Retreive users from mean.io database (i.e. retrieve data from mongoDB via mongoose)

gistfile1.txt

//require mongoose node module
var mongoose = require('mongoose');

//connect to local mongodb database
var db = mongoose.connect('mongodb://127.0.0.1:27017/mean-dev');

//attach lister to connected event
mongoose.connection.once('connected', function() {
  console.log("Connected to database")
});

var schema = new mongoose.Schema({ username: 'string' });
var Users = mongoose.model('users', schema);
var a = Users.find(function(err, users) {
      mongoose.connection.close();
      // console.log(users);
      for (var i in users){
          console.log(users[i]['username']);
      }
    })