Not able to solve Express Middleware issue - node.js

Question

My first piece of code below:
var express = require('express');
var app = express.createServer(express.logger());
app.get('/', function(request, response){
response.send('Hello World 2');
});
var port = process.env.PORT || 5000;
app.listen(port, function(){
console.log("Listening on " + port);
});
Threw up the error: "Most middleware (like logger) is no longer bundled with Express and must be installed separately"
So I looked at StackOverflow, did npm install morgan, and changed my code to:
var express = require('express');
var logger = require('morgan');
var app = express.createServer(logger());
app.get('/', function(request, response){
response.send('Hello World 2');
});
var port = process.env.PORT || 5000;
app.listen(port, function(){
console.log("Listening on " + port);
});
Now I get this error:
var app = express.createServer(logger());
^
TypeError: Object function createApplication() {
var app = function(req, res, next) {
app.handle(req, res, next);
};
mixin(app, proto);
mixin(app, EventEmitter.prototype);
app.request = { __proto__: req, app: app };
app.response = { __proto__: res, app: app };
app.init();
return app;
} has no method 'createServer'

Answer 1

That is because createServer method has been removed from express.
use
app = express();
app.use(logger())
instead of
app = express.createServer(logger())
Many things got changed from express 3.0 to 4.0. You should have a look here

Answer 2

You should create app with express(). Afterwards, you can setup any middleware (like morgan in this case) with app.use:
var express = require('express');
var logger = require('morgan');
var app = express();
app.use(logger());
...
app.use() documentation: http://expressjs.com/4x/api.html#app.use. (Linking to Express 4.x documentation as not explicit what Express version you're running).
There is an exact same example like the one I wrote above in Morgan's README in GitHub.