basic example node.js (+express +jade) application configured to run in Heroku(views_layout.jade and views_home.jade should just be "layout.jade" and "home.jade" inside the "views" subdirectory)(public_home.js should just be "home.js" inside the "public" subdirectory)

authMiddleware.js

const jwt = require('jsonwebtoken');

const authService = {
  verify: (token) => {
    const decodedToken = jwt.verify(token, 'RANDOM_TOKEN_SECRET');
    return decodedToken.userId;
  },
  getUser: (userId) => {
    return getUserFromDB(userId);
  } 
};

module.exports = (req, res, next) => {
  try {
    const token = req.headers.authorization.split(' ')[1];
    const userId = authService.verify(token);
    if (req.body.userId && req.body.userId !== userId) {
      res.render('home', {sayHelloTo: 'stranger'});
    } else {
      req.user = authService.getUser(userId); 
      next();
    }
  } catch {
    res.status(401).json({
      error: new Error('Invalid request!')
    });
  }
};

package.json

{
  "name": "example",
  "version": "0.0.1",
  "private": true,
  "engines": {
    "node": "0.10.x",
    "npm": "1.2.x"
  },
  "dependencies": {
    "express": "*",
    "jade": "*"
  }
}

Procfile

web: node server.js

public_home.js

$(function(){
  alert('Hello world.');
});

server.js

var express = require('express');
var auth = require('./authMiddlware');
var app = module.exports = express();

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

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

app.get('/', function(req, res){
  res.render('home', {sayHelloTo: req.user.name});
});

if(!module.parent){
  app.listen(process.env.PORT || 3000, function(){
    console.log('up and running');
  });
}

views_home.jade

extends layout

block title
  title Overriden Example

block scripts
  script(src="http://code.jquery.com/jquery-1.10.0.min.js")
  script(src="/home.js")

block content
  p Hello #{sayHelloTo}.

views_layout.jade

doctype 5
html(lang="en")
  head
    block title
      title Example
    block stylesheets
  body
    block body
    block scripts