This is a Node.js server script using johnny-five and socket.io that updates a web page with values taken from an Arduino with a LDR and potentiometer connected.

server.js

var app = require('http').createServer(handler),
  io = require('socket.io').listen(app),
	fs = require('fs'),
	five = require('johnny-five'),
	board,
	photoresistor;

app.listen(8000);

// function for serving the static HTML page
function handler(request, response) {
	fs.readFile(__dirname + '/index.html',
		function (error, data) {
			if(error) {
				response.writeHead(500);
				return response.end('Error loading index.html');
			}
			// If all is well, serve up the file
			response.writeHead(200);
			response.end(data);
		}
	);
}

board = new five.Board();

board.on('ready', function() {

	// Create a new photoresistor instance on pin A0
	photoresistor = new five.Sensor({
		pin: "A0",
		freq: 250
	});

	// Create a new `potentiometer` hardware instance.
    potentiometer = new five.Sensor({
	    pin: "A5",
	    freq: 250
    });

    // "read" get the current reading from the potentiometer
    potentiometer.scale([0, 10]).on('read', function(error, potVal) {
    	board.emit('potVal', Math.floor(this.scaled) );
  	});


	// Get the reading from photoresistor (scaled between 0 and 255)
	photoresistor.scale([0, 255]).on('read', function(error, photoVal) {
		board.emit('photoVal', Math.floor(this.scaled));
		//console.log("value from johnny-five" + value);
	});	
});

// Broadcast reading to web page using socket.io
io.sockets.on('connection', function(socket) {
	board.on('photoVal', function(val) {
		socket.emit('value', { val: val });
	});
	board.on('potVal', function(value) {
		socket.emit('reading', { value: value });
	});
	
});