Ask HN: Flask like micro framework in Scala

I am working on 30 day blog series where in I am writing about a new technology every day https://www.openshift.com/blogs/learning-30-technologies-in-30-days-a-developer-challenge. For my last day I am thinking to write about Scala. I am looking for a micro-framework which can easily expose REST JSON web services. Then, I can use my already written AngularJS client. Any recommendations?