Connecting To MongoDB From Node.js Beginner's Basic

Ok guys - Here we will create a simple file that will connect to a local instance of Mongo and read data from the 'test' database.

Assumptions - 

1 - A local Mongo server is running at port 27017 (default port)

Step 0 - Create a directory called 'testing' and cd into it.

Step 1 - Connect to mongo using a mongo shell

Step 2 -  Add some data to a collection named 'heroes' in the test db.

              use test

             db.heroes.insert([{name: 'Super Man'}, {name: 'Bat Man'}]) 

Step 3 - Create a file called simple_connect.js and the following content to the file

             

	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();
	});
	});

view raw simple_connect.js hosted with ❤ by GitHub

Step 4 - If you haven't already installed the 'mongodb' module, run

             npm install mongodb

Step 4 - Run

             node simple_connect.js