A fast and efficient Node.js storage engine for stock market tick data and couple of modules for trading software development.
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This software was created in the era of node v0.2, so by modern times it is completelly and utterly ancient. This code is only left around as a description for the files format which is straightforward to read/write in any progamming language of your choice.


An extremely fast and efficient Node.js storage engine for raw stock market tick data as well as a couple of handy modules for trading software development.

node-stock is used by my proprietary blackbox trading company for all our robots. The code has been in production for more than a year now, so it is considered mature.

The code is well coverted by unit tests.


TickStorage, Symbols, Symbol

The main thing: a tick storage engine.

…and others

  • ExtraNumber - incredibly small yet vital module for internal price representation in node-stock.
  • ExtraDate - date and time calculations specifically helpful for algorithmic trading on NYSE, NASDAQ and CME;
  • WorkingDays - NYSE and NASDAQ working days calculator;
  • TimePeriod - defines a list of human-readable day time periods and a few calculations with it;
  • ExtraLog - console.log and formatter functions tailored to node-stock internal formats of price and date/time;
  • CandlesCalculator - Fast OLHC calculator over raw tick data;

Coding agreements

Price format

All prices in node-stock and derived software are stored in integer in 1/100 of a cent. I.e. $23,45 becomes 234500. To convert a conventional price to this format, use parseInt(price*10000). To show a human-readable version, use Number.humanReadablePrice() in ExtraNumber:


var price = 23.56;
price = parseInt(price*10000);

console.log("Price = %s", price.humanReadablePrice());

// or: 


ExtraLog.log("Price = %p", price);

Other agreements

Daystamp. A daystamp is a date in form of YYYYMMDD. It can be Number or String, so your code must handle both cases. See ExtraDate, it contains all you need for daystamp calculations.

Day minute. It's the number of a minute since 00:00 in the current day. I.e. 9:30 am becomes 570 (9*60+30=570). BTW, 24hr time is used thorough the project and so should you.

dbPath. Path to the tickers database, a folder. See below for database structure description.

Time zones management. You absolutely should run your software in the time zone of the stock exchange you are trading with. There are two ways of doing that:

1. Set TZ environment variable:

TZ=America/New_York node something.js 

2. Set process.env.TZ right at the start of your script before making anything else, especially before calling any Date methods:

console.log("Hello at %s", new Date());

// or: 

ExtraLog.log("Hello at %D", Date.unixtime());


Note: nodeunit must be launched in New York time zone:

TZ=America/New_York nodeunit test/


npm install stock.


Q: Why such a complex file format for ticks files?

A: It's not. If you actually start developing your own ticks database you will inevitably end up with a similar format. For a funny reference: this format is about forty times smaller and way faster than text files.

Q: Can you sell me raw ticks database for XXX or ZZZ?

A: Unfortunately, no. My license doesn't allow reselling of tick data. However, if you need some tick data strictly for R&D - please get in touch with me by email, we can work something out.

However, I have made one particular NYSE ticker publicly available so that you can play around with data. Should be enough for basic testing and development. It's anonymized, but the data is correct and intact; please don't try to figure out which company it is. You can find nyse.zip in Downloads area at Github.

Q: Augmentation of built-in classes?! You moron!

node-stock adds methods to Date (see ExtraDate) and Number (see ExtraNumber).

This practice is wrong. Please do not inherit it in your project. There are only extremely rare cases when it's okay to do so, and I consider these two modules an example of those.

Q: How do I run unit tests?

nodeunit test/

Database structure

Database path (dbPath) is a folder which contains tickers folders:


Each ticker folder contains TickStorage files, each named with a daystamp of that day:


Each file is in TickStorage format.

You don't need to traverse this folder structure manually: there are two handy modules that will do that for you: Symbols and Symbol. They abstract the actual file storage from you.

Here's a handy sinopsis:

Symbols = require('stock/Symbols');
Symbol = require('stock/Symbol');
TickStorage = require('stock/TickStorage');

var dbPath = '/Users/egor/tickers';

// initialise the class that works with tickers database (a folder of tickers folders) 
var symbols  = new Symbols(dbPath);

// now actually load the list of tickers (folders) available at that path
if (!symbols.load()) {
	console.log("Cannot load tickers database!");

// now let's iterate over all tickers available
var symbol;
while ((symbol=symbols.next())) {
	// mind that here "symbol" is a instantiated "Symbol" class

	// actually load list of days (files) at for that ticker (folder)
	if (!symbol.load()) {
		console.log("Cannot load days for %s", symbol.symbol);

	// prepare tick storage for the first day of that ticker
	var tickStorage = new TickStorage(dbPath, symbol.symbol, symbol.firstDay());

	// actually load the raw tick data for this symbol at that day
	if (!tickStorage.load()) {
		console.log("Cannot load ticks for %s/%s", symbol.symbol, symbol.firstDay());

	// iterate over market ticks and calculate total volume
	var tick, totalVolume=0;
	while ((tick=tickStorage.nextTick())) {
		if (tick.isMarket) {

	console.log("%s total volume = %d", symbol.symbol, totalVolume);


node-stock is triple-licensed.

If you are using node-stock in-house and do not redistribute the software, you can use it under LGPL v2.1. Essentially this means "do whatever you want as long as it's in-house". Feel free to provide commercial services or make zillions of money with this software. Just drop me an email so I can share your joy.

If you are redistributing node-stock, please consider it GPLv2 licensed.

If neither option is good for you, I can sell you a commercial license, which also includes my personal support. Contact me by email.


node-stock is created by Egor Egorov, me@egorfine.com. I welcome your comments and suggestions, please feel free to drop me an email.