import json

# Fills my Json File with object from 0 to 299
counter = 0
data = [{counter: {'question': '', 'answer': ''}}]

while counter < 300:
    data.append({counter: {'question': '', 'answer': ''}})
    counter += 1

json_string = json.dumps(data)
with open('jsontest.json', 'w') as file:
    file.write(json_string)