I18N Standards & Code Snippets

// Get browser language
const userLanguage = navigator.language || navigator.userLanguage;
console.log(userLanguage); // e.g., "en-US"

// Get language without region code
const baseLanguage = userLanguage.split('-')[0];
console.log(baseLanguage); // e.g., "en"

// Format number according to locale
const number = 1234567.89;
console.log(number.toLocaleString('de-DE')); // 1.234.567,89
console.log(number.toLocaleString('en-US')); // 1,234,567.89

// Format currency
const amount = 123.45;
console.log(amount.toLocaleString('de-DE', { style: 'currency', currency: 'EUR' })); // 123,45 €
console.log(amount.toLocaleString('en-US', { style: 'currency', currency: 'USD' })); // $123.45

// Format date
const date = new Date();
console.log(date.toLocaleDateString('de-DE')); // 31.12.2023
console.log(date.toLocaleDateString('en-US')); // 12/31/2023