How to Create a Simple JSON Based Service

If I were writing like a really, really simple JSON based service, or something, maybe that would make sense. Yeah, let me tell you an example. Yesterday, one of our guys in our team needed a little tool to preview the result of a booster theme he was working on. And then I just created a quick and dirty file that we used to bring us to render the theme replacing some variables through the template engine,. So I started with the micro framework mode. I started with what's called minimal mode into a booty-us. Then we decided that it would like being cool to be able to upload multiple versions of the template and see the differences proposed to the other team members