Express JS node framework did not respond to post() request - node.js

Question

I'm following a blog to build my first node API with express framework. But the POST request did not return a response.
const app = express();
require('./app/routes')(app, {});
app.listen(port, () => {
console.log('We are live on ' + port);
});
module.exports = function(app, db) {
console.log('reached2');
app.post('/notes', (req, res) => {
// You'll create your note here.
console.log('reached3');
res.send('Hello');
//res.end();;
});
};
Here are my console logs,
reached1
reached2
We are live on 8000
Here are my dependencies,
"dependencies": {
"body-parser": "^1.17.2",
"express": "^4.15.3",
"mongodb": "^2.2.28"
},
"devDependencies": {
"nodemon": "^1.11.0"
}
Im using the postman client to POST.
I tried replacing the fat arrow operator with an anonymous function but still doesnt work.
Please point the problem in this code.

Answer 1

If you want to keep your routes in a separate file (which is fairly standard practice), then you need to return a router and tell the express app to use it.
app.js
const express = require('express');
const routes = require('./routes')({});
const app = express();
app.use('/', routes);
app.listen(8080, () => {
console.log('Listening on 8080');
})
routes.js
const express = require('express');
module.exports = (db) => {
const router = express.Router();
router.post('/notes', (req, res) => {
res.send('Hello!');
})
// all your other routes here!
return router;
}
Or, alternatively if you want to do it without using using express.Router(), you could pass the app.
app.js
const express = require('express');
const app = express();
require('./routes')(app, {});
app.listen(8080, () => {
console.log('Listening on 8080');
})
routes.js
module.exports = (app, db) => {
app.post('/notes', (req, res) => {
res.send('Hello!');
})
}

Answer 2

Instead of writing route in a function you can use it directly. Below is the code snippet for the same:
const app = express();
app.listen(port, () => {
console.log('We are live on ' + port);
});
app.post('/notes', (req, res) => {
// You'll create your note here.
res.send('Hello');
});