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How to pluralize words in JavaScript in different languages?

How to pluralize any word in different languages using JavaScript?


Today, I'm going to show you how to pluralize any word in JavaScript (Node.js or Browser) in almost any language!

I've developed a very simple, but powerful module in JavaScript that will help you to achieve this goal. It's called Numerous.

I'm going to start with Node.js example.

Pluralizing words in Node.js


First of all, let's start by installing the required dependency:

npm i -S numerous

A Simple Example

Then, let's create a simple Node script:

const numerous = require('numerous');

// Returns "apple".
numerous.pluralize('en', 1, {
  one: 'apple',
  other: 'apples'

// Returns "cats".
numerous.pluralize('en', 2, {
  one: 'cat',
  other: 'cats'

API Explained

numerous.pluralize(locale, calue, variants) static function accepts three required arguments:

  • locale — a locale name, e.g. en for English, ru for Russian, etc.
  • value — a value your pluralization should be based on
  • variants — is an object that holds all possible pluralization forms of the word you want to pluralize

The complete list of all supported languages could be found in Numerous locales document.

Key names for all possible variants could be found in the specific locale file. For example for English it could be found in English locale definition file.

e.g. for English the variant keys are:

  • one — single form of the word, e.g. "child"
  • other — plural form of the word, e.g. "children"

Loading Locales

In Node.js, the Numerous will load all the locales automatically when requested and cache them for later use. Locale definitions files are loaded only on demand (lazy-loaded) to preserve memory.

However, in Browser you will need to load each required locale manually before using it.

Using Instantiation

It's easy to use the static form of the API explained above, however, it's also possible to create an instance of the pluralizer in order to preconfigure it with some specific locale. It will allow you to reduce number of arguments you will require to pass when calling the pluralization function.

So, to create an instance of specific locale pluralizer call: numerous.create(localeName);, e.g. numerous.create('en');.

Then you can use it's pluralize(value, variants) method with only two arguments:

// Creating instances for specific locales.
const englishPluralizer = numerous.create('en');
const russianPluralizer = numerous.create('ru');

// Returns "apple".
englishPluralizer.pluralize(1, {
  one: 'apple',
  other: 'apples'

// Returns "яблока".
russianPluralizer.pluralize(2, {
  one: 'яблоко',
  few: 'яблока',
  many: 'яблок'

Pluralizing words in Browser using vanilla JavaScript

In order to use Numerous in the browser environment you will need to add numerous.js as well as all required locales to your HTML-document:

    <!-- Before closing the body: -->
    <script src="vendor/numerous/numerous.js"></script>
    <script src="vendor/locales/en.js"></script>

You can install Numerous using npm or bower. Also you could use it with Gulp or WebPack to e.g. prebuild the list of required locales.

Please see the demo of how you could use this word pluralization library in browser environment with just vanilla JavaScript.

I hope this small article and the library itself will help you to make word pluralization easy in any JavaScript environment.

If you have any questions — please post them in the comments. I will be glad to help! Cheers!


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commented Feb 3, 2019

numerous.pluralize(locale, calue, variants)
calue instead of value

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