yo.js

const msgpack = require('msgpack'),
      os = require('os');

for(let r = 1; r < 4; r++) {
  console.log("\nRun #" + r + ":");
  const obj = {'abcdef' : 1, 'qqq' : 13, '19' : [1, 2, 3, 4]};

  let start = Date.now();
  for(let i = 0; i < 500000; i++) {
    JSON.parse(JSON.stringify(obj));
  }
  let stop = Date.now();
  console.log("\t      JSON: " + (stop - start) + "ms");

  start = Date.now();
  for(let i = 0; i < 500000; i++) {
    msgpack.unpack(msgpack.pack(obj));
  }
  stop = Date.now();
  console.log("\tMsgPack: " + (stop - start) + "ms");
}