Port compatibility on c9.io "Important: use process.env.PORT as the port and process.env.IP as the host in your scripts!"

workspace
nodejs

#1

const express = require(‘express’);
const bodyParser = require(‘body-parser’);

const app = express();

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

app.listen(5000, () => console.log(‘Webhook server is listening, port 5000’));strong text

How do I resolve this? Thank you all in advance.