Setting up a MongoDB database connection with node.js

Question

How would I set up a MongoDB database connection with node.js?

Here is my app.js file:

var express = require('express'), app = express(), server = require('http').createServer(app), io = require('socket.io').listen(server); server.listen(3000); app.get('/', function(req, res) { res.sendfile(__dirname + '/index.htm'); }); app.use(express.static(__dirname + '/assets')); io.sockets.on('connection', function(socket) { socket.on('send message', function(data) { io.sockets.emit('new message', data); }); });

I have already set-up MongoDB and have it running as a service on Windows.

What have you tried? You checked the manual: mongodb.github.io/node-mongodb-native/api-articles/…? — Brad
– Brad, Commented Jul 27, 2013 at 7:23

Aleksandar Stojadinovic · Accepted Answer · 2014-05-04 00:07:30Z

As of 1.2, the recommended way to perform a connection is in documentation:

http://mongodb.github.io/node-mongodb-native/driver-articles/mongoclient.html

excerpt:

var MongoClient = require('mongodb').MongoClient , Server = require('mongodb').Server; var mongoClient = new MongoClient(new Server('localhost', 27017)); mongoClient.open(function(err, mongoClient) { var db1 = mongoClient.db("mydb"); mongoClient.close(); });

You may find that a connection singleton is useful for the current state of the official node.js driver. Below is some sample code that I use:

connection.js module:

var MongoClient = require('mongodb').MongoClient; var db_singleton = null; var getConnection= function getConnection(callback) { if (db_singleton) { callback(null,db_singleton); } else { //placeholder: modify this-should come from a configuration source var connURL = "mongodb://localhost:27017/test"; MongoClient.connect(connURL,function(err,db){ if(err) log("Error creating new connection "+err); else { db_singleton=db; log("created new connection"); } callback(err,db_singleton); return; }); } } module.exports = getConnection;

Referencing module:

var getConnection = require('yourpath/connection.js') function yourfunction() { getConnection(function(err,db) { //your callback code } . . . }

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