text: // start server by typing [  node app.js  ] in the terminal
  var express = require('express'); // npm i express
  var bodyParser = require('body-parser'); // npm i body-parser
  var app = express();
  
  // Parse URL-encoded bodies (as sent by HTML forms)
  app.use(bodyParser.urlencoded({
      extended: true
  }));
  
  // Parse JSON bodies (as sent by API clients)
  app.use(bodyParser.json());
  
  app.post('/LEDon', function (req, res) {
      console.log(Object.keys(req.body)[0]);
      console.log('LEDon button pressed!');
  });
  
  app.listen(5500);