UI Script helper for making GlideAjax calls in ServiceNow and returning JSON

EasyGlider.js

//UI Script
function callFunctionJSON(className, fnName, params, callback){
	var cl = new GlideAjax(className);
	cl.addParam('sysparm_name', fnName);
	if (params){
		Object.keys(params).forEach(function(k){
		    cl.addParam('sysparm_' + k, params[k]);
		});
	}
	cl.getXMLAnswer(function(resp){
	    callback(JSON.parse(resp));
	});
}

//example usage:

//Script Include:
var EasyGliderTest = Class.create();
EasyGliderTest.prototype = Object.extendsObject(AbstractAjaxProcessor, {
    findUsersByName: function(){
		var userName = this.getParameter('sysparm_username');
		var users = new GlideRecord('sys_user');
		users.addQuery('name','CONTAINS', userName);
		users.query();
		var resp = [];
		while (users.next()){
			resp.push({
				name: users.getDisplayValue(),
				id: users.getValue('sys_id')
			});
		}
		return JSON.stringify(resp);
	},
    type: 'EasyGliderTest'
});

//UI Action or elsewhere
callFunctionJSON('EasyGliderTest', 'findUsersByName',{'username':'Bridget'}, function(users){
    console.log(users)
});