Login function with express-validator

nodejs passport authenticate

  function postLogin(req, res, next){
    req.assert('username', 'username is required').notEmpty();
    req.assert('password', 'password is required').notEmpty();
    var username = (req.body.username)? req.body.username: '';
    var password = (req.body.password)? req.body.password: '';
    
    var errors = req.validationErrors(true);
    if (errors) {
      res.render('login.jade', {locals: { title: 'Login Error', username: username, password: password, errors: errors}});
      return;
    };

    passport.authenticate('local', function(err, user, info) {
        if (err) { return next(err) }
        
        ...
        ...