How do I call .NET core api get method in ajax

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Ajax

CORS

Hello,
I have a web api with basic Get, Put, Post and Delete methods on a localhost web server. the url is "http://localhost:5000/api/todoitem".
The Get method returns to the browsers the following response (Todo Items) :

[{"id":1,"name":"walk dog","isComplete":true},{"id":2,"name":"groceries","isComplete":false},{"id":3,"name":"laundry","isComplete":false},{"id":4,"name":"lssundry","isComplete":false}]

When I attempt an ajax request with the following syntax, The returned data / result is null, and I do not get any error messages.
I would greatly appreciate some help in resolving the problem.
Ajax request looks like this:

$.ajax({
        url: "http://localhost:5000/api/todoitem?callback=processIt",
        dataType: "jsonp",
        type: "POST",
        jsonpCallback: processIt, 
        contentType: "application/json; charset=utf-8",           
        success: function (result, status, xhr) {
            alert("In success function");
           // console.log(result + " : result");
           // console.log(result.contentType + " : result");
           // console.log(status + " : Status");
           // console.log(xhr + " : xhr");
            //processIt(result);                  
        },
        error: function (xhr, status, error) {
            console.log("Result: " + status + " " + error + " " + xhr.status + " " + xhr.statusText)
        }
    });
function processIt(r) {
   alert("Process it");
   alert(r);
   alert(r.data);        
}

Thank you very much,
Chieko

What I have tried:

Tried plain JSON and received CORS exception.