var MongoDB = require('mongodb');

var url = 'mongodb://<user>:<password>@<my-db-url>';
var mongoOptions = {
  db: { safe: true, native_parser: false },
  server: { autoReconnect: true, reconnectTries: Infinity },
  replSet: {}
};

var cb = function (e, r) { console.log('error:', e, 'res', r); };

MongoDB.connect(
  url,
  mongoOptions,
  cb
);