A minimalist library that converts numbers to their word representation in various languages. Zero dependencies, tree-shakeable, and type-safe.

Table of Contents

• Installation
• Features
• Usage
  • Basic Usage
  • Localization

Installation

npm install @matsukky/number
# or
yarn add @matsukky/number
# or
bun add @matsukky/number

Features

• 🪶 Lightweight
• 📦 Zero dependencies
• 🌍 Support for multiple languages
• 🔠 Automatic capitalization
• 💪 Fully typed (TypeScript)

Usage

Basic Usage

import convertNumberToWords from '@matsukky/number';

console.log(convertNumberToWords(42));    // "forty-two"
console.log(convertNumberToWords(100));   // "one hundred"
console.log(convertNumberToWords(1337));  // "one thousand three hundred thirty-seven"
console.log(convertNumberToWords(-42));   // "minus forty-two"

Localization

import { locale, convertNumberToWords } from '@matsukky/number';

// Load French locale
await locale('fr', true); // if the languages 

console.log(convertNumberToWords(42));    // "quarante-deux"
console.log(convertNumberToWords(100));   // "cent"


// OR
import { locale, convertNumberToWords } from '@matsukky/number';
import '@matsukky/number/locale/es'

locale('es')

console.log(convertNumberToWords(42));    // "cuarenta-dos"
console.log(convertNumberToWords(100));   // "cien"

Custom Language

You can use your own language by using the code custom.

import { locale, convertNumberToWords, Types } from '@matsukky/number';

const CustomLang = {
  code: 'custom',
  ones: ["", "uno", "dyo", "tri", "quatro", "penta", "hexa", "septa", "okto", "nova"],
  teens: ["dizan", "dizan-uno", "dizan-dyo", "dizan-tri", "dizan-quatro", "dizan-penta", "dizan-hexa", "dizan-septa", "dizan-okto", "dizan-nova"],
  tens: ["", "", "dizo", "trizo", "quarzo", "pentzo", "hexzo", "septzo", "okzo", "novzo"],
  thousands: ["", "kilo", "mega", "giga"],
  hundred: "hundo",
  zero: "nullo",
  minus: "meno",
} as Types.LanguageData;

locale(CustomLang, true)

console.log(convertNumberToWords(42));    // "quarzo-dyo"
console.log(convertNumberToWords(100));   // "hundo"

API Reference

convertNumberToWords(number, options)

convertNumberToWords(
  num: number, 
  options?: {
    capitalize?: boolean;
    language?: AvalaibleLanguage;
  }
): string

LoadedLanguages()

LoadedLanguages(): string[]

locale(language, dynamicImport?)

locale(
  language: AvalaibleLanguage | LanguageData, 
  dynamicImport?: boolean
): Promise<void>

Supported Languages

• English (en)
• French (fr)
• Belgian French (fr-BE)
• Spanish (es)
• Italian (it)
• German (de)
• Japanese (ja)
• Chinese (zh)
• Arabic (ar)
• Russian (ru)

Each language implementation includes:

• Basic numbers (0-9)
• Teens (11-19)
• Tens (20, 30, etc.)
• Hundreds
• Powers of thousands (thousand, million, billion, etc.)
• Negative numbers support