Pi-Lite Stock Ticker example made in Node.js http://openmicros.org/index.php/articles/94-ciseco-product-documentation/raspberry-pi/302-pi-lite-stock-ticker

gistfile1.js

var http = require('http');
var xmldoc = require('xmldoc');
var SerialPort = require("serialport").SerialPort;

function parseXML(data) {
  var document = new xmldoc.XmlDocument(data);

  var symbol = document.valueWithPath("Data.Symbol"); 
  var price = document.valueWithPath("Data.LastPrice"); 

  // console.log(symbol +": "+ price);

  if (typeof symbol !== "undefined") {
    stockResult += symbol +": "+ price +" ";
  }
}

function quotelookup(symbol) {

  var options = {
    hostname: 'dev.markitondemand.com',
    port: 80,
    path: '/Api/Quote?symbol='+ symbol,
    method: 'GET'
  };

  var result = "";

  var req = http.request(options, function(res) {
    console.log('GET: ' + symbol + ' STATUS: ' + res.statusCode);
    //console.log('HEADERS: ' + JSON.stringify(res.headers));

    res.setEncoding('utf8');
    res.on('data', function (chunk) {
      // console.log('BODY: ' + chunk);

      result = parseXML(chunk);
    });
  });

  req.on('error', function(e) {
    console.log('problem with request: ' + e.message);
  });

  // write data to request body
  req.write('data\n');
  req.write('data\n');
  req.end();

}

var stockResult = [];
var stocklist = ['AAPL','FB','GOOG','MSFT','YHOO','DOWJ'];
var ticker_speed = 80;

stocklist.forEach(function(item) {
  quotelookup(item);
});

var serialPort = new SerialPort("/dev/ttyAMA0", {
  baudrate: 9600
}, false);

serialPort.open(function () {
  console.log('Connected to Pi Lite');

  serialPort.write("$$$SPEED"+ ticker_speed +"\r" + stockResult, function(err, results) {
    if (err) {
      console.log('Error: '+ err);
    }

    //console.log('Result: '+ results);
    process.exit();
  });  
});