NodeJS_Server.js

var SerialPort  = require('serialport2').SerialPort;
var portName = 'COM15'; // USB COM port number

var io = require('socket.io').listen(8000); // server listens for socket.io communication at port 8000
io.set('log level', 1); // disables debugging. this is optional. you may remove it if desired.

var sp = new SerialPort(); // instantiate the serial port.
sp.open(portName, { // portName is instatiated to be COM3, replace as necessary
   baudRate: 9600, // this is synced to what was set for the Arduino Code
   dataBits: 8, // this is the default for Arduino serial communication
   parity: 'none', // this is the default for Arduino serial communication
   stopBits: 1, // this is the default for Arduino serial communication
   flowControl: false // this is the default for Arduino serial communication
});

io.sockets.on('connection', function (socket) {
    // If socket.io receives message from the client browser then 
    // this call back will be executed.
    socket.on('message', function (msg) {
        console.log(msg);
    });
    // If a web browser disconnects from Socket.IO then this callback is called.
    socket.on('disconnect', function () {
        console.log('disconnected');
    });
});

var cleanData = ''; // this stores the clean data
var readData = '';  // this stores the buffer
sp.on('data', function (data) { // call back when data is received
    readData = data.toString(); // append data to buffer
    // if the letters '[' and ']' are found on the buffer then isolate what's in the middle
    // as clean data. Then clear the buffer. 
    //console.log(readData);
     if (readData.indexOf(']') >= 0 && readData.indexOf('[') >= 0) {
        cleanData = readData.substring(readData.indexOf('[') + 1, readData.indexOf(']'));
        readData = '';
        console.log("-- "+cleanData);
        io.sockets.emit('message', cleanData);
     }else if(readData.indexOf('[') >= 0){
        cleanData = readData.substring(readData.indexOf('[') + 1, readData.length);
        readData = '';
     }else if(readData.indexOf(']') >= 0){
        cleanData += readData.substring(0, readData.indexOf(']'));
        readData = '';
        console.log("-- "+cleanData);
        io.sockets.emit('message', cleanData);
     }else{
        cleanData += readData;
        readData = '';
     }
    //console.log(readData);
    //io.sockets.emit('message', readData);
});

//to connect on local network
// var util = require('util'),
// connect = require('connect'),

// connect.createServer(connect.static(__dirname)).listen(3000);
// util.puts('Listening on ' + port + '...');
// util.puts('Press Ctrl + C to stop.');