You can use JSON using the accept parameter of the API. The url structure remains the same. It also supports YAML and I found that's easiest to read for LLMs.

Previous example but in JSON:

https://uithub.com/upstash/docs/tree/main/qstash?accept=appl...

Is there any reason to prefer JSONL besides it being more efficient to edit? I'm happy to add it to my backlog if you think it has any advantages for LLMs