All of the API documentation on this site as well as all of the SDKs listed here are fully generated from the main Plex OpenAPI specification here, and I invite anyone in the community to contribute!

If you want to learn more about OpenAPI how to utilize it to document APIs, OpenAPI.Info is the most comprehensive OpenAPI reference I have seen out there.

The Plex OpenAPI specification, and all the SDKs by extension are managed from the Plex GitHub project.

Currently the project is primarily being maintained by Luke Hagar, and the community has made a few amazing contributions!