How can i fix json.decoder.JSONDecodeError ?

[JgKSuperstar]

Your current snippet raise different error

Error:
Traceback (most recent call last):
  File "***", line **, in <module>
    write_json(y)
  File "***", line **, in write_json
    file_data["emp_details"].append(new_date)
TypeError: list indices must be integers or slices, not str

I'm sorry, the code I gave you is wrong. No blocks try and except.