python-json-logger
JSON Log Formatter for the Python Logging Package
Decision gist · record as of 2026-08-14
Yes. This is a lightweight, mature, actively maintained library with zero dependencies and permissive licensing. It solves a concrete problem—making Python logs machine-readable—with minimal friction. Install it if you need JSON-formatted logs for aggregation or centralized monitoring.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low install friction with no runtime dependencies.
- Actively maintained with recent releases; last commit 2026-08-09 and latest release 2026-03-29.
License · maintenance · safety
BSD-2-Clause (permissive) — BSD-2-Clause is permissive; you can use this package freely in commercial and open-source projects with minimal restrictions.
last release 2026-03-29 (138 days) · last repo commit 2026-08-09 · 267 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 122,072,365 downloads/mo, #301 on PyPI
Alternatives
Verify before relying
import logging
from python_json_logger import jsonlogger
logger = logging.getLogger()
logHandler = logging.StreamHandler()
formatter = jsonlogger.JsonFormatter()
logHandler.setFormatter(formatter)
logger.addHandler(logHandler)
logger.info('message')- Whether the package integrates with specific log aggregation platforms like ELK or Splunk
- Whether the package supports custom JSON field mapping or filtering
What it is and what it does
Python JSON Logger is a formatter for Python's standard logging module that converts log records into JSON format. Instead of plain-text log lines, it outputs structured JSON objects that can be parsed and indexed by log aggregation platforms. This makes logs machine-readable and enables easier filtering, searching, and analysis in production environments.
The package integrates directly with Python's built-in logging system as a handler formatter. It has no external runtime dependencies, making it lightweight to add to existing projects. The library is mature, actively maintained, and typed for use with static analysis tools.
Use it for
- Convert application logs to JSON format for ingestion into log aggregation systems.
- Standardize log output across microservices for centralized monitoring.
- Enable structured querying and filtering of logs in production environments.
- Integrate Python logging with services that expect JSON-formatted input.
- Improve log searchability by embedding context as JSON fields.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
This is a lightweight, mature, actively maintained library with zero dependencies and permissive licensing. It solves a concrete problem—making Python logs machine-readable—with minimal friction. Install it if you need JSON-formatted logs for aggregation or centralized monitoring.
Install
python-json-logger on PyPI
Before you install
Low install friction with no runtime dependencies. Actively maintained with recent releases; last commit 2026-08-09 and latest release 2026-03-29. Supports current Python versions (3.10–3.14).
Requires Python 3.10 or later.
License in practice
BSD-2-Clause is permissive; you can use this package freely in commercial and open-source projects with minimal restrictions.
Quickstart
import logging
from python_json_logger import jsonlogger
logger = logging.getLogger()
logHandler = logging.StreamHandler()
formatter = jsonlogger.JsonFormatter()
logHandler.setFormatter(formatter)
logger.addHandler(logHandler)
logger.info('message')Verify before relying
- Whether the package integrates with specific log aggregation platforms like ELK or Splunk
- Whether the package supports custom JSON field mapping or filtering
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 138 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 122,072,365 / month, #301 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | 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 |
Evidence: python_json_logger-4.1.0-py3-none-any.whl
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