io.on('connection', function (socket) {

    app.post('/signup', function(req, res) {

    var userDetails = User({
        firstname: req.body.firstname,
        username: req.body.username,
        email: req.body.email,
        password: bcrypt.hashSync(req.body.password1, bcrypt.genSaltSync(10))
    });

    User.findOne({
        $or: [ { 'username': req.body.username}, {'email': req.body.email}]
    }, function(err, user) {
        if (user) {
              if(user.username === req.body.username){
              socket.emit('news', 'username taken');
              console.log('username is taken');
            } else {
            }
            if(user.email === req.body.email){
              socket.emit('news', 'email taken');
              console.log('email is taken')
            } else {
            }
        } else {
          userDetails.save(function(err) {
            if (err) throw err;
          });
          res.redirect('/');
          console.log('change to login')
        }
        if (err) {
            return done(err);
        }
    });

   });

});