Automate REST API testing with ROBOT framework

Robot Framework is language-agnostic open-source test automation framework for test automation and robotic process automation (RPA).
It is operating system and application independent. Several standard libraries are bundled with the framework, and there are separately developed external libraries galore that can be installed based on your needs. Libraries provide the actual automation and testing capabilities to framework by providing keywords. Test cases are written using a keyword-testing methodology written in a tabular format. You get more information about it here