var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://:27017/mydb";

MongoClient.connect(url, function(err, db) {
  if (err) throw err;
  //Return only the "name" field in the result:
  db.collection("customers").find({}, { projection: { _id: 0, name: 1 } }).toArray(function(err, result) {
    if (err) throw err;
    console.log(result);
    db.close();
  });
});