Here's a Python library with a CLI: Pypi: https://pypi.org/project/flattentool/ https://pypi.org/project/flattentool/ Docs: https://flatten-tool.readthedocs

Here's a Python library with a CLI: Pypi: https://pypi.org/project/flattentool/ https://pypi.org/project/flattentool/ Docs: https://flatten-tool.readthedocs.io/en/latest/ https://flatten-tool.readthedocs.io/en/latest/ It's maintained by Open Data Services Coop, where we use it as a component in several of our web & data pipeline tools for working with data that is published in a Data Standard.