Issue #3432151 by Tom Konda, longwave: [jQuery 4] ajax.js and jquery.form.js use deprecated function $.parseJSON()

core/misc/ajax.js

@@ -554,7 +554,7 @@
         // Sanity check for browser support (object expected).
         // When using iFrame uploads, responses must be returned as a string.
         if (typeof response === 'string') {
-          response = $.parseJSON(response);
+          response = JSON.parse(response);
         }
 
         // Prior to invoking the response's commands, verify that they can be

core/misc/jquery.form.js

@@ -922,10 +922,6 @@
 
 				return (doc && doc.documentElement && doc.documentElement.nodeName !== 'parsererror') ? doc : null;
 			};
-			var parseJSON = $.parseJSON || function(s) {
-				/* jslint evil:true */
-				return window['eval']('(' + s + ')');			// eslint-disable-line dot-notation
-			};
 
 			var httpData = function(xhr, type, s) { // mostly lifted from jq1.4.4
 
@@ -943,7 +939,7 @@
 				}
 				if (typeof data === 'string') {
 					if ((type === 'json' || !type) && ct.indexOf('json') >= 0) {
-						data = parseJSON(data);
+						data = JSON.parse(data);
 					} else if ((type === 'script' || !type) && ct.indexOf('javascript') >= 0) {
 						$.globalEval(data);
 					}