server.js

var express = require('express');
var app = express();
app.listen(8080, function () {
  console.log('start! express server on port 8080');
});

const wait = (ms) => new Promise((resolve) => setTimeout(resolve, ms));

app.get('/error/:codeNum', async function (req, res) {
  console.log('Call Error Api: ', req.hostname + req.url + ' ' + req.method);
  await wait(2000);
  const codeNum = req.params.codeNum;
  switch (codeNum) {
    case '400':
      res.status(400).json({ code: 400, message: '잘못된 요청입니다.' });
      break;
    case '4001':
      res.status(400).json({ code: 4001, message: '잘못된 요청입니다.' });
      break;
    case '401':
      res.status(401).json({ code: 4011, message: 'Unauthorized' });
      break;
    case '403':
      res.status(403).json({ code: 403, message: 'Forbidden' });
      break;
    case '404':
      res.status(404).json({ code: 404, message: 'Not Found' });
      break;
    case '500':
      res.status(500).json({ code: 500, message: 'Internal Server Error' });
      break;
    default:
      res.status(200).json({ code: 200, message: 'OK', payload: { title: '안녕하세요', contents: '반갑습니다' } });
      break;
  }
});

app.post('/error', function (req, res) {
  console.log('Call Error Api: ', req.hostname + req.url + ' ' + req.method);
  res.status(500).json({ code: '5000', message: '서버에 에러가 발생했습니다.' });
});