I found an article from 2017 on the zoom api ( Zoom API OpenAPI Specification | by Tim Slagle | Zoom Developer Blog | Medium ) which contains a valid openapi json ( https://raw.githubusercontent.com/zoom/api/master/openapi.v2.json ). Given the age of the article, not sure how much is out of date with the current api. But this version validates properly in swagger editor, and does not contain invalid references, like “oneof” (a 3.0 or greater only feature).