#!/usr/bin/python3
  # -*- coding: utf-8 -*-
  
  import json, sys
  from pprint import pprint
  
  if not sys.stdin.isatty():
      JSON = json.loads(sys.stdin.read())
      pprint(JSON)
  else:
      print("Use this script with a pipe command.")
      print("")
      print("echo '...' | python3 prettyJson.py")
      print("or")
      print("cat ... | python3 prettyJson.py")