dogstack/lib/normalizePort.js

a popular-choice grab-bag framework for teams working on production web apps

module.exports = normalizePort

function normalizePort (val) {
  const port = parseInt(val, 10)

  if (isNaN(port)) {
    // named pipe
    return val
  }

  if (port >= 0) {
    // port number
    return port
  }

  return false
}