1.3.4 • Public • Published

Slot Machine Generator

npm version Install size

Create an extremely biased, web-based slot machine game.



  • Faux-panoramic reel animations (3D cylinder, without <canvas>)
  • Support for single/multi-line reels and pay-lines.
  • Pseudo-random selections by configured weight.
  • Configurable RNG (to make it less biased)
  • Configurable sound clips for reel animations.
  • Easy to set-up and customize. No dependencies.

Checkout the demo for examples of use.



Install the package into your project using NPM, or download the sources.

$ npm install slot-machine-gen


To add to an existing React or Vue project you can install this package using YARN.


$ yarn add react-slot-machine-gen


$ yarn add vue-slot-machine-gen


There are two ways you can use this package. One is by including the JavaScript/CSS sources directly. The other is by importing the module into your component.

Script include

After you build the distribution sources the set-up is fairly simple..

<script type="text/javascript" src="path/to/slot-machine.min.js"></script>
<link rel="stylesheet" href="path/to/slot-machine.min.css" media="all" />

<script type="text/javascript">
  slotMachine(container, reels, callback, options);

Module import

If your using a modern framework like Aurelia, Angular, React, or Vue

import SlotMachine from 'slot-machine-gen';
import 'slot-machine-gen/dist/slot-machine.css';

const slotMachine = new SlotMachine(container, reels, callback, options);

HTML markup

<div id="slot-machine" class="slot-machine"></div>

Reels configuration

Outside of a reel image source, symbols must contain the following:

Key Description Type
title Name of the strip symbol String
position Symbol center (in pixels) calculated from the strip top Number
weight Selection weight (>1 increases odds) Number


const reels = [
    imageSrc: 'path/to/image.png',
    symbols: [
        title: 'cherry',
        position: 100,
        weight: 2
        title: 'plum',
        position: 300,
        weight: 6
        title: 'orange',
        position: 500,
        weight: 5
        title: 'bell',
        position: 700,
        weight: 1
        title: 'cherry',
        position: 900,
        weight: 3
        title: 'plum',
        position: 1100,
        weight: 5

  // add more reels ...


Game options

Customization and overriding defaults can be done using the following options:

Option Description Type Default
reelHeight Reel background image height (in pixels) Number 1320
reelWidth Reel background image width. Number 200
reelOffset Reel background image vertical offset. Number 20
slotYAxis Slot vertical axis rotation (in degrees). Number 0
animSpeed Slot animation speed (in milliseconds) Number 1000
click2Spin Add event to display to spin reels Boolean true
rngFunc Custom RNG between 0 (inclusive) and 1 (exclusive) Function Math.random()
sounds Audio clip URLs for reels animation events Object {reelsBegin, reelsEnd}


This method returns an array of selected reel symbols that can be used to compute scoring, show animations, handle client interactions, etc..

const callback = function(symbols) {
  if (symbols[0].title === 'cherry' && symbols[1].title === 'cherry' && symbols[2].title === 'cherry') {
    window.alert("You're a winner!");

Customizing symbols

Creating a custom strip is fairly easy. What is most important is that each symbol, whether an image or blank space, contains a vertical position that can be measured by calculating the symbol center (in pixels) from the strip top. A Photoshop example has been provided with this package for reference.


CLI options

Run ESLint on project sources:

$ npm run lint

Transpile ES6 sources (using Babel) and minify to a distribution:

$ npm run build


If you fix a bug, or have a code you want to contribute, please send a pull-request with your changes. (Note: Before committing your code please ensure that you are following the Node.js style guide)


This package is maintained under the Semantic Versioning guidelines.

License and Warranty

This package is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose.

slot-machine-gen is provided under the terms of the MIT license


Marc S. Brooks

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npm i slot-machine-gen

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