how to pass credentials for a webservice using jquery ajax call?

If you are doing cross domain request:

$.ajax({    url: "yoururl",    type: "GET",    dataType: 'json',    xhrFields: {         withCredentials: true    }});

Try using post for the method type, most webservices are secured and require transimssion using post and not Get

plus to help you debug the error and a response text to your error.

 $.ajax({     url: WEBSERVICE_URL,     type: "POST", //This is what you should chage     dataType: "application/json; charset=utf-8",     username: "admin", // Most SAP web services require credentials     password: "admin",     processData: false,     contentType: "application/json",     success: function () {         alert("success");     },     error: function (xhr, ajaxOptions, thrownError) { //Add these parameters to display the required response         alert(xhr.status);         alert(xhr.responseText);     }, });

My 2 cents on this.

I wasted a ridiculous amount of time on this issue, but I solved it by changing my request's method from a GET to a POST.

The strange thing is that both method types (GET/POST) work when called via Postman but it only managed to hit my Web API endpoint when I changed it to a POST method.

Note that in my case, I'm only passing the grant_type as I'm using Windows Authentication so I didn't to pass a username or password when posting.