How to include all routes in a folder for express using node-walker

index.js

// include the express framework
var express = require('express');

// include the node-walker module 
// -> npm install node-walker
var walker = require('node-walker');

// the express server instance
var app = express.createServer();

// a variable to count
var i = 0;

// route path from where we will load the routes
var routepath = __dirname + '/routes';
console.log('Including routes in ' + routepath + '\n');

// start walking the folder
walker(routepath, function (err, filename, next) {
	
	// an error occurred somewhere along the lines
	if (err) throw err;
	
	// filename
	if (filename !== null) {
		
		var route;
		
		// increment the counter
		i++;
		
		// "require" the file
		route = require(filename);
		
		// call the "register" method for the route
		// provide app as an argument, could also
		// provide a database connection, settings 
		// or the like
		route.register(app);
	}
	
	// there are more files to come
	if (next) {
		
		// continue with next file
		next();
		
	} else {
		// no more files to come, we're done
		console.log('\nDone. ' + i + ' route files have been included.');
		
		// now we start listening
		app.listen(80);
	}
	
});

test.route.js

// assume all routes are stored in a subfolder called "routes"
// this test.route.js exports a function called "register"
// which is then called in the main file and takes the express
// app as an argument

var exports = module.exports;

exports.register = function (app) {
	
	// register the route
	app.get('/test', function (req, res) {
		res.end('Hello world.');
	});
	
	// log that route has been registered
	console.log('GET /test');
}