Testing the codument size with embedded array of 30000 Object ids

documentsize.js

var mongoose = require('mongoose');

mongoose.connect('mongodb://localhost:27017/my_databasetest');

var Schema = mongoose.Schema;
var ObjectId = Schema.Types.ObjectId;

var UserSchema = new Schema({
  name: String,
  friends: [{type: ObjectId}]
});

var User = mongoose.model('User', UserSchema);

var user = new User({ name: 'tes' });

for (var i = 0 ; i < 30000; ++i ){
  user.friends.push(new mongoose.Types.ObjectId());  
}


user.save(function (err) {
  if (!err) {
    console.log((JSON.stringify(user).length)/1024);
    User.findOne({},function(err,user){
    });
  }else{
    console.log(err);
  }
});

// RESULT
// the size was 791.08 KB for 30000 OBject ids