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Running Express route

I have the following snippet of code and when I access the local host I get an error: Cannot GET /
var express = require('express');
var router = express.Router();
/* GET home page. */
router.get('/', function(req, res, next) {
res.send("function has started");
});
express().listen(3001);
module.exports = router;

var express = require('express')
var app = express()
app.get('/', function (req, res) {
res.send('GET request to the homepage')
})
app.listen(3001)
This should be fine

If you want to use the router, you need to use the use method example (app.use('/', router):
var express = require('express');
var router = express.Router();
var app = express()
/* GET home page. */
router.get('/', function (req, res, next) {
res.send("function has started");
});
app.use('/', router)
app.listen(3001);

Express: Serving static files for defined routes

When I visit mysite.com/verify/myusn the result is a 404 error. When I visit mysite.com/ it serves me the index page as expected.
When I turned on the debugger, I realized Express was trying to serve a static file instead. But it also shows my route being registered properly. Please help me out.
Here is my debugger:
Here is my server.js:
var express = require('express');
var app = express();
var path = require('path');
app.get('/*', function(req, res, next){
next();
});
app.use(express.static(path.join(__dirname , '/_site/') , {maxAge:0}));
app.use('/assets/', express.static(path.join(__dirname , '/_site/assets') , {maxAge:0}));
var routesLogin = require(path.join(__dirname, '/api/routes/users'));
routesLogin(app);
app.get('/', function(req, res) {
res.sendFile( path.join(__dirname , '/_site/landing.html'));
});
app.get('*', function(req, res) {
res.send('404');
});
app.post('*', function(req, res) {
res.send('404');
});
port = process.env.PORT || 3000;
app.listen(port);
console.log('listening on ' + port);
./api/routes/users.js:
module.exports = function(app){
var users = require('../controllers/userController');
app.route('verify/:usn')
.get(users.verifyUSN)
};
./api/controllers/userController.js:
exports.verifyUSN = function(req, res, next){
res.status(200)
.json({
status: 'success',
data: data,
message: 'USN Verified.'
});
}

I believe your problem could potentially be in /api/routes/users.js
module.exports = function(app){
var users = require('../controllers/userController');
// previously app.route('verify/:usn')
app.route('/verify/:usn')
.get(users.verifyUSN)
};
Hope this helps.

Unexpexted 404 in express.js

I really don't understand why node(express) just render index page and return 404 for other pages ("comproAffitto" in the example).
app.js
var index = require('./routes/index');
var comproAffitto= require ('./routes/comproAffitto');
...
...
app.use('/', index);
app.use('/comproAffitto', comproAffitto);
routes/index.js
var express = require('express');
var router = express.Router();
/* GET home page. */
router.get('/', function(req, res, next) {
res.render('index', { title: 'Express' });
});
module.exports = router;
routes/comproAffitto.js
var express = require('express');
var router = express.Router();
/* GET comproAffitto page. */
router.get('/comproAffitto', function(req, res, next) {
console.log("dentro");
res.render('comproAffitto', { title: 'Exprrress' });
});
module.exports = router;
html href
<a href="/comproAffitto/" class ....
console log
GET /comproAffitto/ 404
where is the problem?
thank you all

You are constructing the path two times: /comproAffitto/comproAffitto.
You should remove one of them or here:
app.use('/', comproAffitto);
or there:
routes/comproAffitto.js
var express = require('express');
var router = express.Router();
/* GET comproAffitto page. */
router.get('/', function(req, res, next) {
console.log("dentro");
res.render('comproAffitto', { title: 'Exprrress' });
});
module.exports = router;
leaving app.use('/comproAffitto', comproAffitto);

You defined /comproAffitto/comproAffitto instead of /comproAffitto
You would need to either change this:
app.use('/comproAffitto', comproAffitto);
to this:
app.use('/', comproAffitto);
or this:
router.get('/comproAffitto', function(req, res, next) {
to this:
router.get('/', function(req, res, next) {

express (4.0) custom middleware runs on both instances of router even though it's only declared for one

I'm using the code below to learn a bit about the new express.js (4.0). I can't seem to understand why the logging is happening regardless of which path I hit with my browser. Shouldn't it only log for website.get and not for api.get paths?
// Express 4.0 test...
var express = require('express');
var app = express();
var website = express.Router();
var api = express.Router();
var port = process.env.PORT || 3000;
website.use(function (req, res, next) {
console.log(req.method, req.url);
next();
});
website.get('/', function (req, res) {
res.send('Home page');
});
website.get('/about', function (req, res) {
res.send('About page');
});
api.get('/', function (req, res) {
res.send({'json':'response'});
});
api.get('/user', function (req, res) {
res.send({'user':'john'});
});
// app.get('/', function (request, response) {
// response.writeHead(200, {"Content-Type": "text/html"});
// response.end("<h1>Hello, World!</h1>");
// });
app.use('/', website);
app.use('/api', api);
app.listen(port);
console.log('http(s) server revved up on port ' + port);
Any help would rock!
Update: I see, because '/api' matches '/', website gets applied to all routes. Is there any way to avoid this?

probably define the /api router first and the other one - second.
app.use('/api', api);
app.use('/', website);

Using different router for different subdomains in node.js with express

I want to use different routes in my app, depending on the subdomain in req.headers.host.
So I came around with this idea (extremely simplified example):
var express = require('express');
var domain1 = require('./routes/domain1');
var domain2 = require('./routes/domain2');
var app = express();
app.use('*', domainRouting);
function domainRouting(req, res, next){
var subdomain = req.headers.host.split('.')[0];
if(subdomain === 'domain1'){
app.use(domain1);
}
else{
app.use(domain2);
}
next();
}
//404 handler
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
res.send('error');
});
var server = app.listen(3001, function() {
console.log('Listening on port %d', server.address().port);
});
domain1.js:
var express = require('express');
var router = express.Router();
router.get('/', function(req, res) {
res.send('DOMAIN 1: ' + req.url);
});
module.exports = router;
domain2.js:
var express = require('express');
var router = express.Router();
router.get('/', function(req, res) {
res.send('DOMAIN 2: ' + req.url);
});
module.exports = router;
But this does not work, the routes are ignored and the request jumps into the last 404-handler.
Any ideas for this?

You can't use app.use() dynamically like that within a middleware. You might call your router directly with domain1(req, res, next) instead of app.use(domain1).
Or you might look into using a module like subdomain to make it easier to handle subdomains in Express.