Ask HN: Framework for REST

Can anyone recommend a good framework for a simple REST service with JSON? I know PHP, Python, Ruby and JavaScript (not a big fan of Node, though).

What I'm looking for is a framework that is fast and simple and preferably isn't bogged down by a lot of code aimed at outputting HTML, since I'll only need JSON.

I'm going to use the REST service in connection with single-page apps built with AngularJS.