what you will get if you search right are people who are experts with Node. Not a lot of recruiters try to source there. The reason is simple they do not know how. Well to do this without worry you need go no further than into your bag of tricks and pull out an old tried and true tool, a simple search with some extras
So to source within NPM you simply need to use a skill known as xraying, like the one below. Now the interesting thing is this will actually be a Github result once you open the pages.
Now notice that you need a name to search but no worries just go through a list of names
If you run the strings above in google you will get the results below.
Once you go into a profile they will have a gravtar, just click on it, follow it and you can get the info you need(you will need to sign into Wordpress.
If you need more info on X-raying see my blog post http://www.recruitingblogs.com/profiles/blogs/seeing-what-is-really-there-a
See my YouTube video on x-raying