Back-end/ 라우터, 서버 js 분리

+const express = require('express');
+
+const router = express.Router();
+
+
+
+router.get('/', function(req,res) {
+
+  res.send({greeting: 'Hello React x Node.js'});
+
+});
+
+
+
+module.exports = router;
\ No newline at end of file

+
+const express = require('express');
+const app = express();
+const api = require('./apiRouter');
+
+app.use('/api', api);
+
+const port = 3002;
+app.listen(port, () => console.log(`노드서버 시작 : ${port}`));