Express? ์น ์ดํ๋ฆฌ์ผ์ด์ ์ ๋ง๋๋ ๋น ๋ฅด๊ณ ๊ฐ๋ฒผ์ด ํ๋ ์์ํฌ ๋๋ณด๊ธฐ Client : Front-end part Server : Back-end part (๋ฐ์ดํฐ๋ฅผ ๊ฐ์ ธ์ค๊ฑฐ๋ ์ ์ฅ) RESTful Services REST: Representational State Transfer CRUD Operations HTTP Methods GET: getting data POST: creating data PUT: updating data DELETE: deleting data API example GET /api/customers GET /api/customers/1 PUT /api/customers/1 DELETE /api/customers/1 POST /api/customers RESTful conven..