Build Your REST API with Spring Course. I published my first REST with Spring tutorials over four years ago and after 900,000 readers and over a thousand personal questions via email, I finally realized there was a huge tutorial gap in the ecosystem. I needed to learn what makes a good API difficult and I couldn’t find anything that would help me speed things up. It took me three years, over 10 production-ready APIs from scratch and a significant number of bugs to fully understand how to build a really good API. Sure there were tutorials and random code examples but nothing coherent. Nothing starts as a guide to the challenges of building a mature API with Spring. The education gap between API beginners and API pros remains large. The web landscape has changed significantly in the last few years and REST APIs have grown exponentially. Today most non-trivial applications require exposing an API and this trend continues to grow. The APIs are also public, which means you have to get them from the start as changing them is very expensive. There’s never been a better time to learn the ins and outs of REST with Spring.