Django REST Framework (source code), typically abbreviated "DRF", is a Python library for building web application programming interfaces (APIs).
The official DRF tutorial is one of the best first-party pieces of documentation on any open source project. The rest of the DRF docs are spectacular as well.
Django: Building REST APIs is the first part in an excellent multi-part series on DRF:
TLT: Serializing Authenticated User Data With Django REST Framework
Building an API with Django REST Framework and Class-Based Views
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