dirToJson.js

var fs = require('fs')
var path = require('path')
var argCount = process.argv.length
var lastArg = process.argv[argCount - 1]

// From
// http://stackoverflow.com/questions/11194287/convert-a-directory-structure-in-the-filesystem-to-json-with-node-js
function dirTree(filename) {
  var stats = fs.lstatSync(filename),
    info = {
      path: filename,
      name: path.basename(filename)
    }

  if (stats.isDirectory()) {
    info.type = "folder"
    info.children = fs.readdirSync(filename).map(function(child) {
      return dirTree(filename + '/' + child)
    })
  } else {
    // Assuming it's a file. In real life it could be a symlink or
    // something else!
    info.type = "file"
  }

  return info
}

var text = JSON.stringify(dirTree(lastArg))

process.stdout.write(text)