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Setup

Person is our sample view model:

public class Person
{
	public Guid Id { get; set; }
	public string FirstName { get; set; }
	public string LastName { get; set; }
	public int Age { get; set; }
}
    

We decorate our controller's existing Create action with the [Api] attribute:

public class HomeController : Controller
{
	[Api]
	public ActionResult Create(Person person)
	{
		person.Id = Guid.NewGuid();
		_people.Add(person);

		return View(person);
	}
}    
    

Let's Play

Request:

Response: