How to get data of JavaScript variable in Java Selenium webdriver?

Question

I want to test the json data which I'm getting after calling a REST api via JavaScript. The json data is stored in a JavaScript variable which i want to access via selenium webdriver in Java

Answer 1

Do you have to use selenium?
Testing controller isn't enough?

Answer 2

Maybe here you will find something useful
http://www.axelscript.com/2012/12/17/selenium-testing-javascript-variables/

Answer 3

Michal I've to do that in Selenium only