Doctor JS is a genius. He'll analyze your JavaScript code, complete with:
| polymorphism |  |
| prototypes | |
| exceptions | |
| callbacks | |
Just POST to http://doctorjs.org/analyze with the src field set to your source code, and the doctor will give you an analysis in JSON. Try it out!
Doctor JS respects your privacy. He won't share your code with anyone else, nor will he store your code longer than necessary to diagnose his own problems if they occur.