How to use

readUInt32LE

function

in

Array

process.stdin.on('readable', () => {
  var input = []
  var chunk
  while (chunk = process.stdin.read()) {
   input.push(chunk)
  }
  input = Buffer.concat(input)

  var msgLen = input.readUInt32LE(0)
  var dataLen = msgLen + 4

  if (input.length >= dataLen) {
   var content = input.slice(4, dataLen)
   var json = JSON.parse(content.toString())
   handleMessage(json)
  }
 })