passport.js file

passport.use("local.signup", new LocalStrategy({
    usernameField: "email",
    passwordField: "password",
    passReqToCallback: true
}, function (req, email, password, done) {
    "use stirct";
    Buyer.findOne({"email": email}, function (err, user) {
        if (err) {
            return done(err);
        }
        if (user) {
            return done(null, false, {message: "email is already in use"});
        }
        var newUser = new Buyer();
        newUser.username = req.body.username;
        newUser.email = req.body.email;
        newUser.password = newUser.encryptPassword(req.body.password);
        newUser.confirmpassword = newUser.encryptPassword(req.body.confirmpassword);
        newUser.profileimage = req.file.profileimage;
        newUser.save(function (err, result) {
            if (err) {
                return done(err);
            }
            return done(null, newUser);
        });
    });
}));