code: def json_encode(o):
      """Encode an object as a JSON string
  
      o - object to encode
  
      returns a 2-tuple of json-encoded object + buffers of binary stuff
      """
      sendable_dict = make_sendable_dictionary(o)
  
      # replace each buffer with its metadata, and send it separately
      buffers = []
      encoder = make_CP_encoder(buffers)
      json_str = json.dumps(sendable_dict, default=encoder)
      return json_str, buffers
  
imports: import errno
  import json
  import logging
  import os
  import queue
  import sys
  import threading
  import uuid
  import numpy
  import zmq
  import cellprofiler_core.utilities.grid
  from cellprofiler_core.utilities.zmq._boundary import Boundary
  from cellprofiler_core.utilities.zmq.communicable.reply import LockStatusReply, Reply
  from cellprofiler_core.utilities.zmq.communicable.request import LockStatusRequest, Request
label_desc: Use image node_id 7 for calling a global function with example usage: json_encode(o) and returns: json_str,  buffers