A TypeScript library for formatting strings during input and presentation, following ISO standards. Tidily provides robust handling for various data types including dates, numbers, phone numbers, credit cards, and more.

• 🎯 Type-safe formatting with TypeScript
• 🔄 Real-time input formatting
• 📅 Date formatting (DMY, MDY, YMD)
• 💳 Credit card number formatting
• 📞 Phone number formatting
• 💰 Price and currency formatting
• 📧 Email validation and formatting
• 🔢 Number formatting (integers, decimals, percentages)
• ⚡️ Zero dependencies (except isoly)
• 📦 Works in both ESM and CommonJS environments

npm install tidily

import { tidily } from "tidily"

// Format a credit card number during input
const formatted = tidily.format("4111111111111111", "card-number")
console.log(formatted) // "4111 1111 1111 1111"

// Format a date
const date = tidily.format("20250528", "date")
console.log(date) // "2025-05-28"

• card-csc - Card security code
• card-expires - Card expiration date
• card-number - Card number with spaces
• date - Date formatting (DMY/MDY/YMD)
• date-time - DateTime formatting
• divisor - Number divisor formatting
• duration - Time duration
• email - Email address
• hex-color - Hexadecimal color codes
• identifier - Custom identifiers
• identity-number - Identity numbers
• integer - Integer numbers
• password - Password input
• percent - Percentage values
• phone - Phone numbers
• postal-code - Postal/ZIP codes
• price - Price/currency values
• text - General text formatting

Formats a string value according to the specified type and optional settings.

Parses a formatted string back into its raw value.

Each formatter type can accept specific settings. For example:

// Format a price with specific currency and locale
const price = tidily.format("1234.56", "price", {
	currency: "USD",
	locale: "en-US",
})
console.log(price) // "$1,234.56"

1. Clone the repository
2. Install dependencies: npm install
3. Build: npm run build
4. Test: npm test
5. Lint: npm run lint

See CONTRIBUTING.md for detailed development guidelines.

MIT © Utily Contributors