node Multer configuration for saving files with extensions

multer_storage.js

var path = require('path');
var path = require('crypto');
var multer = require('multer');

var storage = multer.diskStorage({
  destination: './uploads/',
  filename: function (req, file, cb) {
    crypto.pseudoRandomBytes(16, function (err, raw) {
      if (err) return cb(err)

      cb(null, raw.toString('hex') + path.extname(file.originalname))
    })
  }
});

var upload = multer({ storage: storage })