server1.js

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

app.get('/', function(req, res) {
        res.send({hi: 'there'});
});

app.listen(1337, console.log('Server listening on http://localhost:1337'));

server2.js

const express = require('express');
const bodyParser = require('body-parser');
const app = express();

app.use(bodyParser.urlencoded({ extended: true }));

const store = [];

app.get('/', function(req, res) {
        res.send({hi: 'there'});
});

app.get('/articles', function(req, res) {
        res.send(store);
});

app.post('/articles', function(req, res) {
        store.push(req.body.content);
        res.send('Article added!');
});

app.listen(1337, console.log('Server listening on http://localhost:1337'));