After installation of experess js we can write program
so express is a variable object, it can take the any type of value such as int, char, string etc
We have printing hello world program by express.js
const express = require('express' 4.7.2)
const app = express()
app.get('/', (req, res) => {
res.send('Hello World!')
})
app.listen(port, () => {
console.log(`Example app listening at http://localhost:${port}`)
})