설치하기

1.폴더 생성

mkdir workspace_express
cd workspace_express

2.package.json 생성

npm init

3. express 생성

npm install express

세팅

기본 구조

const.js

const SERVER_HOST = "127.0.0.1";
const SERVER_PORT = "5001";
module.exports.SERVER_HOST = SERVER_HOST;
module.exports.SERVER_PORT = SERVER_PORT;

error.js

function errorHandler(req, res) {
  const errorObj = {
    code: "404",
    message: "Error : not found",
  };
  return res.json(errorObj);
}
module.exports = errorHandler;

home.js

const express = require("express");
const router = express.Router();

const exampleHandler = require("../service/exampleService");

router.post("/example", exampleHandler);

module.exports = router;

exampleService.js

function exampleHandler(req, res) {
  console.log("hello world");
  res.end();
}

module.exports = exampleHandler;

express.js

const express = require("express");
const app = express();
const bodyParser = require("body-parser");
const routeHome = require("./router/home");
const routerError = require("./router/error");

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

app.use("/", routeHome);
app.use(routerError);

module.exports = app;

index.js

const { SERVER_HOST,SERVER_PORT } = require("./const/const");
const expressApp = require("./express");

expressApp.listen(SERVER_PORT,SERVER_HOST,()=>{
    console.log(`server start`);
})

실행하기

node index.js