So I have been using this JS tester ...

http://www.webtoolkitonline.com/javascript-tester.html - I really like how it shows errors in the script before even running it and it shows exactly which line the error is on as well as telling you what the mistake is (read and expected). Are there any plugins for text editors that can do this ? I am using sublime text, I am guessing I need something that continuously runs the script to look for errors. Any suggestions ?