Formatting Utilities

Formatting utilities use the native Intl API for locale-aware formatting of dates, numbers, and currencies.

Currency

import { formatCurrency } from '@/lib/utils';

formatCurrency(1234.56);           // "$1,234.56"
formatCurrency(1234.56, 'EUR');    // "€1,234.56"
formatCurrency(1234.56, 'JPY', 'ja-JP');  // "¥1,235"

Numbers

import { formatNumber } from '@/lib/utils';

formatNumber(1234567);         // "1,234,567"
formatNumber(1234567, 'de-DE'); // "1.234.567"

Dates

import { formatDate } from '@/lib/utils';

formatDate(new Date());
// "December 11, 2025"

formatDate(new Date(), { 
  year: 'numeric', 
  month: 'short', 
  day: 'numeric' 
});
// "Dec 11, 2025"

formatDate('2025-01-15', { 
  weekday: 'long', 
  year: 'numeric', 
  month: 'long', 
  day: 'numeric' 
});
// "Wednesday, January 15, 2025"

Relative Time

import { formatRelativeTime } from '@/lib/utils';

formatRelativeTime(Date.now() - 3600000);  // "1 hour ago"
formatRelativeTime(Date.now() + 86400000); // "tomorrow"
formatRelativeTime(Date.now() - 60000);    // "1 minute ago"

Strings

import { truncate, capitalize, slugify } from '@/lib/utils';

truncate('Long text here', 10);  // "Long text..."
capitalize('hello');              // "Hello"
slugify('Hello World!');          // "hello-world"

API Reference

Function	Parameters	Returns
formatCurrency	amount, currency?, locale?	string
formatNumber	value, locale?	string
formatDate	date, options?, locale?	string
formatRelativeTime	date, locale?	string
truncate	str, length	string
capitalize	str	string
slugify	str	string