Nodejs CANNOT GET - node.js

Question

I've been trying to do a route in Express. For example one /about route, but it doesn't work.
var express = require('express');
var app = express();
var router = express.Router();
var moment = require('moment');
var bodyParser = require('body-parser');
var multer = require('multer'); // v1.0.5
var upload = multer(); // for parsing multipart/form-data
app.use(bodyParser.json()); // for parsing application/json
app.use(bodyParser.urlencoded({ extended: true })); // for parsing application/x-www-form-urlencoded
app.get('/', function (req, res) {
//some action
});
app.get('/time', function (req, res) {
//...
});
app.get('/about', function (req, res) {
res.send('about');
});
Currently after calling url/about I'm getting Cannot GET /about as a return and after some research I've got no idea how to resolve this issue. They even describe it that way in the official express docs.
Thank you in advance.

Answer 1

You have something like this in your code? :
app.listen(SERVER_PORT, function () {
console.log("Server successfully started on port:" + SERVER_PORT); });

Answer 2

We should have something like this:
var express = require('express');
var routes = require('./routes');
var http = require('http');
var path = require('path');
const app = express();
// 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(app.router);
app.use(require('stylus').middleware(path.join(__dirname, 'public')));
app.use(express.static(path.join(__dirname, 'public')));
// development only
if ('development' == app.get('env')) {
app.use(express.errorHandler());
}
app.get('/', routes.index);
app.get('/about', routes.about);
and also in the views folder: about.jade