index.js

const express = require('express')
const path = require('path')
const cors = require('cors')
const PORT = process.env.PORT || 5000

express()
  .use(function(req, res, next) {
      res.setHeader('Access-Control-Allow-Origin', '*');
      res.setHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Accept, Accept-Version, Content-Length, Content-MD5, Content-Type, Date, X-Api-Version, X-Response-Time, X-PINGOTHER, X-CSRF-Token,Authorization,X-Authorization');
      res.setHeader('Access-Control-Allow-Methods', '*');
      res.setHeader('Access-Control-Expose-Headers', 'X-Api-Version, X-Request-Id, X-Response-Time');
      res.setHeader('Access-Control-Max-Age', '1000');
      next();
  })
  .set('views', path.join(__dirname, 'views'))
  .set('view engine', 'ejs')
  .get('/', cors(), (req, res) => res.render('pages/index'))
  .listen(PORT, () => console.log(`Listening on ${ PORT }`))