express/examples/error/app.js

/**
 * Module dependencies.
 */

var express = require('../../lib/express');

var app = express.createServer();

app.get('/', function(req, res){
  // Caught and passed down to the errorHandler middleware
  throw new Error('something broke!');
});

app.get('/next', function(req, res, next){
  // We can also pass exceptions to next()
  next(new Error('oh no!'))
});

// The errorHandler middleware in this case will dump exceptions to stderr
// as well as show the stack trace in responses, currently handles text/plain,
// text/html, and application/json responses to aid in development
app.use('/', express.errorHandler({ dump: true, stack: true }));

app.listen(3000);
console.log('app listening on port 3000');