Handle error globally in express.js app

handle-error.js

var express = require('express');
var http = require('http');
var app = express();

app.use(
  function handleError(req, res, next) {
    var domain = require('domain').create();

    res.on('close', function() {
      domain.dispose();
    });

    domain.on('error', function(error) {
      // Caught error.
      // Deal with error here.

      domain.dispose();
      next(error);
    });
    domain.run(next);
  }
);

app.get('/', function(req, res) {
  a+b; // Throw an error!
  res.setHeader("Content-Type", "text/plain");
  res.end("WOHOO! Everything is fine!");
});

app.all('*', function(error, req, res, next) {
  res.writeHeader(500, {'Content-Type' : "text/html"});
  res.write("<h1>" + error.name + "</h1>");
  res.end("<p style='border:1px dotted red'>" + error.message + "</p>");
});

http.createServer(app).listen(5678, function() {
  console.log("Server is running on port 5678");
});