How do you document your document structure?

[Stefan Klein]

Hi Couchusers,

all over my javascript source i got statements like
if (doc.field === 'VALUE') {
}
somewhere else:
if (doc.field === 'VALUE2') {
}

what id like to have is something like jsdoc which parses my source and
tells me which fields i use and which values i expect. (Would be easy to
spot typos etc. this way)
I tried jsdoc, created fake classes, it kind of works but is ugly.

Is there a better tool?

thanks,
Stefan