index.js

const express    = require('express')
const bodyParser = require('body-parser')
const app        = express()

const port = process.env.PORT || 3000

app.use(bodyParser.json())
app.disable('etag')

const normalizedPath = require("path").join(__dirname, "routes");
require("fs").readdirSync(normalizedPath).forEach(function(file) {
  require("./routes/" + file)(app);
});

app.use(function(err, req, res, next) {
  console.error({err: err, message: err.message, errName: err.name, stack: err.stack}, 'Uncaught server error');
  res.status(500).json({message: 'Something went wrong.'});
})

if( process.env.NODE_ENV != 'production' && module.parent ) {
  module.exports = function(port) {
    const ref    = app.listen(port)
    const handle = ref.close.bind(ref)
    return handle
  }
  return
}

app.listen(port, function() {
  console.log(`Listening on ${port}...`)
})