Feature is coming.
Jul 19, 2010
Hi Jeff. The current JSON interface is a preview that is not especially performant and is missing authentication features. It is not meant for production, but to gauge interest and collect feedback. More performance and authentication is a scheduled feature for a release later this year.
If you are thinking about a particular application that has a specific deployment schedule, let us know and we'll take that into account when prioritizing features.
Aug 7, 2010
I'd like to second the request for authentication.
I think for monitoring, JSON can make a lot of sense, even for production.