code: def _json_start(data: str, start: int = 0) -> Optional[int]:
      try:
          return data.index("{", start)
      except ValueError:
          return None
  
file_path: neptune-client/src/neptune/internal/utils/json_file_splitter.py
imports: import json
  from collections import deque
  from io import StringIO
  from json import JSONDecodeError
  from typing import Optional, Tuple
label_desc: Use image node_id 7 for calling the JsonFileSplitter obj's underlying member method code with example usage: obj._json_start(data, start) and returns: data, None