How to have AJAX error direct to Developer Exception Page in ASP.NET Core MVC?

how would I redirect the browser to the Developer Exception Page to show the more detailed information?

From this doc about "Handle errors in ASP.NET Core", you would find:

Enable the Developer Exception Page only when the app is running in the Development environment. You don't want to share detailed exception information publicly when the app runs in production.

Normally, for better user experience, we do not display error page to client user directly.

If you really want to show browser user the Developer Exception Page while ajax request failed with some error, you can refer to the following sample.

$.ajax({
    url: '/Home/MyTestAction',
    dataType: "html",
    success: function (response) {
        //do something
    },
    error: function (response) {
        //console.log(response);
        document.write(response.responseText);
    }
});

Code of MyTestAction

public IActionResult MyTestAction()
{
    Convert.ToDateTime("hello");
    return Ok("success");
}

Test Result

If above error callback function executed, the content with detailed error message as below will be displayed in page