simple express routing PoC for error handling

app.js

// Includes
var express = require('express'),
  errors = require('./errors'),
  NotFound = errors.NotFound,
  app = module.exports = express.createServer();

// Configuration
app.configure(function(){
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(app.router);
});

// Error Handling
app.use(function(req, res, next) {
  next(new NotFound(req.url));
});
app.error(function(err, req, res, next) {
  if (err instanceof NotFound) {
    console.log('[404]: ', err.name);
    return res.send('[404]: ' + err.name, { 'Content-Type': 'text/plain' }, 404);
  } else {
    console.log('[500]: ', err.stack);
    return res.send('[500]: ' + err.stack, { 'Content-Type': 'text/plain' }, 500);
  }
});

// Routes
require('./routes')(app);

// Startup
app.listen(3000);
console.log("Express server listening on port %d in %s mode", app.address().port, app.settings.env);

errors.js

var util = require('util');

function NotFound(path) {
  this.name = 'Not Found' + (path ? ':  ' + path : '');
  if (path) {
    Error.call(this, 'Cannot find ' + path);
    this.path = path;
  } else {
    Error.call(this, 'Not Found');
  }

  Error.captureStackTrace(this, arguments.callee);
}

util.inherits(NotFound, Error);

var exports = module.exports = {
  NotFound: NotFound
};

routes.js

module.exports = function(app) {
  app.get('/bad', function(req, res) {
    aBadMethodCall();
  });
};