Callback in webix after post

I am using post method like this:

webix.ajax().post(“url.php”, {

				data1: value1,
				data2: value2
			},
				function (response) { 
				if (response) //for update it's either true or false
					console.log("all good");
				else
					console.log("ERROR");
			});

But I need to get some from php to response, how can I do that?

echo $data; // in php

console.log(response); //in JS response

doesn’t work

try response.json()