Structured Logging for Python

Release v21.2.0 (What's new?).

structlog makes logging in Python faster, less painful, and more powerful by adding structure to your log entries. It has been successfully used in production at every scale since 2013, while embracing cutting-edge technologies like asyncio or type hints along the way.

Thanks to its highly flexible design, it’s up to you whether you want structlog to take care about the output of your log entries or whether you prefer to forward them to an existing logging system like the standard library’s logging module.

First steps:

  • If you’re not sure whether structlog is for you, have a look at Why….

  • If you can’t wait to log your first entry, start at Getting Started and then work yourself through the basic docs.

  • Once you have basic grasp of how structlog works, acquaint yourself with the integrations structlog is shipping with.

User’s Guide


Integration with Existing Systems

structlog can be used immediately with any existing logger. However it comes with special wrappers for the Python standard library and Twisted that are optimized for their respective underlying loggers and contain less magic.

Advanced Topics

API Reference

Getting Help

Please use the structlog tag on StackOverflow to get help.

Answering questions of your fellow developers is also a great way to help the project!

Project Information

structlog is dual-licensed under Apache License, version 2 and MIT, available from PyPI, the source code can be found on GitHub, the documentation at

We collect useful third party extension in our wiki.

structlog targets Python 3.6 and newer, and PyPy3.

structlog for Enterprise

Available as part of the Tidelift Subscription.

The maintainers of structlog and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source packages you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact packages you use. Learn more.

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