user route file

// post the signup form
function signupValidation(req, res, next) {
    "use strict";
    // grabe the form values
    var username = req.body.username;
    var email = req.body.email;
    var number = req.body.number;
    var password = req.body.password;
    var confirmpassword = req.body.confirmpassword;
        // check fields with validator
        req.checkBody("username", "username is required").notEmpty();
        req.checkBody("email", "email is required").notEmpty();
        req.checkBody("email", "invalid email").isEmail();
        req.checkBody("password", "password is required").notEmpty();
        req.checkBody("password", "password should containes 5 character at least").isLength({min: 5});
        req.checkBody("password", "password should contains at least one number").matches(/^(?=.*\d)(?=.*[a-z])[0-9a-z]{5,}$/, "i");
        req.checkBody("confirmpassword", "password sies not match").equals(req.body.password);
        //req.checkBody("profileimage", "profile image is required").notEmpty();
        // errors
        var errors = req.validationErrors();
        if (errors) {
            res.render("users/buyers/signup", {
                errors: errors,
                username: username,
                email: email,
                password: password,
                confirmpassword: confirmpassword
            });
        } else {
            next();
        }
}

router.post("/signup", signupValidation, passport.authenticate("local.signup", {
        //successRedirect: "/buyer/profile",
        failureRedirect: "/buyer/signup",
        failureFlash: true
}), function (req, res, next) {
    var newUser = new Buyer({
        username: req.body.username,
        email: req.body.email,
        password: req.body.password,
        confirmpassword: req.body.confirmpassword
    });
    newUser.save().then(res.redirect("/buyer/profile"));
    });