Getting started with express

express_code_simple.js

// Import express
let express = require('express')

// Create an instance of it
let ourApp = express()

// Use third party requests library
ourApp.use(express.urlencoded({extended: false}))

// get function for root URL
ourApp.get('/', function(req, res){
  res.send(`
    <form action="/answer" method="POST">
      <p>What color is the sky?</p>
      <input name="skyColor" autocomplete="off">
      <button>Submit answer</button>
    </form>
  `)
})

// post of that form
ourApp.post('/answer', function(req, res){
  if(req.body.skyColor == 'blue'){
    res.send(`
      <p>That is correct</p>
      <a href="/">Back to home</a>
      `)
  } else {
    res.send(`
      <p>That is not correct.</p>
      <a href="/">Back to home</a>  
    `)
  }
})

// Get request at /answer
ourApp.get('/answer', function(req, res){
  res.send(`<p>Are you lost?</p>`)
})

// Define port
ourApp.listen(3000)