code: def json_string(json_object, indent=2, sort_keys=True):
      json_dump = json.dumps(
          json_object,
          indent=indent,
          sort_keys=sort_keys,
          separators=(",", ": "),
      )
      return unicode_string(json_dump)
  
imports: from __future__ import unicode_literals
  import importlib
  import json
  import numbers
  import re
  from builtins import bytes, str
  from datetime import datetime
  from functools import wraps
  from pathlib import Path
  from future.utils import text_type
  from snips_nlu.constants import END, ENTITY_KIND, RES_MATCH_RANGE, RES_VALUE, START
  from snips_nlu.exceptions import NotTrained, PersistingError
label_desc: Use image node_id 6 for calling a global function with example usage: json_string(json_object, indent, sort_keys) and returns: unicode_string