Express Handlebars Template

app.js

const express = require('express');
const app = express();

// ----------------------------------------
// Dotenv
// ----------------------------------------
if (process.env.NODE_ENV !== "production") {
  require("dotenv").config();
}

// ----------------------------------------
// Body Parser
// ----------------------------------------
const bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({ extended: true }));

// ----------------------------------------
// Flash Messages
// ----------------------------------------
const flash = require('express-flash-messages');
app.use(flash());

// ----------------------------------------
// Method Override
// ----------------------------------------
app.use((req, res, next) => {
  let method;
  if (req.query._method) {
    method = req.query._method;
    delete req.query._method;
    for (let key in req.query) {
      req.body[key] = decodeURIComponent(req.query[key]);
    }
  } else if (typeof req.body === 'object' && req.body._method) {
    method = req.body._method;
    delete req.body._method;
  }

  if (method) {
    method = method.toUpperCase();
    req.method = method;
  }

  next();
});

// ----------------------------------------
// Public
// ----------------------------------------
app.use(express.static(`${ __dirname }/public`));

// ----------------------------------------
// Mongoose
// ----------------------------------------
const mongoose = require('mongoose');
app.use((req, res, next) => {
  if (mongoose.connection.readyState) {
    next();
  } else {
    require('./mongo')().then(() => next());
  }
});

// ----------------------------------------
// Logging
// ----------------------------------------
const morgan = require("morgan");
app.use(morgan("tiny"));
app.use((req, res, next) => {
  console.log();
  ["query", "params", "body"].forEach(key => {
    if (req[key]) {
      const capKey = key[0].toUpperCase() + key.substr(1);
      const value = JSON.stringify(req[key], null, 2);
      console.log(`${capKey}: ${value}`);
    }
  });
  next();
});

// ----------------------------------------
// Routes
// ----------------------------------------
const indexRouter = require('./routers/index');
app.use('/', indexRouter);

// ----------------------------------------
// Template Engine
// ----------------------------------------
const expressHandlebars = require('express-handlebars');
const helpers = require('./helpers');


const hbs = expressHandlebars.create({
  helpers: helpers.registered,
  extname: '.hbs',
  partialsDir: 'views/',
  defaultLayout: 'main'
});


app.engine('hbs', hbs.engine);
app.set('view engine', 'hbs');

// ----------------------------------------
// Server
// ----------------------------------------
const port = process.env.PORT ||
  process.argv[2] ||
  3000;
const host = 'localhost';


let args;
process.env.NODE_ENV === 'production' ?
  args = [port] :
  args = [port, host];

args.push(() => {
  console.log(`Listening: http://${ host }:${ port }\n`);
});


// If we're running this file directly
// start up the server
if (require.main === module) {
  app.listen.apply(app, args);
}

// ----------------------------------------
// Error Handling
// ----------------------------------------
app.use((err, req, res, next) => {
  if (res.headersSent) {
    return next(err);
  }

  if (err.stack) err = err.stack;
  
  res.status(500).render('errors/500', { error: err });
});