// config/database.js
module.exports = {

  'url' : 'mongodb://max:Max15051992@ds031417.mongolab.com:31417/harborjs' //like mongodb://<user>:<pass>.ds000000.mongolab.com:27017/mydb

};

// config/database.js
module.exports = {

  'url' : '' //like mongodb://<user>:<pass>.ds000000.mongolab.com:27017/mydb

};

Update database.js