How can I implement authentication with React Query for protected routes?

How can I implement authentication with React Query for protected routes?

You can use React Query to manage your data fetching and caching, while implementing authentication by checking user tokens before accessing protected routes.

What libraries do I need to use for authentication?

You can use libraries like react-router for routing and axios for making API calls. Additionally, consider using jsonwebtoken for handling tokens.

Can you give me a code example?

Sure! Here's a simple example:

import { useQuery } from 'react-query';
import { useHistory } from 'react-router-dom';

const fetchProtectedData = async () => {
  const response = await axios.get('/protected-route', {
    headers: { Authorization: `Bearer ${localStorage.getItem('token')}` }
  });
  return response.data;
};

const ProtectedComponent = () => {
  const history = useHistory();
  const { data, error } = useQuery('protectedData', fetchProtectedData);

  if (error) {
    history.push('/login'); // Redirect to login if there's an error
  }

  return <div>{data}</div>;
};

This checks for a token and redirects to login if not authenticated.

What if I want to refresh the token?

You can implement a refresh token mechanism by creating an API endpoint that issues a new token when the old one is about to expire. Use a setInterval to check the token's validity and refresh it as needed.