testMongoDB.js

const MongoClient = require('mongodb').MongoClient;
const url = "mongodb://localhost:27017/";

MongoClient.connect(url, {useNewUrlParser: true}, function (err, db) { 
  if (err) throw err;


  const 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(); 
  });
});