You can use a functional testing tool such as SoapUI to view the REST API input and output parameters.
Download the WADL file and then import the file into the functional testing tool to create a REST project.
The following image shows the input parameters in the SoapUI for the createPerson REST API:
Input parameters for createPerson REST API
The WADL file produced in WebSphere environments might not import correctly into SoapUI. If the input parameters do not appear in SoapUI, edit the WADL file to remove the