server.js
/* eslint-disable @typescript-eslint/no-require-imports */
const next = require('next');
const express = require('express');

const dev = process.env.NODE_ENV !== 'production';
const app = next({ dev });
const handle = app.getRequestHandler();

app.prepare().then(() => {
  const server = express();

  // Set NEXTAUTH_URL dynamically
  server.use((req, res, next) => {
    if (!process.env.NEXTAUTH_URL) {
      process.env.NEXTAUTH_URL = dev
        ? 'http://localhost:3000'
        : `https://${req.headers.host}`;
    }
    next();
  });

  server.all('*', (req, res) => {
    return handle(req, res);
  });

  const port = process.env.PORT || 3000;
  server.listen(port, (err) => {
    if (err) throw err;
    console.log(`> Ready on http://localhost:${port}`);
  });
}).catch((err) => {
  console.error('Error starting server:', err);
  process.exit(1);
});

 middleware.ts
//Src/middleware.ts
import { withAuth } from "next-auth/middleware";

export default withAuth({
  callbacks: {
    authorized: ({ token, req }) => {

      // Let login page be public
      if (req.nextUrl.pathname === "/dashboard/login") {
        return true;
      }
      // Otherwise require a valid session
      return !!token;
    },
  },
  pages: {
    signIn: "/dashboard/login",
  },
});

export const config = {
  matcher: [
    "/dashboard/:path*",
    "/api/admin/:path*",
  ],
};