[Greasemonkey] Any syntax tester/ indenter around for gm?

[Vikas Pandey]

OK. There is that shell and that compiler.

I am using Crimson Editor for javascript/ gm scripts. It has syntax 
highlighting, and bracket-matching, but that is almost all it has.

It doesn't have any option to arrange entire script in a readable format 
by putting indents, etc. It can't even preprocess the error to check for 
logical errors like mismatched bracket, undeclared var, wrongly spelled 
command.

Is there any such pre-processor for JS/GM that would highlight errors in 
advance and prevent us from staring at the webpage when our script 
doesn't show.

Thanks.
-- 
Vicky