python-json-logger

JSON Log Formatter for the Python Logging Package

python-json-logger Permissive license BSD-2-Clause Active ★ 267 v4.1.0 released 2026-03-29

Install

python-json-logger on PyPI

pip

pip install python-json-logger

uv

uv add python-json-logger

poetry

poetry add python-json-logger

Package facts

License	BSD-2-Clause (permissive)
Python support	supports the current Python release (>=3.10)
Install friction	low — pure-Python wheel
Runtime dependencies	none
Maintenance	actively maintained — 137 days since the last release
Last repo commit	2026-08-09
First released	2013-02-25
Popularity	one of the top 1,000 most-downloaded packages on PyPI (30-day window, as of 2026-08-13)
Known vulnerabilities	none known (OSV.dev, checked 2026-08-13)

Evidence: python_json_logger-4.1.0-py3-none-any.whl

Development Status :: 6 - MatureIntended Audience :: DevelopersOperating System :: OS IndependentProgramming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Topic :: System :: LoggingTyping :: Typed

About python-json-logger

from the package's own PyPI description — quoted content, verbatim

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Python JSON Logger

Python JSON Logger enables you produce JSON logs when using Python's logging package.

JSON logs are machine readable allowing for much easier parsing and ingestion into log aggregation tools.

Documentation

Read as markdown · JSON record · Source repository · Homepage

AI interpretation — verify before relying

AI-generated interpretation of the package facts above; every digit, version, license, or vulnerability id it cites is grounded in the facts already shown on this page

Produces machine-readable JSON logs using Python's standard logging package, enabling easier parsing and ingestion into log aggregation tools.

Clean install with no runtime dependencies and low friction. Actively maintained as of March 2026 with recent activity; supports Python 3.10–3.14.

BSD-2-Clause is permissive and poses no restrictions on commercial or private use; you may use, modify, and distribute with minimal obligations.

Usage

pip install python-json-logger

import logging
from python_json_logger import jsonlogger

logger = logging.getLogger()
logger.addHandler(logging.StreamHandler())
logger.handlers[0].setFormatter(jsonlogger.JsonFormatter())
logger.info('message', extra={'key': 'value'})

Requires Python 3.10 or later.

Verdict: Mature, actively maintained JSON logging formatter with zero dependencies, permissive licensing, and no known vulnerabilities. Well-suited for production log aggregation pipelines where structured output is required.

Needs verification

Whether the package handles edge cases in JSON serialization of complex logging objects.
Performance characteristics when logging at high volume or with large payloads.

json logging pythonstructured logging formatterjson log outputpython logging json formatmachine readable logslog aggregation integrationjson logger handler