Getting 403 error when calling REST API from HTML/JS in sharepoint online

As from now you cannot create custom aspx files in SharePoint Online nor edit them with SharePoint designer.

I'm trying to launch an html with some js (angularJs and jquery) from the same site in Sharepoint Online. I'm connecting with some lists through the js but I'm getting constantly a 403 error (I'm site admin). The api call is this -

https://{domain}/sites/Employee_store/_api/web/Lists(guid'ee029e41-ecd4-4589-af56-4aa9db0c9bbc')/Items?$select=Title,Price

It works fine when directly called from the browser and returns data but from my .js it is showing the 403 error. Any Ideas?

Here it is part of the code:

function GetListItems($scope){  
    var formDigestValue = jQuery("#__REQUESTDIGEST").val();
    console.log(formDigestValue);  
    $.ajax({    
        url: _spPageContextInfo.siteAbsoluteUrl+"/_api/web/Lists(guid'ee029e41-ecd4-4589-af56-4aa9db0c9bbc')/Items?$select=Title,Price",
        method: "GET",    
        async: false,    
        headers: { "Accept": "application/json;odata=verbose", "X-RequestDigest": formDigestValue},  
        success: function(data){  
        $scope.ItemsFromOrders= data.d.results;
        },    
        error: function(sender,args){    
            console.log(args.get_message());    
        }    
    });    
}