Calculate the average number of dependencies in all modules on npm.

count-npm-dependencies.js

var request = require('request')
  , JSONStream = require('JSONStream')
  , deps = []
  
request('https://skimdb.npmjs.com/registry/_all_docs?include_docs=true')
  .pipe(JSONStream.parse('rows.*.doc'))
  .on('data', function (obj) {
    // project against outdated or broken package.json
    if (!obj['dist-tags']) return
    if (!obj['dist-tags'].latest) return
    if (!obj.versions[latest]) return
    // get latest deps count
    var latest = obj['dist-tags'].latest
    var count = obj.versions[latest].dependencies ? Object.keys(obj.versions[latest].dependencies).length : 0
    deps.push(count)
  })
  .on('end', function () {
    var sum = function (a, b) {return a + b}
    console.log(deps.reduce(sum) / deps.length)
  })