Middleware

Create middleware.ts file in root directory of your app.
(For example if you are using app router then at same level as app directory , if not then at src folder level)
Now copy the following code to secure the desired routes in your application.

middleware.ts

import { NextRequest, NextResponse } from "next/server";
import { getSession } from "redshield";
  
export async function middleware(request: NextRequest) {
    const url = request.nextUrl.clone();
    const session = await getSession();
    //if already authenticated then redirect back to desired page
    if (url.pathname === "/Auth") {
      if (session.status) {
      //add path where logged in user should be redirected
        url.pathname = "/";
        return NextResponse.redirect(url);
      } else {
        return NextResponse.next();
      }
    }
   //this redirects the users to auth page if not authenticated
    if (session.status) {
      return NextResponse.next();
    } else {
      url.pathname = "/Auth";
      return NextResponse.redirect(url);
    }
}
export const config = {
      //add routes in matcher array to protect them from unauthenticated users
    matcher: ["/", "/Auth" ],
};

Middleware

Congratulations! Your app now have authentication.