Express: Basic 'all', 'get', 'post', 'next' example with multiple callbacks (log); configuration examples

gistfile1.js

var express = require('express'),
 bodyParser = require('body-parser'),
        app = express();

// configurations
app.set('env', 'development'); // default: process.env.NODE_ENV
app.enable('trust proxy'); // for reverse proxy; disabled by default
app.set('jsonp callback name', 'cb'); // json with padding
app.set('json replacer', function (attr, val) {
    if (attr === 'passwordHash') {
        return undefined;
    }
    return val;
});
app.enable('case sensitive routing'); // disabled by default: /hello /Hello
app.enable('strict routing'); // enabled by default: /hello /hello/
app.enable('view cache');   // recommended in production environment

// view configurations
app.set('view engine', 'jade') // or 'ejs'; eliminates need for extensions in `render`


function log (req, res, next) {
    console.log(names);
    next();
}

app.use(bodyParser.urlencoded());

var names = [];

app.all('/', function (req, res, next) {
    console.log('from ALL');
    next();
});

app.get('/', log, function (req, res) {
    res.render('index.jade', { names: names });
});

app.post('/', function (req, res) {
    names.push(req.body.name);
    res.redirect('/');
});

app.listen(3000);