User.get({username: req.body.username}, function(err, user) {
    if(err) {return console.log(err);}

    if(user) {
      res.status(404).json({error: ["Username already exist."]});
    } else {
        var user = new User({username: req.body.username, provider: 'local', email: req.body.email, password: bcrypt.hashSync(req.body.password, 10)});

        user.put(function(err, success){
          if(err) {return console.log(err)}

          var token = jwt.encode(user, 'lkmaspokjsafpaoske1a8asda0s9a');
          res.json({token: token, user: user});
        });
      }
  });