var MongoClient = require('mongodb').MongoClient;

var url = "mongodb://localhost:27017/";

​

MongoClient.connect(url, function(err, db) {

  if (err) throw err;

  var dbo = db.db("mydb");

  //Create a collection name "customers":

  dbo.createCollection("customers", function(err, res) {

    if (err) throw err;

    console.log("Collection created!");

    db.close();

  });

});

​