Formatting

Principle

Formatting is locale-aware at runtime, not baked into translation strings. Translations contain text; formatting logic lives in code.

Currency

All prices use Intl.NumberFormat with the locale and currency code:

new Intl.NumberFormat('nl-NL', {
  style: 'currency',
  currency: 'EUR',
}).format(29.95);
// → "€ 29,95"

Locale	Example
nl-NL	€ 29,95
de-DE	29,95 €
fr-FR	29,95 €
en	€29.95

Currency codes come from the store configuration, not from translations.

Dates

Use Intl.DateTimeFormat with locale-appropriate patterns:

new Intl.DateTimeFormat('nl-NL', {
  dateStyle: 'long',
}).format(date);
// → "28 februari 2026"

Locale	Long format
nl-NL	28 februari 2026
de-DE	28. Februar 2026
fr-FR	28 février 2026
en	February 28, 2026

Numbers

Use Intl.NumberFormat for decimal and grouping separators:

Locale	1234.5
nl-NL	1.234,5
de-DE	1.234,5
en	1,234.5
fr-FR	1 234,5

What NOT to put in translation strings

• Currency symbols or formatted amounts — use Intl.NumberFormat
• Date formats — use Intl.DateTimeFormat
• Pluralization logic — use Intl.PluralRules or a lightweight plural helper
• Number formatting — use Intl.NumberFormat

Translation strings should only contain text and placeholders:

{
  "cart.total": "Total: {amount}",
  "shipping.estimate": "Estimated delivery: {date}"
}

The {amount} and {date} placeholders receive pre-formatted values from code.