app.js

var express = require('express'),
    path = require('path'),
    favicon = require('serve-favicon'),
    logger = require('morgan'),
    bodyParser = require('body-parser'),
    methodOverride = require('method-override');

var routes = require('./routes/index');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(favicon(__dirname + '/public/images/favicon.png'));
app.use(express.static(path.join(__dirname, 'public')));
app.use(logger('dev'));
app.use(bodyParser.urlencoded({
    extended: true
}));
app.use(bodyParser.json({
    extended: true
}));

app.use(methodOverride());
app.use(logErrors);
app.use(clientErrorHandler);
app.use(errorHandler);

/// error handlers

function errorHandler(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
        message: err.message,
        title: err.status
    });
}

function clientErrorHandler(err, req, res, next) {
    if (req.xhr) {
        res.status(500).send({error: 'Something blew up!'});
    } else {
        next(err);
    }
}

function logErrors(err, req, res, next) {
    console.error(err.stack);
    next(err);
}

app.use('/', routes);

module.exports = app;