Grape by Intridea https://github.com/ruby-grape/grape https://github.com/ruby-grape/grape is a nifty choice. It is somewhat opinionated, but lightweight enough

Grape by Intridea https://github.com/ruby-grape/grape https://github.com/ruby-grape/grape is a nifty choice. It is somewhat opinionated, but lightweight enough to have most of the features you'll need in writing an API Docs over at http://intridea.github.io/grape/ http://intridea.github.io/grape/