NextJs - Console log is not logging in server

Question

i am trying to make an auth in nextjs. and in the root middleware.ts i have this:

import { auth } from "./auth";

export default auth((req) => {
    const isLoggedIn = !!req.auth;
    console.log("Is Logged In: ", isLoggedIn);
});

export const config = {
    matcher: [
        // Skip Next.js internals and all static files, unless found in search params
        '/((?!_next|[^?]*\\.(?:html?|css|js(?!on)|jpe?g|webp|png|gif|svg|ttf|woff2?|ico|csv|docx?|xlsx?|zip|webmanifest)).*)',
        // Always run for API routes
        '/(api|trpc)(.*)',
    ],
};

i have been following this https://authjs.dev/getting-started/installation?framework=next-js and using latest nextjs.

now the problem is when i just refresh the /auth/login route. i am expecting this:

console.log("Is Logged In: ", isLoggedIn);

to make log on the server terminal but its not, its just

 ✓ Ready in 3.2s
 ○ Compiling /auth/register ...
 ✓ Compiled /auth/register in 3.3s (735 modules)
 ✓ Compiled in 970ms (340 modules)
 GET /auth/register 200 in 4384ms
 ○ Compiling /auth/login ...
 ✓ Compiled /auth/login in 760ms (733 modules)
 GET /auth/login 200 in 885ms
 GET /auth/register 200 in 32ms

do you have any idea?

i am new to nextjs, so this is a little challenge

Vadeen · Accepted Answer · 2025-02-05 16:58:18Z

You need to export a function called middleware, see the example in the documentation: https://nextjs.org/docs/app/building-your-application/routing/middleware#convention

You are exporting the result of the call to auth(...) as the default export, which will not be recognized as a middleware by next.js.

In the documentation you provided, they do it like this:

export { auth as middleware } from "@/auth"

Which will export auth with the name middleware

Then you can't do your logging of course.

If I understand the signature of auth correctly, you should be able to do something like this to get your logging working:

import { auth } from "./auth";

export function middleware(request) {
    return auth((req) => {
        const isLoggedIn = !!req.auth;
        console.log("Is Logged In: ", isLoggedIn);
    })(request);
}

export const config = {
    matcher: [
        // Skip Next.js internals and all static files, unless found in search params
        '/((?!_next|[^?]*\\.(?:html?|css|js(?!on)|jpe?g|webp|png|gif|svg|ttf|woff2?|ico|csv|docx?|xlsx?|zip|webmanifest)).*)',
        // Always run for API routes
        '/(api|trpc)(.*)',
    ],
};

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