Display temperature and brightness on webpage

If you're using Android, iOS or Mac OS I'd suggest Web Bluetooth.

There's an example here that would be perfect: http://www.espruino.com/Web+Bluetooth+Dashboard#realtime-dashboard

Where it says:

connection.write("setInterval(function(){Bluetooth.println(JSON.stringify({light:Puck.light()}));},100);NRF.on('disconnect', function() {reset()});\n",

change it to:

connection.write("setInterval(function(){Bluetooth.println(JSON.stringify({light:Puck.light(), temp:E.getTemperature()}));},1000);NRF.on('disconnect', function() {reset()});\n",

However I seem to recall you're on win 10? If so web bluetooth will be available in a few months but it's not there yet and @Pi's advice is spot on