How to implement login/authorization with express js?

Question

JavaScript

Good day to all.
I am doing a project on express, it remains for me to implement authorization.
my html/ejs with login :

<%= errr %>
<form class="form-signin"id="log form" type='post' action="/login/">
        <h2 class="form-signin-heading">Вход в систему</h2>
        <input type="text" class="form-control" name="usernames" placeholder="Логин" required autofocus=""  autocomplete="off"/>
        <input type="password" class="form-control" name="password" placeholder="Пароль" required autocomplete="off"/>

        <button id="send" type='submit' class="btn btn-lg btn-primary btn-block" >Вход</button>
    </form>

I do the following in routes:

router.post('/login/', function (req, res, next) {
    var log_user =  req.body.usernames;
     var log_passw = req.body.password

   if(log_user == user_one && log_passw  == passw_one ){
               res.render('index_one',{some_data:'this_user_data'})
   }else if(log_user == user_second && log_passw  == passw_second ) {
               res.render('index_second',{some_data:'this_user_data'})
    }else{
               а что написать здесь, чтобы  оповестить пользователя об ошибке и оставить его на странице входа?  }
})

Or can the data from the form be sent via ajax? but will the jump to index.ejs be made on successful login?

Answer 1

You do not want to take a ready-made solution ?
In a template with a login, it makes sense to display the login in the login input field for the convenience of the user.

Answer 2

Hmm ... I did what you advised, it works, but there is one BUT!
After a successful user login, if you click on the "back" button / arrow in the browser, you go to the previous page, with entering a password and login, and if you now click on the "forward" button / arrow here, then you enter without entering a login and password.
Is it some kind of browser cache? how to deal with it?