To subscribe to Bitstamp's activity.

subscribe_bitstamp.js

var WebSocket = require('ws');
var moment= require('moment');
var ws = new WebSocket('wss://s1.ripple.com:443/');
var bitstamp = "rvYAfWj5gh67oV6fW32ZzP3Aw4Eubs59B";
var account = bitstamp;
var info_subscribe={
  command: "subscribe",
  accounts: [bitstamp]
};

ws.on('open', function() {
    ws.send(JSON.stringify(info_subscribe));
});

ws.on('message', function(data, flags) {
    //console.log(flags);
    //console.log(data);
    var mom=moment().format('HH:mm:ss');
    console.log(mom);

    words=JSON.parse(data);
    //console.log(words["engine_result"]);
    //console.log(words["ledger_hash"]);
//console.log(words["transaction"]["hash"]);
//
var tx=words["transaction"];
if (tx) {
  var results=tx["hash"];
  var taker=tx["TakerGets"]
  //console.log(results);
  //console.log(taker);
if (taker) {
  console.log(taker);
  var curr=taker["currency"];
  var val=taker["value"];
  var longval=JSON.stringify(val);
  var line=curr + ' ' + longval;
  console.log(line);
} 

}
    // flags.binary will be set if a binary data is received
    // flags.masked will be set if the data was masked
});