Middleware for Express.js

app.js

var express = require('express');
var app = express();
var server = app.listen(3000);


function logger(req,res,next){
  console.log(new Date(), req.method, req.url);
  next();
}

function hello(req,res,next){
  res.write('Hello \n');
  next();
}

function bye(req,res,next){
  res.write('Bye \n');
  res.end();
}

app.use(logger);
app.get('/hello',hello,bye);

//-----
$ curl http://localhost:3000/hello
Hello
Bye
$
And the server will log our requests as well:
Mon Mar 23 2015 11:23:59 GMT-0700 (PDT) 'GET' '/hello'

//////////

var app = express();
var apiRouter = express.Router();
apiRouter.use(logger);
app.use('/api',apiRouter);
app.use(hello,bye);

//-----
our server logs the API request:
Mon Mar 23 2015 14:48:59 GMT-0700 (PDT) 'GET' '/hello'

//https://stormpath.com/blog/how-to-write-middleware-for-express-apps
//https://github.com/node-inspector/node-inspector


//////////


app.get('/profile', isLoggedIn, function(req, res) {
        res.render('profile.ejs', {
            user : req.user // get the user out of session and pass to template
        });
    });
    
function isLoggedIn(req, res, next) {
    // if user is authenticated in the session, carry on 
    if (req.isAuthenticated())
        return next();
    // if they aren't redirect them to the home page
    res.redirect('/');
}

//////////

app.use(getHost,session({
	secret: 'nnn',
	resave: false,
	saveUninitialized: false,
	name: 'nnn',
	cookie: {
		httpOnly: true,
		domain: host,
		path: '/'
	}
}));

function getHost(req, res, next) {
	host = req.get('host');
	next();
}