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A node.js module for rolling dice and adding modifiers (e.g. "3d6+2"). This project was forked from node-roll.
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dice-tower is a node.js module for rolling dice and adding modifiers (e.g. "3d6+2"). This project was forked from node-roll.

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How To Use (From Shell)

Installation (via npm)

$ npm install -g @dsibilly/dice-tower


$ dice-tower 3d6+2
$ dice-tower d20
$ dice-tower d%

How To Use (As Library)

Installation (via npm)

$ npm install @dsibilly/dice-tower


Get an instance of the library:

var DiceTower = require('@dsibilly/dice-tower'),
  diceTower = new DiceTower();

Rolling a single die:

var oneDie = diceTower.roll('d6');
console.log(oneDie.result); // A pseudo-random number between 1 and 6 (inclusive)

Rolling multiple dice:

var twoTwenties = diceTower.roll('2d20');
console.log(twoTwenties.result); // A pseudo-random number between 2 and 40 (inclusive)

Rolling multiple sets of dice:

var bunchOfDice = diceTower.roll('2d20+1d12');
console.log(bunchOfDice.result); // A pseudo-random number between 3 and 52 (inclusive)

Rolling a percentage:

var chance = diceTower.roll('d%'); // ...or '1d100', 'd100', or '1d%'
console.log(chance.result); // A pseudo-random number between 1 and 100 (inclusive)

Simple calculation (+, -, *, /):

var attack = diceTower.roll('2d6+2');
console.log(attack.result); // A pseudo-random number between 3 and 8 (inclusive)

Seeing what was rolled, rather than the sum:

const yahtzee = diceTower.roll('5d6');
console.log(yahtzee.rolled); // `yahtzee.rolled` will return an Array, e.g. [5, 2, 4, 6, 1]

const blessedSneaker = diceTower.roll('2d20b1+1d4+5');
console.log(blessedSneaker.rolled); // blessedSneaker.rolled will return an Array containing an Array for each component that is a roll of the dice, in the order in which they occurred, e.g. [[19,3],[1]]

Getting the highest two dice of the set:

var pickBestTwo = diceTower.roll('6d20b2'); // roll 6 dice and sum the 2 highest results
console.log(pickBestTwo.calculations[1]); // pickBestTwo.calculations[0] is the same as .result, .calculations[1] is prior to the sum operation

Processing rolls without parsing a string:

// Same as 2d6+2:
const attack = diceTower.roll({
        quantity: 2,
        sides: 6,
        transformations: [ // List arbitrary pipeline operations to perform on the result.
            'sum', // Sum the result array of rolled dice together...
            ['add', 2] // ...and add 2 to that sum.
    console.log(attack.result); // Outputs a pseudo-random number between 4 and 14, inclusive.

Using custom transformations:

const dropOnes = function(results){
        return results.filter(function (result) {
            return result !== 1;
    noOnes = diceTower.roll({
        quantity: 5,
        sides: 4,
        transformations: [
            dropOnes, // remove any rolled 1s

Using a custom seed:

const srand = require('srand'); //
srand.seed(Math.floor(Math.random() * 1000));

diceTower = new DiceTower(function () {
  return srand.random();


Validating user input:

const userInput = 'this isn\'t a valid roll',
  valid = DiceTower.validate(userInput);

if (!valid) {
  console.error(`"${userInput}" is not a valid input string for node-roll!`);


Forked from Troy Goode's node-roll module. node-roll originally inspired by Phillip Newton's Games::Dice.


MIT License


Duane Sibilly


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