Ruby on Rails is a great framework to build web applications, and it's widely used by many popular websites and services, including GitHub, Airbnb, and Shopify. It's mature, flexible, and powerful, with a huge community of developers who contribute to its documentation and libraries. Rails can be used to build CRUD (Create, Read, Update, Delete) web applications, as well as APIs, although it was not primarily designed for this purpose. However, Rails provides an "API mode" that allows developers to create APIs without rendering views, making it suitable for building RESTful APIs. In this article, we'll explore how to convert an existing Ruby on Rails project into an API using the RapidAPI platform.