express.js + pjax workflow

app.js

var express      = require( 'express' ),
    bodyParser   = require( 'body-parser' ),
    pjax         = require( './pjax-helper' );
    
var app = express();

app.set( 'views', __dirname + '/views' );
app.set( 'view engine', 'jade' );

app.use( pjax() );

app.use( bodyParser.urlencoded({ extended: true }) );
app.use( bodyParser.json() );

app.use( express.static( __dirname + '/public' ) );

app.route( '/' ).get( function( req, res ) {
    res.render( 'index' );
});

app.route( '/another' ).get( function( req, res ) {
    res.render( 'another', { title: 'another page' } );
});

app.listen( 3000 );

pjax-helper.js

'use strict';

module.exports = function() {
    return function pjax( req, res, next ) {
        if( req.header( 'X-PJAX' ) ) {
            req.pjax = true;
            res.locals.pjax = true;
        }
        next();
    };
};

views-another.jade

extends layout

block contents
    p another page!

views-index.jade

extends layout

block contents
    p index page!

views-layout.jade

-var SITE_TITLE = title ? title + ' | pjax example' : 'pjax example' 


if pjax
    title= SITE_TITLE
    #contents
        block contents

        
else
    doctype html
    html
        head
            meta( charset='UTF-8' )
            title= SITE_TITLE
        body
            ul#links
                li
                    a.pjax( href='/' ) 1
                li
                    a.pjax( href='/another' ) 2
            
            #contents
                block contents
            
            scripts( src='//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js' )   
            scripts( src='//cdnjs.cloudflare.com/ajax/libs/jquery.pjax/1.9.2/jquery.pjax.js' )
            scripts.
                $( document ).pjax( 'a', '#contents' );
                

Thank you!!!