logicloom-nextjs-starter/src/middleware.ts

A production-ready Next.js starter template with authentication, i18n, dark mode, and modern patterns

import { NextResponse } from "next/server";
import type { NextRequest } from "next/server";

export function middleware(request: NextRequest) {
  const { pathname } = request.nextUrl;

  // Check if user has auth token (from cookies)
  const authToken = request.cookies.get("auth_token");
  const isAuthenticated = !!authToken?.value;

  // If user is authenticated and trying to access /auth page, redirect to home
  if (isAuthenticated && pathname === "/auth") {
    return NextResponse.redirect(new URL("/", request.url));
  }

  // If user is not authenticated and trying to access protected routes, redirect to auth
  // You can add more protected routes here if needed
  const protectedRoutes = ["/dashboard", "/profile", "/settings"];
  const isProtectedRoute = protectedRoutes.some((route) =>
    pathname.startsWith(route)
  );

  if (!isAuthenticated && isProtectedRoute) {
    return NextResponse.redirect(new URL("/auth", request.url));
  }

  return NextResponse.next();
}

// Configure which paths the middleware should run on
export const config = {
  matcher: [
    /*
     * Match all request paths except for the ones starting with:
     * - api (API routes)
     * - _next/static (static files)
     * - _next/image (image optimization files)
     * - favicon.ico, sitemap.xml, robots.txt (metadata files)
     */
    "/((?!api|_next/static|_next/image|favicon.ico|sitemap.xml|robots.txt).*)",
  ],
};