Connecting To MongoDB From Node.js Beginner's Basic

simple_connect.js

var MongoClient = require('mongodb').MongoClient;
var connectionString = 'mongodb://localhost:27017/test';
// connect to test db
MongoClient.connect(connectionString, function(err, db) {
  if(err) throw err;
  console.log("CONNECTED");
  
  var q = {name: 'Super Man'};
  
  // query superheroes collection and display result
  db.collection('heroes').findOne(q,function(err, doc) {
    if(err) throw err;
    console.dir(doc);
    db.close();
  });
});