This paper briefly examines the interpretation of RestFul APIs, its methods, and responses. It explains how REST
(Representational State Transfer) is preferred over SOAP (Simple Object Access Protocol). Majority of the IOT devices are not
straightaway related to each other. They are connected via services that provide interfaces to users. In this paper, the author
addresses how the Internet of Things (IoT) can get profited from APIs. This paper also introduces a guide for Application
Programming Interface (API) documentation.