press any key to continue in nodejs

In node.js 7.6 and later you can do this:

const keypress = async () => {
  process.stdin.setRawMode(true)
  return new Promise(resolve => process.stdin.once('data', () => {
    process.stdin.setRawMode(false)
    resolve()
  }))
}

;(async () => {

  console.log('program started, press any key to continue')
  await keypress()
  console.log('program still running, press any key to continue')
  await keypress()
  console.log('bye')

})().then(process.exit)

Or if you want CTRL-C to exit the program but any other key to continue normal execution, then you can replace the “keypress” function above with this function instead:

const keypress = async () => {
  process.stdin.setRawMode(true)
  return new Promise(resolve => process.stdin.once('data', data => {
    const byteArray = [...data]
    if (byteArray.length > 0 && byteArray[0] === 3) {
      console.log('^C')
      process.exit(1)
    }
    process.stdin.setRawMode(false)
    resolve()
  }))
}