If the session cannot be located, users will be redirected to the sign-in page

I have a small application that utilizes next-auth to display a signin/signout button based on the user's sign-in status. The buttons function correctly and redirect me to the signin page when clicked.

However, I am wondering how can I automatically redirect to the signin page if not signed in?

I attempted to add signIn() within the if(session)... block, but this resulted in the error:

ReferenceError: window is not defined

I also tried using router.push('/api/auth/signin'), but encountered the following error:

Error: No router instance found. You should only use "next/router" inside the client-side of your app. https://nextjs.org/docs/messages/no-router-instance

import React from "react";
import { useSession, signIn, signOut } from "next-auth/client";
import { useRouter } from 'next/router'
export default function Home() {

  const [session, loading] = useSession();
  const router = useRouter()

  if (session) {
    console.log("session = true")
    router.push('/blogs')
    return (
      <>
        Signed in as {session.user.name} <br />
        <button onClick={() => signOut()}>Sign out</button>
      </>
    );
  }
  console.log("session = false")
 
  return (
    <>
      Not signed in <br />
      <button onClick={() => signIn()}>Sign in</button>
    </> 
  );
}

Answer №1

Ensure that you place the code within the useEffect function so that it executes only on the client side when the component is mounted. Additionally, make sure to wait until the loading variable switches to false before checking the value of the session variable.

useEffect(()=>{
  if(!loading){
    if (session) {
      console.log("session = true")
      router.push('/blogs')
    }else{
      // consider redirecting to the login page
      router.push('/login')
  }
 }
},[router,session])

Furthermore, refer to this post on How to protect routes in Next.js next-auth? for a comprehensive solution involving pages for both login and logout.

Answer №2

If you're tirelessly searching on Google to find the solution, here's how I tackled it.

Inside your component file:

import { useEffect} from "react";
import { useSession } from "next-auth/react";
import { signIn} from "next-auth/react";

export const myComponent = () => {
    
    const { data: sessionData } = useSession();
    const { status: sessionStatus } = useSession();
    
    useEffect(() => {            
        console.log(sessionStatus);
        if (sessionStatus === "unauthenticated") {
            void signIn('azure-ad'); //Customize with your own provider
        }              
    }, [sessionStatus])

    //Other component code

}

Your page will load on the client-side and initiate session initialization. Initially, the status will be "loading", which does not require specific handling. After a brief moment, the status will change to either "authenticated" or "unauthenticated", allowing you to take action accordingly. If your goal is to redirect users who are not logged in, simply invoke the signIn function.

Ensure to include controls on your page that disable sensitive data and buttons when

sessionStatus !== "authenticated"
, as the page will be visible upon rendering.

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