OpenAPI Tester
Oxygen XML Editor includes a testing tool for OpenAPI files. The tool provides the ability to inspect OpenAPI request responses and to ensure that they work as expected. It can be used for OpenAPI 3.x in JSON or YAML format.
To use the tool, select OpenAPI Tester from the menu. This opens a dialog box where you can specify the location of the OpenAPI file that you want to test.
This tool requires an additional add-on to be installed, so the first time you invoke the action, Oxygen XML Editor presents a dialog box asking if you want to install it. Once installed, you need to restart Oxygen XML Editor and the OpenAPI Tester action will invoke the tool.