dump method from the Python json package can be used to write a suitable Python object, usually a dictionary or list, to a JSON file. However, I discovered that Unix shell programs have problems working with such a JSON file. This turned out to be because this dump method does not end the last line with a newline character! According to the POSIX definition of a line in a text file, it needs to end with a newline character. (See here).
I replaced this:
json.dump(json_data, open("foobar.json", "w"), indent=4)
with open("foobar.json", "w") as json_file: json.dump(json_data, json_file, indent=4) json_file.write("\n") # Add newline cause Py JSON does not