Sometimes an unformatted JavaScript code becomes nearly unreadable and difficult to understand. If you are in the habit of using such JavaScript codes, this little free web tool could be a boon for you. 

This piece of ugly looking unformatted code…
     

…transformed to…

on a click of a ‘Beautify’ button.

It comes with other features like indent with tab character OR 2, 4 or 8 spaces. Also it provides you with an option to preserve existing line breaks.
Check out JavaScript beautifier now.

JavaScript beautifier or indentation tool is a post from ReviewOfWeb