code: def to_json(
      fig, validate=True, pretty=False, remove_uids=True, engine=None
  ):
      """
      Convert a figure to a JSON string representation
  
      Parameters
      ----------
      fig:
          Figure object or dict representing a figure
  
      validate: bool (default True)
          True if the figure should be validated before being converted to
          JSON, False otherwise.
  
      pretty: bool (default False)
          True if JSON representation should be pretty-printed, False if
          representation should be as compact as possible.
  
      remove_uids: bool (default True)
          True if trace UIDs should be omitted from the JSON representation
  
      engine: str (default None)
          The JSON encoding engine to use. One of:
            - "json" for an engine based on the built-in Python json module
            - "orjson" for a faster engine that requires the orjson package
            - "auto" for the "orjson" engine if available, otherwise "json"
          If not specified, the default engine is set to the current value of
          plotly.io.json.config.default_engine.
  
      Returns
      -------
      str
          Representation of figure as a JSON string
  
      See Also
      --------
      to_json_plotly : Convert an arbitrary plotly graph_object or Dash component to JSON
      """
      # Validate figure
      # ---------------
      fig_dict = validate_coerce_fig_to_dict(fig, validate)
  
      # Remove trace uid
      # ----------------
      if remove_uids:
          for trace in fig_dict.get("data", []):
              trace.pop("uid", None)
  
      return to_json_plotly(fig_dict, pretty=pretty, engine=engine)
  
imports: import json
  import decimal
  import datetime
  import warnings
  from pathlib import Path
  from plotly.io._utils import validate_coerce_fig_to_dict, validate_coerce_output_type
  from _plotly_utils.optional_imports import get_module
  from _plotly_utils.basevalidators import ImageUriValidator
label_desc: Use image node_id 4 for calling a global function with example usage: to_json(fig, validate, pretty, remove_uids, engine) and returns: to_json_plotly