Delete Multiple sites ECMA script -

DeleteSite: function () {

var count=siteUrlArray.length;

var i = 0;

for (i = 0; i < siteUrlArray.length; i++) {

var url = siteUrlArray[i];

var clientContext = new SP.ClientContext(url);

var oweb = clientContext.get_web();

oweb.deleteObject();
         
}
clientContext.executeQueryAsync(function () { alert("Total site deleted= "+count); }, function () { });


}
-------------
Above functions shows how to delete multiple sites using ECMA Script. If any one is aware of bulk delete by JSOM using REST API plz do share.