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Django: ValueError: unable to configure handle "loggers"

Django: ValueError: unable to configure handle "loggers"

David Y.

—

The ProblemJump To Solution

You are trying to configure logging for your Django application, but keep getting the following error message:

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ValueError: Unable to configure handler 'loggers'

This is your logging configuration dictionary in settings.py:

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import os

LOGGING = {
    "version": 1,
    "disable_existing_loggers": False,
    "root": {
        "handlers": ["console"],
        "level": "WARNING",
    },
    "handlers": {
        "console": {
            "class": "logging.StreamHandler",
        },
        "loggers": {
            "django": {
                "handlers": ["console"],
                "level": os.getenv("DJANGO_LOG_LEVEL", "INFO"),
                "propagate": False,
            },
        },
    },
}

What is the cause of this error and how do you fix it?

The Solution

The error is caused by a mistake in the structure of the logging dictionary. In the dictionary above, loggers is an element of handlers, but it should be a top-level element, per the Django documentation. A bare-bones LOGGING dictionary should be structured as follows:

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LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        # add formatters here (optional)
    },
    'handlers': {
        # add handlers here
    },
    'loggers': {
        # add loggers here
    },
}

Here is a correctly indented version of the LOGGING dictionary:

Click to Copy
import os

LOGGING = {
    "version": 1,
    "disable_existing_loggers": False,
    "root": {
        "handlers": ["console"],
        "level": "WARNING",
    },
    "handlers": {
        "console": {
            "class": "logging.StreamHandler",
        },
    },
    "loggers": {
        "django": {
            "handlers": ["console"],
            "level": os.getenv("DJANGO_LOG_LEVEL", "INFO"),
            "propagate": False,
        },
    },
}
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