cb-mongoose-1.js

var User = require('route/to/models/User.js');

// Find a user by his ID
User.findById(<here_the_id>, function (error, user) {

   if (error) throw error;

   console.log(user);

});

// create a user
var user = new User({name: 'myusername'});
user.save(function(error) {

   if (error) throw error;

   console.log(user saved!);
});