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

On Sat, May 4, 2013 at 1:37 PM, Gregg Caines <[email protected]> wrote:
> 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
>
>
> On Sat, May 4, 2013 at 1:33 PM, Martin Cooper <[email protected]> wrote:
>>
>> 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
>>
>>
>>
>>
>> On Sat, May 4, 2013 at 12:52 PM, Gregg Caines <[email protected]> wrote:
>>>
>>> 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
>>>
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