<% if (message.lenght > 0) { %>
                    <p><%= message%></p>
                <% }%>
                <br>
                <form action="/signup" method="POST">
                    <div class="form-group">
                        <div class="form-row">
                            <div class="col">
                                <label for="first_name">First name</label>
                                <input type="text" name="first_name" class="form-control" placeholder="John">
                            </div>
                            <div class="col">
                                 <label for="last_name">Last name</label>
                                <input type="text" name="last_name" class="form-control" placeholder="Doe">
                            </div>
                        </div>
                    </div>
                    <div class="form-group">
                        <label for="username">Username</label>
                        <input type="text" name="username" class="form-control" placeholder="JohnDoe123">
                    </div>
                    <div class="form-group">
                        <label for="email">Email</label>
                        <input type="email" name="email" class="form-control" placeholder="example@example.com">
                    </div>
                    <div class="form-group">
                        <label for="password">Password</label>
                        <input type="password" name="password" class="form-control" placeholder="******">
                    </div>
                    <input type="submit" value="Sign in!" class="btn btn-dark btn-lg">
                    <hr>
                    <div style="text-align: center">
                        <p>Already have an account? <a href="/signin">Sign up!</a></p>
                        <p>or go <a href="/">Home</a></p>
                    </div>
                </form>

app.get('/signup', (req, res) => {
    res.render('signup', {message: req.flash('error_msg')});
});

app.post('/signup', (req, res) => {
    var first_name = req.body.first_name;
    var last_name = req.body.last_name;
    var username = req.body.username
    var email = req.body.email;
    var password = req.body.password;

    var newUser = new User({
        first_name: first_name,
        last_name: last_name,
        username: username,
        email: email,
        password: password
    });

    User.findOne({username: newUser.username}, (err, username) => {
        if (err) throw err;
        if (username) {
            console.log('Username already taken');
            req.flash('error_msg', 'Username already taken!');
        }
        if (!username) {
            User.findOne({email: newUser.email}, (err, email) => {
                if (err) throw err;
                if (email) {
                    req.flash('error_msg', 'email already taken!');
                    console.log(req.flash('error_msg'))
                }
                if (!email) {
                    User.createUser(newUser, (err, user) => {
                        res.redirect('profile');
                        console.log(user);
                    })
                }
            });
        }
    });
});

res.render('signup', {message: req.flash('error_msg')});

let message=!JSON.stringify('message')

res.send({message: req.flash('error_msg')});

res.json({message: req.flash('error_msg')});