[next-auth][error][client_fetch_error]

The error “next-auth client_fetch_error” occurs when there is an issue with making a fetch request from the
client-side of a Next.js application using NextAuth.js for authentication and session management.

This error typically occurs due to one of the following reasons:

1. The NextAuth.js server endpoint is unreachable or throwing an error.
2. There is a network connectivity issue preventing the client from reaching the NextAuth.js server.
3. Cross-Origin Resource Sharing (CORS) is not properly configured on the NextAuth.js server.
4. The fetch request is being blocked by a Content Security Policy (CSP) directive.
5. An incorrect URL or configuration is being used to make the fetch request.

To resolve this error, you can take the following steps:

1. Check the logs and console output on the NextAuth.js server to identify any potential errors or issues.
2. Ensure that the NextAuth.js server endpoint is running and accessible.
3. Check your network connectivity and ensure that there are no firewalls or network restrictions blocking
   the fetch request.
4. Configure the NextAuth.js server to allow Cross-Origin Resource Sharing (CORS) if necessary. This can be
   done using the “cors” option in the NextAuth.js configuration.
5. Check the Content Security Policy (CSP) settings in your Next.js application and ensure that they are not
   blocking the fetch request. You may need to add appropriate directives to allow the fetch request.
6. Review the code making the fetch request and ensure that the URL and configuration are correct.

Here is an example of how a fetch request using NextAuth.js could be implemented in a Next.js application:

    import { useEffect } from 'react';
    import { signIn, signOut, useSession } from 'next-auth/client';

    export default function MyComponent() {
        const [session, loading] = useSession();

        useEffect(() => {
            const fetchData = async () => {
                try {
                    const response = await fetch('/api/auth/session');
                    const data = await response.json();
                    console.log(data);
                } catch (error) {
                    console.log(error);
                }
            };

            fetchData();
        }, []);

        if (loading) {
            return 
Loading...
;
        }

        if (!session) {
            return (
                

                    Not signed in! 

                    Sign in
                
            );
        }

        return (
            

                Signed in as {session.user.email} 

                Sign out
            
        );
    }
    

In this example, the fetch request is made to the “/api/auth/session” endpoint to fetch the user’s session
information. The response is logged to the console for demonstration purposes. Make sure to replace this URL
with your own NextAuth.js server endpoint.

Note that this is just a basic example, and you may have additional code and configuration depending on your
specific use case and requirements.