The ctx.contentType() method in Javalin returns the request content type.
To implement this functionality, a Maven project 'javalin-request-body-content-type' is created.
Various classes like JsonUtil, EmployeeRequestDto, and the main application class (App) are defined.
The application handles POST requests to '/employees' endpoint, retrieves content type using ctx.contentType(), and returns a JSON response with the content type.