To append new data to json file in python.

json_append.py

import json

if file_exists(file_name):
    self.data = import_data_from_json(file_name)
    self.data.append(dict_data)
    export_data_to_json(file_name, self.data)
else:
    # Create new json file if it doesn't exist. Put the data in an array.
    export_data_to_json(file_name, [dict_data])


def export_data_to_json(folder_path, data):
    json_data = json.dumps(data, indent=4)
    with open(folder_path, "w") as f:
        f.write(json_data)


def import_data_from_json(json_file: str):
    with open(json_file, "r") as f:
        data = json.load(f)
    return data


def file_exists(path):
    return os.path.isfile(path)