index.js

#!/usr/bin/env node
require('dotenv').load()

const app = require('./app')
const debug = require('debug')('genius-analyzer-server:server')
const http = require('http')
const normalizePort = require('./utils/normalizePort')

const onError = error => {
  if (error.syscall !== 'listen') {
    throw error
  }

  const bind = typeof port === 'string' ? 'Pipe ' + port : 'Port ' + port

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges')
      process.exit(1)
      break
    case 'EADDRINUSE':
      console.error(bind + ' is already in use')
      process.exit(1)
      break
    default:
      throw error
  }
}

const onListening = () => {
  const addr = server.address()
  const bind = typeof addr === 'string' ? 'pipe ' + addr : 'port ' + addr.port
  console.log('Listening on ' + bind)
}

const port = normalizePort(process.env.PORT || '3000')
app.set('port', port)

const server = http.createServer(app)

server.listen(port)
server.on('error', onError)
server.on('listening', onListening)