section28.3.md

Section 28.3: Connect to MongoDB

Connect to MongoDB, print 'Connected!' and close the connection.

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

MongoClient.connect(url, function(err, db) { // MongoClient method 'connect'
  if (err) throw new Error(err);
  console.log("Connected!");
  db.close(); // Don't forget to close the connection when you are done
});

MongoClient method Connect()

MongoClient.connect(url, options, callback);

Argument	Type	Description
url	string	A string specifying the server ip/hostname, port and database.
options	object	(optional) Optional settings (default: null)
callback	Function	Function to be called when the connection attempt is done

The callback function takes two arguments

• err : Error - If an error occurs the err argument will be defined
• db : object - The MongoDB instance