change the keys' names in a python json logger

Question

I want to change the keys' names in my python json logger:

import logging
from pythonjsonlogger import jsonlogger

def main() -> None:

    logger = logging.getLogger("myLovelyLogger")
    logger.warning("something terrible happened")

if __name__ == "__main__":

    logger = logging.getLogger("myLovelyLogger")
    handler = logging.StreamHandler()
    handler.setLevel(logging.INFO)

    formatter = jsonlogger.JsonFormatter(
        fmt="%(asctime)s %(name)s %(levelname)s %(message)s",
        datefmt="%d/%m/%y[ %H:%M:%S ]",
        json_indent=4
    )

    handler.setFormatter(formatter)
    logger.addHandler(handler)

    main()

When I run it, everything goes well, I just want to change some keys' names:

$ python3 main.py
{
    "asctime": "29/06/22[ 13:44:55 ]", # <--- change "asctime" to "time"
    "name": "myLovelyLogger",
    "levelname": "WARNING",            # <--- change "levelname" to "level"
    "message": "something terrible happened"
}

How can I achieve that?

Answer 1

Apparently I missed this option in the documentation.

    formatter = jsonlogger.JsonFormatter(
        fmt="%(asctime)s %(name)s %(levelname)s %(message)s",
        rename_fields={"asctime": "time", "levelname": "level"}, # <--- added this line
        datefmt="%d/%m/%y[ %H:%M:%S ]",
        json_indent=4
    )

Then I get the desired result 🙂:

$ python3 main.py
{
    "time": "29/06/22[ 14:10:12 ]",
    "name": "myLovelyLogger",
    "level": "WARNING",
    "message": "something terrible happened"
}