spray/spray-json — pull request #117 by chris-martin (2014-09-15 20:56:59+00:00)
Title: Add jsonFormat0 for fieldless case classes

Implemented [maspwr's suggestion](https://github.com/spray/spray-json/issues/41#issuecomment-47947123) from #41:

> What would be nice is if spray-json at least serialized a parameterless case class as an empty JsObject.

This fits in pretty naturally with the other product formats.