How can I handle authentication errors in React Query?

How can I handle authentication errors in React Query?

You can handle authentication errors in React Query by using the onError callback in your query or mutation. This allows you to catch errors and respond accordingly.

Can you show me an example of using the onError callback?

Sure! Here's a simple example:

const { data, error } = useQuery('user', fetchUser, {
  onError: (error) => {
    if (error.response.status === 401) {
      // Handle unauthorized access
      console.log('User is not authenticated');
    }
  },
});

What if I want to redirect the user to a login page?

You can use the onError callback to redirect the user. For example:

onError: (error) => {
  if (error.response.status === 401) {
    window.location.href = '/login';
  }
},

Are there any best practices for error handling in React Query?

Yes, some best practices include centralizing error handling, providing user feedback, and logging errors for debugging.