A tool to format a long minified JavaScript code (jCarousel)

I'd like to format JavaScript code of jCarousel to see what it does (to be able to debug it, and solve m开发者_C百科y problem). Visual Studio doesn't format it. Do you know any tool (free if you wish) to format long JS files?

This is how jCarousel minified code looks like:

this is what a formatted JS file:

The source code is available.. reading the project website sometimes helps.

https://github.com/jsor/jcarousel

Besides that, the unminified version is even included in the download archive...