Create an md5 hash string of a javascript object using crypto createHash, update, and digest hex

hash-object.js

var crypto = require('crypto');

exports.hashObject = function (object) {
  var hash = crypto.createHash('md5')
    .update(JSON.stringify(object, function (k, v) {
      if (k[0] === "_") return undefined; // remove api stuff
      else if (typeof v === "function") // consider functions
        return v.toString();
      else return v;
    }))
    .digest('hex');
  return hash;
}