using mongodb with nodejs and angular js

This is a continuation of the tutorial started on node js angular and mongo db shown on
node js console tutorial

This is a final part of the node angular and mongodb tutorial.

So far each part of the whole process has been shown by far. This is a part showing how the data would be pulled and shown to the angular based page.

Mind you, in this tutorial, the page was getting the list from the hard coded array and that is simply changed to the array that is read from mongodb. That part can be hooked to other datasources like MsSQL server or MySQL or anything.

Using MongoDB in Node JS

1. Create a folder named node-mongo

2. install mongodb and express packages there

sudo npm install express
sudo npm install mongodb

*I will have another tutorial showing how to use the package manager using package.json. But for now just install the packages like the one I showed above.

3. create server.js in node-mongo folder and add the following content in it

var express = require('express');
var app = express();

//connection string for mongo
var mongoPath = "mongodb://localhost:27017/nodemongo";
//require mongo and get the client.
var mongoClient = require('mongodb').MongoClient;

//a router for the home page. "/" being the home page
app.get("/", function(request, response){
    response.sendFile(__dirname + "/views/home.html");

//a router for listening to /listcountries 
app.get("/listcountries", function(request, response){

    // mongo connection comes from here
    mongoClient.connect(mongoPath, function(error, database){
        var result = {};
        //once connected, then get the row from mongo database. find() would list all
        if (error) {
            result.message = "Connection error";
        } else {
            var collection = database.collection("countries");
            collection.find().toArray((err, listOfCountries)=>{

console.log("serving web on port 8080");

By now, most of the usages on this file would be easy to understand if you have followed the previous tutorials.

How to install mongo in the computer and how to add some collections to it and the like is beyond the scope of this tutorial and I assume you have already installed mongo on your system and have created a database and collection with it.

In the example above, I have used mongo database named nodemongo and collection countries

4. create a folder views in node-mongo

5. create a file home.html and add the following code in in it

<body ng-app="NodeMongoApp">
<h2>here you would unleash the science of listing countries</h2>
<div ng-controller="MongoController">
    <a href="#" ng-click="listCountries()">list countries</a>

    <ul ng-repeat="country in countries">

<script src=""></script>
    var app = angular.module("NodeMongoApp", []);
    app.controller("MongoController", function($scope, $http){
        $scope.listCountries = function() {
                $scope.countries = countries.list;    

That is it.

Now you will want to be in the node-mongo folder and issue

node server.js

and from your browser, go to http://localhost:8080

You can download the whole project here

error = MongoId not found in symfony application

I got the MongoId not found error on the the application I recently moved to remote server.
The app is working fine locally and the problem appears to happen on the remote one only.
The problem seems obvious, and I checked the mongo version I have locally vs the version I have on the remote – they are different

I have newer version of mongo installed on the remote server. And the doctrine orm handling my mongo objects was also older.
I updated my doctrie orm on composer as

 "doctrine/orm": "2.4.6",

This took care of the problem – at least for now 😉

soft rlimits too low error on mongo

This is typical memory issue. Are you running a bunch of heavy programs along side? Check how much pages you are loading on chrome even.. and your IDE..

There is a way to add more before you start mongod though

ulimit -n 2000 && mongod

But I am a fan of using the resource effectively by removing apps that takes up my memory..