Currency Codes Reference

// Format a number as currency
new Intl.NumberFormat('en-US', {
  style: 'currency',
  currency: 'USD',
}).format(1234567.89);
// → "$1,234,567.89"

// German Euro
new Intl.NumberFormat('de-DE', {
  style: 'currency',
  currency: 'EUR',
}).format(1234567.89);
// → "1.234.567,89 €"

// Symbol only (default)
new Intl.NumberFormat('en-US', {
  style: 'currency',
  currency: 'USD',
  currencyDisplay: 'symbol',  // "$"
}).format(99.99);

// ISO code display
new Intl.NumberFormat('en-US', {
  style: 'currency',
  currency: 'JPY',
  currencyDisplay: 'code',  // "JPY 12,346"
}).format(12345.6);

// Narrow symbol (no country prefix)
new Intl.NumberFormat('en-CA', {
  style: 'currency',
  currency: 'CAD',
  currencyDisplay: 'narrowSymbol', // "$"
}).format(50);

// JPY, KRW, VND, CLP have 0 minor units
// Intl handles this automatically
new Intl.NumberFormat('ja-JP', {
  style: 'currency',
  currency: 'JPY',
}).format(1234567);
// → "¥1,234,567"  (no .00)

// Manual check using resolved options
const fmt = new Intl.NumberFormat('en-US', {
  style: 'currency', currency: 'KWD',
});
fmt.resolvedOptions().minimumFractionDigits; // → 3

// Accounting style uses (n) for negatives
new Intl.NumberFormat('en-US', {
  style: 'currency',
  currency: 'USD',
  currencySign: 'accounting',
}).format(-1234.56);
// → "($1,234.56)"

// No grouping (compact)
new Intl.NumberFormat('en-US', {
  style: 'currency',
  currency: 'USD',
  notation: 'compact',
}).format(1500000);
// → "$1.5M"