What is the method for verifying authentication status on a Next.js page?

I'm struggling to understand why the call to auth.currentUser in the code snippet below always returns null. Interestingly, I have another component that can detect when a user is logged in correctly.

import { auth } from "../lib/firebase";

type Props = {
  message: string;
};

const Page = ({ message }: Props) => {
  useEffect(() => { 
    if (auth.currentUser) { // The condition never evaluates to true
      const router = useRouter();
      router.push("/home");
    }
  }, []);

  return <div>{message}</div>
}

export default Page;

export const getStaticProps = async () => {
  const message = await fetchMessage();

  return {
    props: { message },
  };
};

Answer №1

According to the documentation, the currentUser property in Firebase is null when there is uncertainty about a signed-in user. When a web page loads initially, it starts with a null value and does not automatically populate with a previously signed-in user object. To know when the user object becomes available, you need to use an auth state observer, as mentioned in your code.

Determining the signed-in user may take some time and can vary. For more information on why currentUser might unexpectedly be null, you can refer to this informative blog post: Why Is My currentUser Null in Firebase Auth?.

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