api in npm for getting the number or list of dependent packages?

[Gregg Caines]

Hey all, does anyone know if npm has an API (or couchdb view) for getting the list (or just the count) of dependent packages of a given package ?  I suspect it does since npmjs.org has the info.

I know there's an npm mailing list, but it mysteriously won't let me post.  Thanks!

G

[Martin Cooper]

The simplest way is to grab the package metadata from the registry with this URL:

http://registry.npmjs.org/<package>/latest

That will get you a JSON version of the same object you see with 'npm view <package>', at which point you can just pluck out the 'dependencies' object.

--

Martin Cooper

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[Gregg Caines]

I'm actually looking for the opposite... the dependants, not the dependencies.  For a given package x, it's the list of all the packages that depend on x.

G

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[Isaac Schlueter]

Yes, you can use the "dependedUpon" view in the couchdb.

For example, to find all the packages that depend on "request":
http://isaacs.iriscouch.com/registry/_design/app/_view/dependedUpon?startkey=[%22request%22]&endkey=[%22request%22,{}]&group_level=2

That's what the npmjs.org site uses. Note that you can always dive
into the code to find out how it does stuff:
https://github.com/isaacs/npm-www