var mongo = require('mongodb');
var monk = require('monk');
var db = monk('localhost:27017/mydb');
var collection = db.get('tweets');
collection.count()

collection.count({}, function (error, count) {
  console.log(error, count);
});

var monk = require('monk');
var wrap = require('co-monk');
var db = monk('localhost/test');
var users = wrap(db.get('users'));
var numberOfUsers = yield users.count({});