send req.body using res.send

app.js

var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var cors = require('cors');

var indexRouter = require('./indexRoute');
var usersRouter = require('./usersRoute');

var app = express();

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(cors());
// app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

module.exports = app;

indexRoute.js

var express = require('express');
var router = express.Router();

/* GET home page. */
router.get('/', function(req, res, next) {
  res.send('barnyar thar');
});

router.post('/bar', async (req, res) => {
  try {
      console.log("member register request check");
      console.log("req.body : ", req.body);
      //req.body :  { userId: 'tere', password: '1234', nickname: 'te' }
      res.send(req.body) //===> { userId: 'tere', password: '1234', nickname: 'te' }
  } catch (e) {
      console.log(e);
  }
});


module.exports = router;