I don't know about a Python library or json converter.  But MarcEdit can do it.

					Steve McDonald
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-----Original Message-----
From: Code for Libraries <[log in to unmask]> On Behalf Of Goodwin, Shawn
Sent: Monday, March 4, 2019 3:03 PM
To: [log in to unmask]
Subject: [CODE4LIB] MARC21 to MODS

Hi All,

I was looking at this website: https://www.loc.gov/standards/mods/mods-mapping.html#mapping

Is there a python library (or even just a JSON file) that transforms MARC to MODS?

--
Shawn Goodwin
Metadata Control Analyst | ATLA<http://www.atla.com/>
300 South Wacker Drive, Suite 2100
Chicago, IL 60606