The file size is 1413MB.  There are many entries in the database being exported that don't have comma separators.  

The data I'm exporting is my server's StackStorm workflow execution with the following command:

'mongoexport -d st2 -c workflow_execution_d_b -o 05-03-2020_workflows_export.json --pretty'

I found the issue when attempting to parse the JSON with Python.

def parse(file_name):
  with open(file_name, 'r') as file:
    json_data = json.load(file)
  print(json.dumps(json_data))

parse('05-03-2020_actions_export.json')

Which gives the error:

Traceback (most recent call last):
File "st2_utils/json_parser.py", line 10, in <module>
parse('05-03-2020_actions_export.json')
File "st2_utils/json_parser.py", line 6, in parse
json_data = json.load(file)
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/_init_.py", line 293, in load
return loads(fp.read(),
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/_init_.py", line 357, in loads
return _default_decoder.decode(s)
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/json/decoder.py", line 340, in decode
raise JSONDecodeError("Extra data", s, end)
json.decoder.JSONDecodeError: Extra data: line 9130 column 2 (char 301892)