how to get the localhost url in expressjs code example

Example 1: express get full url

var fullUrl = req.protocol + '://' + req.get('host') + req.originalUrl;

Example 2: sample express app

const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => res.send('Hello World!'))

app.listen(port, () => console.log(`Example app listening at http://localhost:${port}`))

Example 3: get full url nodejs

var fullUrl = req.protocol + '://' + req.get('host') + req.originalUrl;