Expects socket.io-client, mongodb and ws to be installed with npm.

gistfile1.js

var WebSocket = require('ws')
var io = require('socket.io-client');
var MongoClient = require('mongodb').MongoClient;

console.log("Building websocket");

ws = io.connect('https://socketio.mtgox.com/mtgox')

console.log(ws);

ws.on('open', function () {
  console.log("opened");
});

ws.on('error', function (data) {
  console.log(data);
})

ws.on('connect', function (data) {
  console.log('connected')
});


var data_collection;

MongoClient.connect("mongodb://127.0.0.1:27017/mtgox", function (err, db) {
  console.log("connected to mongodb");
  console.log(err);
  data_collection = db.collection('mtgox_ticker');
});

ws.on('message', function (message) {
  if (data_collection)
    data_collection.insert(message, function (err, docs) {});
});