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

MongoClient.connect(url, function(err, db) {
  if (err) throw err;
  let dbo = db.db("mydb");
  //Insert 3 documents, with specified id values:
  let myobj = [
    { _id: 154, name: 'Chocolate Heaven'},
    { _id: 155, name: 'Tasty Lemon'},
    { _id: 156, name: 'Vanilla Dream'}
  ];
  dbo.collection("products").insertMany(myobj, function(err, res) {
    if (err) throw err;
    //Return the result object:
    console.log(res);
    db.close();
  });
});