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MongoError: failed to connect to server [localhost:27017] on first connect [MongoError: connect ECONNREFU SED 127.0.0.1:27017]

My question is about mongo not connecting to the server?
and why is it saying that failed to connect to server [localhost:27017] on first connect [MongoError: connect ECONNREFU
SED 127.0.0.1:27017]
Here is my code:
var express = require("express"),
app = express(),
bodyParser = require("body-parser"),
mongoose = require("mongoose");
mongoose.connect("mongodb://localhost/BlogApp");
app.set("views engine", "ejs");
app.use(express.static("public"));
app.use(bodyParser.urlencoded({extended: true}));
app.get('/', function (req, res) {
res.send('Hello World!')
});
app.listen(3000, function () {
console.log('Example app listening on port 3000!')
});

Install mongodb on your machine, (If you're on a mac, run brew install mongodb), then open a new terminal, and run mongod, then relaunch your app

Make sure MongoDB is properly installed on your computer
Turn on your MongoDB by typing mongod or sudo mongod
Then you need to verify if you connect successfully or if a connection error occurs by adding the following code.
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function() {
console.log('We are connected to db!');
});
Your complete server code should look like this.
var express = require("express");
var app = express();
var bodyParser = require("body-parser");
var mongoose = require("mongoose");
// Use native promises
mongoose.Promise = global.Promise;
mongoose.connect("mongodb://localhost/BlogApp");
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function() {
// we're connected!
console.log('We are connected to db!');
});
app.set("views engine", "ejs");
app.use(express.static("public"));
app.use(bodyParser.urlencoded({extended: true}));
app.get('/', function (req, res) {
res.send('Hello World!')
});
app.listen(3000, function () {
console.log('Example app listening on port 3000!')
});

I figured it out guys.
I ended up deleting the whole mongodb file and reinstall the whole thing, and now im good.

socket.io not working with node server

I'm trying to set up my node server to update all the connected clients with new information in real-time. When I run the code below, the io.sockets.on('connection') callback is fired constantly, flooding the console with the message Client connected!, and the front-end is not being updated from socket.emit(). What am I doing wrong?
app.js
var express = require('express');
var path = require('path');
var favicon = require('static-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var mongoose = require('mongoose');
var models = require('./models.js');
var routes = require('./routes/index');
var users = require('./routes/users');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
app.use(favicon());
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded());
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', routes);
app.use('/users', users);
/// catch 404 and forwarding to error handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
/// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: err
});
});
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
res.status(err.status || 500);
res.render('error', {
message: err.message,
error: {}
});
});
module.exports = app;
// Connect to the Mongo database
mongoose.connect('mongodb://localhost/test');
bin/www.js
#!/usr/bin/nodejs
var debug = require('debug')('my-application');
var app = require('../app');
app.set('port', process.env.PORT || 3000);
var io = require('socket.io').listen(app.listen(app.get('port')));
io.sockets.on('connection', function(socket) {
console.log('Client connected!');
socket.on('message', function(data) {
console.log('Sending update!');
socket.emit('update', 'Working!');
});
});
public/javascripts/update.js
var socket = io.connect('http://' + document.location.hostname + ':3000/');
socket.on('connect', function() {
console.log('Socket connected!');
socket.emit('message', 'Message from client');
});
socket.on('update', function(data) {
alert(data);
});
And when I end the npm process, the client begins to log
http://<ip>:3000/socket.io/?EIO=2&transport=polling&t=1498772846992-691 net::ERR_CONNECTION_REFUSED
I've read posts about the express router messing with the socket requests but I can't seem to get it working no matter what I try.

Can you try this setup?
EDITED:
app.js:
var express = require('express');
var app = express();
app.set('views', __dirname + '/views');
app.set('view engine', 'pug');
app.get('/', function (req, res) {
res.render('index');
});
module.exports = app;
bin/www.js:
var app = require('../app');
var http = require('http');
var server = http.createServer(app);
server.listen(process.env.PORT || '3000', function () {
console.log('server listens on port 3000');
});
var io = require('socket.io')(http);
io.listen(server);
io.on('connection', function(socket) {
console.log('Client connected!');
socket.on('message', function (data) {
console.log('Sending update!');
socket.emit('update', 'Working!');
});
});
index.pug (or jade, they say jade is obsolete):
doctype html
html
body
h1 Testing socket.io
h3#status not connected
br
p#update update:&nbsp
script(src="/socket.io/socket.io.js")
script.
var socket = io();
socket.on('connect', function() {
document.getElementById("status").innerHTML = "connected";
socket.emit('message', 'Hello!');
});
socket.on('update', function (data) {
document.getElementById("update").innerHTML += data;
});

Calling app.listen (where app is the result of invoking express()) returns an HTTPServer, which can be used to setup the socket connection:
var server = app.listen(port);
var io = socket(server);
without manually running your solution, I'd guess that because you're creating a new HTTPServer to be feed into the socket, it's somehow getting hung in a loop.

node.js not printing to console

I am trying to use sockets in my api. However I could not see the logs in the console.
The only output I see is:
[nodemon] restarting due to changes...
[nodemon] starting `node server.js`
We are live on8000
Here is my server.js file:
// server.js
const express = require('express');
const MongoClient = require('mongodb').MongoClient;
const bodyParser = require('body-parser');
const app = express();
const port = 8000;
var server = require('http').createServer(app);
var io = require('socket.io')(server);
const db = require('./config/db');
app.use(express.static(__dirname + '/../app'));
app.use(bodyParser.urlencoded({ extended: true }));
MongoClient.connect(db.url,(err,database) =>{
if (err) return console.log(err);
//check below line changed
require('./app/routes')(app, database);
app.listen(port,() => {
console.log("We are live on"+port);
});
app.get('/', function(req, res){
res.sendFile(__dirname + '/index.html');
});
io.on('connection',function(socket){
console.log('client connected');
socket.on('disconnect', function () {
console.log('disconnect');
});
});
})
and the index.html is:
<!DOCTYPE html>
<html>
<head><title>Hello world</title></head>
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io();
</script>
<body>Hello world</body>
</html>
I see Hello world on the web browser, but I could not see 'client connected' on the console log.

Update: In your browser client you can see error in console.log http://localhost:8000/socket.io/socket.io.js 404 and (index):6 Uncaught ReferenceError: io is not defined
You have attach socket handler to a http server var io = require('socket.io')(server);, but in your code you start web server by express server
app.listen(port,() => {
console.log("We are live on"+port);
});
change it to
server.listen(port,() => {
console.log("We are live on"+port);
});

I have created a new .js file and listening to port 3000 instead of 8000 worked for socket.io
appsocket.js
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
app.get('/', function(req, res){
res.sendfile('index.html');
});
//Whenever someone connects this gets executed
io.on('connection', function(socket){
console.log('A user connected');
//Whenever someone disconnects this piece of code executed
socket.on('disconnect', function () {
console.log('A user disconnected');
});
});
http.listen(3000, function(){
console.log('listening on *:3000');
});
Now I am able to see the logs on console when I call localhost:3000 instead of localhost:8000

Express routing error Cannot Get /api/name

Having some trouble setting up the restful API for my express app.
Here is my app.js:
var express = require('express'),
app = express(),
bodyParser = require('body-parser'),
methodOverride = require('method-override');
routes = require('./routes'),
api = require('./routes/api'),
port = process.env.PORT || 3000;
app.use(express.static(__dirname + '/public'));
app.use(bodyParser.json());
app.use(methodOverride());
app.use(bodyParser.urlencoded({extended: true}));
// Page Routes
app.get('/', routes.index);
app.get('/partials/:filename', routes.partials);
// // API Routes
app.get('/api/name', api.name);
app.listen(port, function() {
console.log('Listening on port ' + port);
});
In /routes/api.js I have the following test function:
exports.name = function (req, res) {
res.json({
name: 'Test'
});
};
Currently I get the following error when i go to http://my_ip/api/name
Cannot GET /api/name
Any ideas?
Thanks

The following code is working for me. I think there is some issue with your routes package. Can you share the code of 'routes' package and file structure ?
app.js
var express = require('express'),
app = express(),
routes = require('./routes');
api = require('./routes/api'),
port = process.env.PORT || 3000;
// Page Routes
app.get('/', routes.index);
// API Routes
app.get('/api/name', api.name);
app.listen(port, function() {
console.log('Listening on port ' + port);
});
/routes/api.js
exports.name = function (req, res) {
res.json({
name: 'Test'
});
};
/routes.js
exports.index = function (req, res) {
res.json({
name: 'Index'
});
};

How to get my node.js mocha test running?

I have developed a service in node.js and looking to create my first ever mocha test for this in a seperate file test.js, so I can run the test like this:
mocha test
I could not figure out how to get the reference to my app, routes.js:
var _ = require('underscore');
module.exports = function (app) {
app.post('/*', function (req, res) {
var schema={
type: Object,
"schema":
{
"totalRecords": {type:Number}
}
};
var isvalid = require('isvalid');
var validJson=true;
isvalid(req.body,schema
, function(err, validObj) {
if (!validObj) {
validJson = false;
}
handleRequest(validJson,res,err,req);
});
})
}
This is the server.js:
// set up ======================================================================
var express = require('express');
var app = express(); // create our app w/ express
var port = process.env.PORT || 8080; // set the port
var bodyParser = require('body-parser');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));
app.use (function (error, req, res, next){
res.setHeader('content-type', 'application/json');
res.status(400);
res.json({
"error": "errormsg"
});
});
// routes ======================================================================
require('./routes.js')(app);
// listen (start app with node server.js) ======================================
app.listen(port);
console.log("App listening on port " + port);
And finally test.js:
"use strict";
var request = require('supertest');
var assert = require('assert');
var express = require('express');
var app = express();
describe('testing filter', function() {
it('should return an error', function (done) {
request(app)
.post('/')
.send({"hh":"ss"})
.expect(400,{"error": "errormsg"})
.end(function (err, res) {
if (err) {
done(err);
} else {
done();
}
});
});
});

Create a separate file called app.js. The only purpose of this file would be to run the server. You'll also need to export your app object from server.js. So, your server.js would look like this
// set up ======================================================================
var express = require('express');
var app = express(); // create our app w/ express
var port = process.env.PORT || 8080; // set the port
var bodyParser = require('body-parser');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));
app.use (function (error, req, res, next){
res.setHeader('content-type', 'application/json');
res.status(400);
res.json({
"error": "errormsg"
});
});
// routes ======================================================================
require('./routes.js')(app);
module.exports = app;
Create a new file called app.js and put this inside of it
var app = require('./app');
var port = process.env.port || 8000;
app.listen(port, function() {
console.log("App listening on port " + port);
});
Now, inside of your test file, import your app as follows
var request = require('supertest');
var assert = require('assert');
var app = require('./app.js');
....
Note that I assume all your files are in the same directory. If you've put your test file in a different folder then you'll need to give the right path while requiring your app object.