Just to further this point. In my group we use several languages (python, java, node) for various services. It is extremely useful to define our spec via openap

Just to further this point. In my group we use several languages (python, java, node) for various services. It is extremely useful to define our spec via openapi and then generate servers/clients that conform to this. We use swaggerhub and their code gen and it's decent for multiple languages.