Hey TranquilMarmot. I am working on a TypeScript code Generator for OpenAPI 2 and 3 that you might be interested in. It works on Node.js and web, provides strong typing (types generated against schema in the OpenAPI definition) and runtime type-checking to prevent the runtime data from deviating from TS types. We have been testing it in private for sometime; clients generated using this Code Generator have already been installed ~50K (and counting). I am looking for feedback so I'd be happy if you could try it out. My email is in my profile.