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JS, Express: Failed to lookup view in directory regardless following guide

Im following this guide:
https://appdividend.com/2017/06/18/node-js-express-tutorial/
And did a lot of research but somehow can't get it working.
My folder structure:
My code:
// app.js
var express = require('express');
var app = express();
var port = 3000;
app.use(express.static('public'));
app.listen(port, function(){
console.log('Server is running on port:', port);
})
app.get('/', function(req, res){
res.send('Hello Express');
});
app.set('view engine', 'ejs');
var itemRouter = express.Router();
app.use('/items', itemRouter);
itemRouter.route('/').get(function (req, res) {
res.render('items');
});
itemRouter.route('/single').get(function (req, res) {
res.render('singleItem');
});
My output:
Error: Failed to lookup view "items" in views directory "C:\Users\Karol\views"
at Function.render (C:\Users\Karol\node_modules\express\lib\application.js:580:17)
at ServerResponse.render (C:\Users\Karol\node_modules\express\lib\response.js:1008:7)
at C:\Users\Karol\Desktop\CB\app.js:27:7
at Layer.handle [as handle_request] (C:\Users\Karol\node_modules\express\lib\router\layer.js:95:5)
at next (C:\Users\Karol\node_modules\express\lib\router\route.js:137:13)
at Route.dispatch (C:\Users\Karol\node_modules\express\lib\router\route.js:112:3)
at Layer.handle [as handle_request] (C:\Users\Karol\node_modules\express\lib\router\layer.js:95:5)
at C:\Users\Karol\node_modules\express\lib\router\index.js:281:22
at Function.process_params (C:\Users\Karol\node_modules\express\lib\router\index.js:335:12)
at next (C:\Users\Karol\node_modules\express\lib\router\index.js:275:10)
This is what I get when I visit localhost:port/items (replace port with actual port number).

There is a problem about resolving views path. Try to require path module after express
var express = require('express');
var path = require('path');
var app = express();
var port = 3000;
and after setting ejs template add this:
app.set('view engine', 'ejs');
app.set('views', path.resolve(__dirname, 'views'));

Replace :
app.use('/items', itemRouter);
itemRouter.route('/').get(function (req, res) {
res.render('items');
});
itemRouter.route('/single').get(function (req, res) {
res.render('singleItem');
});
by :
itemRouter.route('/items/').get(function (req, res) {
res.render('items');
});
itemRouter.route('/items/single').get(function (req, res) {
res.render('singleItem');
});

var path = require('path');
Try this to set the directory for the public like this.
app.set('view_engine', 'ejs');
app.set('views', path.join(__dirname,'/views'))
It will get the project directory and set the views path.

Error: Can't set headers after they are sent. - Nodejs ExpressJs

I got the code below from some other resources, trying to work with Twitter api, but it throws me some error.
I couldn't understand how to resolve that. Sometimes the error will appear when I use callbacks twice, but nothing seems like that.
var express = require('express'),
app = express(),
server = require('http').createServer(app),
routes = require('./routes'),
io = require('socket.io').listen(server),
path = require('path'),
twitter = require('ntwitter');
app.configure(function()
{
app.set('port', process.env.PORT || 5000);
app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');
app.use(express.favicon());
app.use(express.logger('dev'));
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public'))); });
app.configure('development', function(){
app.use(express.errorHandler());
});
server.listen(app.get('port'), function(){
console.log("Express server listening on port " + app.get('port'));
});
app.get('/', routes.index); var twit = new twitter({
twit.stream('statuses/filter', { locations: criteria }, function(stream) {
stream.on('data', function (data) {
var geo=false,latitude,longitude;
io.sockets.volatile.emit('tweets', {
});
});
});
index.js
exports.index = function(req, res){
res.render('index', { title: '', criteria:'' });
};
Errors I am getting:
Express server listening on port 5000
GET / 200 30ms - 8.43kb
_http_outgoing.js:335
throw new Error('Can\'t set headers after they are sent.');
^
Error: Can't set headers after they are sent.
at ServerResponse.OutgoingMessage.setHeader (_http_outgoing.js:335:11)
at ServerResponse.res.setHeader (/home/jayasurya/Desktop/node-twitter-modules/TweetMapViewer/node_modules/connect/lib/patch.js:59:22)
at next (/home/jayasurya/Desktop/node-twitter-modules/TweetMapViewer/node_modules/connect/lib/proto.js:153:13)
at Function.app.handle (/home/jayasurya/Desktop/node-twitter-modules/TweetMapViewer/node_modules/connect/lib/proto.js:198:3)
at Server.app (/home/jayasurya/Desktop/node-twitter-modules/TweetMapViewer/node_modules/connect/lib/connect.js:66:31)
at Manager.handleRequest (/home/jayasurya/Desktop/node-twitter-modules/TweetMapViewer/node_modules/socket.io/lib/manager.js:564:28)
at Server.<anonymous> (/home/jayasurya/Desktop/node-twitter-modules/TweetMapViewer/node_modules/socket.io/lib/manager.js:118:10)
at emitTwo (events.js:92:20)
at Server.emit (events.js:172:7)
at HTTPParser.parserOnIncoming [as onIncoming] (_http_server.js:528:12)
Many thanks for any help!

TypeError: data base object cannot be found

I am using "express": "3.2.6", and nodeJS v0.10.25.
When running my app.js I get:
TypeError: Object #<IncomingMessage> has no method 'getConnection'
My app.js:
/**
* Module dependencies.
*/
var express = require('express')
, routes = require('./routes')
, user = require('./routes/user')
, http = require('http')
, path = require('path');
var app = express();
//database connection
var connection = require('express-myconnection');
var mysql = require('mysql');
//all environments
app.set('port', process.env.PORT || 3000);
app.set('views', __dirname + '/views');
app.set('view engine', 'jade');
app.use(express.favicon());
app.use(express.logger('dev'));
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public')));
//development only
if ('development' == app.get('env')) {
app.use(express.errorHandler());
}
/*------------------------------------------
connection peer, register as middleware
type koneksi : single,pool and request
-------------------------------------------*/
app.use(
connection(mysql,{
host: 'localhost',
user: 'root',
password : '',
port : 3306, //port mysql
database:'db-test'
},'pool')
);
//routes
//app.get('/', routes.index);
app.get('/', routes.list);
app.get('/users', user.list);
http.createServer(app).listen(app.get('port'), function(){
console.log('Express server listening on port ' + app.get('port'));
});
My index.js file looks like that:
/*
* GET home page.
*/
//exports.index = function(req, res){
// res.render('index', { title: 'Express' });
//};
/**
* returns all trade objects
*/
exports.list = function(req, res){
req.getConnection(function(err,connection){
connection.query('SELECT * FROM trades',function(err,rows) {
if(err)
console.log("Error Selecting : %s ",err );
res.render('customers',{page_title:"Customers - Node.js",data:rows});
});
});
};
I am getting the following exception:
Express server listening on port 3000
TypeError: Object #<IncomingMessage> has no method 'getConnection'
at exports.list (C:\Users\nodeWorkspace\Test\routes\index.js:14:6)
at callbacks (C:\Users\nodeWorkspace\Test\node_modules\express\lib\router\index.js:161:37)
at param (C:\Users\nodeWorkspace\Test\node_modules\express\lib\router\index.js:135:11)
at pass (C:\Users\nodeWorkspace\Test\node_modules\express\lib\router\index.js:142:5)
at Router._dispatch (C:\Users\nodeWorkspace\Test\node_modules\express\lib\router\index.js:170:5)
at Object.router (C:\Users\nodeWorkspace\Test\node_modules\express\lib\router\index.js:33:10)
at next (C:\Users\nodeWorkspace\Test\node_modules\express\node_modules\connect\lib\proto.js:190:15)
at Object.methodOverride [as handle] (C:\Users\nodeWorkspace\Test\node_modules\express\node_modules\connect\lib\middleware\methodOverride.js:37:5)
at next (C:\Users\nodeWorkspace\Test\node_modules\express\node_modules\connect\lib\proto.js:190:15)
at multipart (C:\Users\nodeWorkspace\Test\node_modules\express\node_modules\connect\lib\middleware\multipart.js:64:37)
[90mGET / [31m500 [90m59ms
Any recommendation what I am doing wrong?
I appreciate your answer!

Looks like you used example somethink like this: http://teknosains.com/i/simple-crud-nodejs-mysql but changed code sequence.
Move app.use(app.router); under declared app.get/app.post.
Also you can use other case of mysql integration as: https://www.npmjs.com/package/express-myconnection

node.js TypeError: Object has no method get

I'm trying to separate server initiation and other calls from the core file(app.js) but when I try to run it, it issues me error that
http.createServer(app).listen(app.get('port'), function(){
^
TypeError: Object function (){ all code from app.js file }
has no method 'get'
This is app.js file.
/**
* Module dependencies.
*/
module.exports = function(){
var express = require('express');
var routes = require('./routes');
var path = require('path');
var app = express();
// all environments
app.set('port', process.env.PORT || 4000);
app.set('views', __dirname + '/views');
app.set('view engine', 'jade');
app.use(express.favicon());
app.use(express.logger('dev'));
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public')));
// development only
if ('development' == app.get('env')) {
app.use(express.errorHandler());
}
app.get('/', routes.index);
return app;
};
and this is server.js file.
var http = require('http'),
app = require('./app');
http.createServer(app).listen(app.get('port'), function(){
console.log('Express server listening on port ' + app.get('port'));
});
using express#3.4.0
what am I missing OR doing wrong.. please help.

You have no reason to return a function into your app.js file, just return the express object:
var express = require('express');
var app = express();
// ... more variables
// ... the rest of your code
module.exports = app;
Then, the rest of your code into server.js will work fine.
Remember that module.exports works like a "return" into CommonJS (and therefore NodeJS).
See documentation.

You're passing a function to module.exports, so when you require('./app'), you need to call it like a function:
var http = require('http'),
app = require('./app')();
http.createServer(app).listen(app.get('port'), function(){
console.log('Express server listening on port ' + app.get('port'));
});

Using Socket.io with Node.js, Express and Jade

I have some trouble to use Socket.io even just to test if a client is connected. I've tried many things and I think that my mistake is, maybe, when I do the app.get function. I have also tried to do this in an route js file but it wasn't conclusive neither. So here are my different codes :
App.js
/**
* Module dependencies.
*/
var express = require('express');
var routes = require('./routes');
var user = require('./routes/user');
var http = require('http');
var path = require('path');
var mongo = require('mongodb');
var monk = require('monk');
var db = monk('mongodb://xxxxx:xxxxx#ds051067.mongolab.com:51067/jdo');
var app = express(),
server = http.createServer(app) ,
io = require('socket.io').listen(server);
// all environments
app.set('port', process.env.PORT || 3000);
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
app.use(express.favicon());
app.use(express.logger('dev'));
app.use(express.json());
app.use(express.urlencoded());
app.use(express.methodOverride());
app.use(express.cookieParser('This is secret'));
app.use(express.session());
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public')));
// development only
if ('development' == app.get('env')) {
app.use(express.errorHandler());
}
io.sockets.on('connection', function (socket) {
console.log('Un client est connecté !');
});
// app.get('/', routes.index);
app.get('/users', user.list);
app.get('/deplacement',routes.deplacement);
app.get('/monCompte', routes.compte);
app.get('/connexion', routes.connexion);
app.get('/', function(req, res) {
res.render('index.jade');
});
server.listen(app.get('port'), function(){
console.log('Express server listening on port ' + app.get('port'));
});
Index.jade
extends layout
block content
script(src="/socket.io/socket.io.js").
var socket = io.connect('http://localhost:3000');
});
PS : Sorry if my english is bad ^^

You can't use inline javascript in the same script tag as an included script.
extends layout
block content
script(src="/socket.io/socket.io.js")
script.
var socket = io.connect('http://localhost:3000');