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TechnicalIndicators

A javascript technical indicators written in typescript.

Installation

Node.js versions >= 10

npm install --save technicalindicators

const SMA = require('technicalindicators').SMA;

Node.js versions < 10

For nodejs version below 10 use 1.x versions of this library.

Webpack

Make sure you have the following in your config file.

module.exports = {
  resolve: {
    mainFields: ["module", "main"]
  }
}

Browser

For browsers install using npm,

For ES6 browsers use

npm install --save technicalindicators

<script src="node_modules/technicalindicators/dist/browser.es6.js"></script>

For ES5 support it is necessary to include the babel-polyfill and respective file browser.js otherwise you will get an error. For example see index.html

npm install --save technicalindicators
npm install --save babel-polyfill

<script src="node_modules/babel-polyfill/browser.js"></script>
<script src="node_modules/technicalindicators/dist/browser.js"></script>

Pattern detection

Pattern detection is removed from version 3.0, if you need pattern detection use v2.0

All indicators will be available in window object. So you can just use

sma({period : 5, values : [1,2,3,4,5,6,7,8,9], reversedInput : true});

SMA.calculate({period : 5, values : [1,2,3,4,5,6,7,8,9]});

Playground

Playground with code completion

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Its free
Realtime price charts
Unified trading experience across exchanges
Price alerts
Realtime crypto screening using javascript (Find coins making high and low in realtime or anything you can write using this library and javascript in realtime)
Trading from charts,
Modify orders and ability to trade and create studies using javascript.

Home Screener Trade

Available Indicators

Other Utils

Chart Types

CandleStick Pattern

Search for all bullish or bearish using

var twoDayBullishInput = {
  open: [23.25,15.36],
  high: [25.10,30.87],
  close: [21.44,27.89],
  low: [20.82,14.93],
}

var bullish = require('technicalindicators').bullish;

bullish(twoDayBullishInput) //true

API

There are three ways you can use to get the indicator results.

calculate

Every indicator has a static method calculate which can be used to calculate the indicator without creating an object.

const sma = require('technicalindicators').sma;
var prices = [1,2,3,4,5,6,7,8,9,10,12,13,15];
var period = 10;
sma({period : period, values : prices})

const SMA = require('technicalindicators').SMA;
var prices = [1,2,3,4,5,6,7,8,9,10,12,13,15];
var period = 10;
SMA.calculate({period : period, values : prices})

nextValue

nextValue method is used to get the next indicator value.

var sma = new SMA({period : period, values : []});
var results = [];
prices.forEach(price => {
  var result = sma.nextValue(price);
  if(result)
    results.push(result)
});

getResult

This a merge of calculate and nextValue. The usual use case would be

Initialize indicator with available price value
Get results for initialized values

Use nextValue to get next indicator values for further tick.

var sma = new SMA({period : period, values : prices});
sma.getResult(); // [5.5, 6.6, 7.7, 8.9]
sma.nextValue(16); // 10.1

Note: Calling nextValue will not update getResult() value.

Precision

This uses regular javascript numbers, so there can be rounding errors which are negligible for a technical indicators, you can set precision by using the below config. By default there is no precision set.

const technicalIndicators = require('technicalindicators');
technicalIndicators.setConfig('precision', 10);

Contribute

Create issues about anything you want to report, change of API's, or request for adding new indicators. You can also create pull request with new indicators.

Environment dependencies

Typescript: Use typescript 2.0.0 other you might get max call stack reached error.

npm install -g typescript@2.0.0

TechnicalIndicators depends on the canvas package, which requires some dependencies to be installed. You can find the instructions to do that here. If you do not install these dependencies, expect to get this error message during the installation of TechnicalIndicators:

> canvas@1.6.6 install /Users/balupton/Projects/trading/technicalindicators/node_modules/canvas
> node-gyp rebuild

./util/has_lib.sh: line 31: pkg-config: command not found
gyp: Call to './util/has_lib.sh freetype' returned exit status 0 while in binding.gyp. while trying to load binding.gyp

Setup

git clone git@github.com:anandanand84/technicalindicators.git  # or use your fork
cd technicalindicators
npm run start

Running tests and getting coverage

npm test
npm run cover

Adding new indicators

Add tests for the indicator and make them pass.
(It would be better if a sample of the stockcharts excel is used for the test case.)
Add the indicator to the index.js and src/index.ts
Run build scripts: npm run build-lib && npm run generateDts && npm run start
Add it to README.md, with the link to the runkit url containing the sample.
Add indicator it to keywords in package.json and bower.json
Send a Pull Request.

Verify Documentation

node testdocs.js
open "http://localhost:5444/testdocs.html"

Donate

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