I don't have an opinion about this particular project, but this just JSDoc, as mentioned in the readme: "Simply write a JSDoc-compliant comment block for a func

I don't have an opinion about this particular project, but this just JSDoc, as mentioned in the readme: "Simply write a JSDoc-compliant comment block for a function that represents your API endpoint". Yes, it's verbose, but its advantages over Typescript is that it work without any compilation step, while being standard enough to give helpful type-hint on any good enough IDE. Of course, if your project uses Typescript already, you should use Typescript instead, but if you just want to do a simple web page without any compilation step/package.json shenanigan, it's sometime nice to reach for JSDoc. EDIT: to answer your question, in JSDoc you can typedef your own custom objects[0], so you thankfully don't have to repeat your types everywhere. [0] https://devhints.io/jsdoc https://devhints.io/jsdoc