Formatting numbers as currency is essential for e-commerce applications, financial displays, pricing components, and implementing features like shopping carts or payment interfaces in JavaScript applications. With over 25 years of experience in software development and as the creator of CoreUI, I’ve implemented currency formatting extensively in components like price displays, checkout forms, and financial dashboards where proper monetary representation is crucial for user trust and international compatibility. From my extensive expertise, the most robust and internationalization-friendly approach is using Intl.NumberFormat with currency options. This method handles locale-specific formatting, currency symbols, and decimal precision automatically while supporting multiple currencies and regions.