Cool, now I need to write a custom parser (no matter how simple it is) for your custom format. With no guarantee that it won’t evolve with breaking changes when

Cool, now I need to write a custom parser (no matter how simple it is) for your custom format. With no guarantee that it won’t evolve with breaking changes when you realize you forgot to handle some use cases and end up reinventing JSON. JSON is trivial as it is, don’t try to reinvent the wheel badly.