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Nowadays, the REST (Representational State Transfer) is becoming the most commonly used way how to create, publish, and consume Web Services, exploiting JSON (JavaScript Object Notation) as the data exchange format. However, there are still no official standards for REST (like WSDL for Web Services) and for JSON (like XML Schema for the XML language). Next, there are no defined instructions how the resource versions should be managed. In this paper we focus on managing and generating REST resources based on the MDA (Model-Driven Architecture) principle which enables designing and maintenance of complex projects. We introduce a way how to describe the REST API in MDA and how to provide automatic evolution management between subsequent API versions derived from the original version. The proposed solution describes a novel model which represents REST requests and algorithms for providing evolution of this model based on changes done in the PIM (Platform-Independent Model) of MDA.