Can't connect to mongodb from node.js

Question

I am trying to write a piece of code to connect to mongodb database from node.js using the 'mongodb' library.

here is a piece of code describing what im trying to achieve:

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, Grid = require('mongodb').Grid, Code = require('mongodb').Code, assert = require('assert'); var User = require('mongo-bcrypt-user'); // Set up the connection to the local db var mongoclient = new MongoClient(new Server("localhost", 27017), {native_parser: true}); var db = mongoclient.db("test"); var coll = db.collection('users');

when trying to run the file im getting the following error:

D:\mongodb.js:15 var db = mongoclient.db("test"); ^ TypeError: undefined is not a function at Object.<anonymous> (D:\Backups\C Drive New Backup\temp\mongodb.js:15:24) at Module._compile (module.js:460:26) at Object.Module._extensions..js (module.js:478:10) at Module.load (module.js:355:32) at Function.Module._load (module.js:310:12) at Module.require (module.js:365:17) at require (module.js:384:17) at Object.<anonymous> (D:\Backups\C Drive New Backup\temp\MyWebAPI.js:8:20) at Module._compile (module.js:460:26) at Object.Module._extensions..js (module.js:478:10)

Thanks in advance :]

There are documentation examples to this. And reading them and other nodejs related things should at least tip to you that this is "asynchronous programming". — Blakes Seven
– Blakes Seven, Commented Aug 14, 2015 at 9:09
possible duplicate of How to return the response from an asynchronous call? — Blakes Seven
– Blakes Seven, Commented Aug 14, 2015 at 9:10

krl · Accepted Answer · 2015-08-14 10:37:31Z

MongoClient doesn't have db method: http://mongodb.github.io/node-mongodb-native/2.0/api/MongoClient.html

It has connect(url, options, callback) method, where callback is connectCallback(error, db) function, so your code must look like this:

var mongoclient = new MongoClient('mongodb://localhost:27017', {native_parser: true}, function(error, db) { // use db here });

Pay attention to concepts of asynchronous programming in JavaScript. Namely callback and promises.

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