Truncate long json objects so that it is human readable

json_visualizer.py

import sys
import json

max_item = 3

def visualize(obj: dict):
  if isinstance(obj, list):
    if len(obj) > max_item:
      return [visualize(o) for o in obj[0:max_item] + ["(%d items in total)" % len(obj)]]
    else:
      return [visualize(o) for o in obj]
  elif isinstance(obj, dict):
    if len(obj) > max_item:
      less_obj = {k: obj[k] for k in list(obj.keys())[0:max_item]}
      less_obj["(more)"] = len(obj)
      return {k:visualize(less_obj[k]) for k in less_obj}
    else:
      return {k:visualize(obj[k]) for k in obj}
  else:
    return obj

while True:
  jsonl = input()

  print(json.dumps(visualize(json.loads(jsonl)), indent=2))