get monthly npm statistics for given package name

npmMonthlyStats.js

function npmMonthlyStats(pkgName){
  var xhr=new XMLHttpRequest()
    , rows
    , obj={}
  ;
  xhr.open('GET','https://isaacs.iriscouch.com/downloads/_design/app/_view/pkg?group_level=2&start_key=%5B%22' + pkgName + '%22%5D&end_key=%5B%22' + pkgName + '%22,%7B%7D%5D', false);
  xhr.send();
  rows=JSON.parse(xhr.responseText).rows;
  rows.forEach(function(v,k){
    var d = v.key[1].slice(0,7);
    obj[d]  = (obj[d] || 0) + v.value;
  }); 
  return obj;
}