Connect node with mongo

connect-mongo.js

var Db = require('mongodb').Db,
    MongoClient = require('mongodb').MongoClient,
    Server = require('mongodb').Server,
    ReplSetServers = require('mongodb').ReplSetServers,
    ObjectID = require('mongodb').ObjectID,
    Binary = require('mongodb').Binary,
    GridStore = require('mongodb').GridStore,
    Code = require('mongodb').Code,
    BSON = require('mongodb').pure().BSON,
    assert = require('assert');

var db = new Db('integration_tests', new Server("127.0.0.1", 27017, {
    auto_reconnect: false,
    poolSize: 4
}), {
    w: 0,
    native_parser: false
});

// Establish connection to db
db.open(function(err, db) {
    assert.equal(null, err);

    // Add a user to the database
    db.addUser('user', 'name', function(err, result) {
        assert.equal(null, err);

        // Authenticate
        db.authenticate('user', 'name', function(err, result) {
            assert.equal(true, result);
            db.close();
        });
    });
});