[Solved] Writing JSON in Python

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json.dump() takes two arguments, the Python object to dump and the file to write it to.

Make your changes first, then after the loop, re-open the file for writing and write out the whole data object:

with open("app.json") as json_data:
    data = json.load(json_data)

for d in data['employees']:
    d['history'].append({'day': 01.01.15, 'historyId': 44, 'time': 12.00})

with open("app.json", 'w') as json_data:
    json.dump(data, json_data)

This essentially replaces the file contents with the JSON-serialised new data structure.

solved Writing JSON in Python