laco.js

const https = require('https')
const pkgJSON = require('./package.json')
const deps = Object.assign({}, pkgJSON.dependencies, pkgJSON.devDependencies)

const list = Object.keys(deps).map((key) => {
  return new Promise((resolve, reject) => {
    const pkg = encodeURIComponent(key)
    https.get(`https://registry.npmjs.com/${pkg}/latest`, (res) => {
      const { statusCode } = res
      const contentType = res.headers['content-type']
      let error
      if (statusCode !== 200) {
        error = new Error('Request Failed.\n' +
                          `Status Code: ${statusCode}`)
      } else if (!/^application\/json/.test(contentType)) {
        error = new Error('Invalid content-type.\n' +
                          `Expected application/json but received ${contentType}`)
      }
      if (error) {
        res.resume()
        reject(error)
      }

      res.setEncoding('utf8')
      let rawData = ''
      res.on('data', (chunk) => { rawData += chunk })
      res.on('end', () => {
        try {
          const parsedData = JSON.parse(rawData)
          resolve([key, deps[key], parsedData.version])
        } catch (e) {
          reject(e)
        }
      })
    }).on('error', reject)
  })
})

Promise.all(list).then((result) => {
  // result
  //   => [
  //        'package name', 'current version', 'latest version'
  //   ]
}).catch((e) => {
  throw new Error(e)
})