Detect if the user was authenticated before

For the route /moderator/ I need to check if the user is already authenticated. If the user is authenticated, I need to redirect the user to /moderator/index.html. If the user is not authenticated, I need to redirect the user to /moderator/login.html.

I have been reading documentation but could not get enough from it.

So, the login.html page has a form containing username and password field and the route for this (the form) has been defined as follows:

 this.router.post('/login/:usertype', passport.authenticate('local-user')
   ,(req, resp) => 
 {
    // Verified!!
 });

I also read a post here at SO, but won't the request object change with a new request?

PS: I am not using any session module till now.

via Suhail Gupta