Today I Learn...

• 비동기 처리 프로세스

• util.promisify()

• callback

• promise

• async/awiat

• 레퍼런스

1. util
   https://nodejs.org/dist/latest-v8.x/docs/api/util.html#util_util_promisify_original
2. request
   https://www.npmjs.com/package/request
3. callback
   http://callbackhell.com/
4. promise
   https://joshua1988.github.io/web-development/javascript/promise-for-beginners/
5. promiseify()
   https://helloinyong.tistory.com/94
6. async/awiat
   https://joshua1988.github.io/web-development/javascript/js-async-await/

++ JSON fakeData site : https://koreanjson.com/