

  return (
    <div>
      <form onSubmit={handleSubmit}>
        <input name="title" placeholder="New Todo" />
        <button type="submit">Add</button>
      </form>
    </div>
  );
}

In this example, the useMutation hook sends data to an API endpoint called createTodo and updates the cache with the new data. The mutate function is called when the form is submitted, passing in the new todo data as an object.

Conclusion

React Query is a powerful library for managing remote data in a React application. It provides many features that can improve the performance, reliability, and usability of your application. By following these steps, you can easily get started with React Query and start building great applications.