express sample code

app.js

const express = require('express');
const passport = require('passport');

require('dotenv').config();

const indexRouter = require('./routes/index');
const port = process.env.PORT || 3000;
const app = express();

app.use(passport.initialize());
app.use(express.json());
app.use(express.urlencoded({ extended: false }));

app.use('/', indexRouter);

app.listen(port, () => {
  console.log(`server is running on ${port}`);
});

index.js

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

router.get('/', (req, res) => {
  res.send('hello');
});

module.exports = router;