Presenting numbers in a readable format takes many forms, from visual charts to simply adding punctuation. Those punctuation, however, are different based on internationalization. Some countries use , for decimal, while others use .. Worried about having to code for all this madness? Don’t — JavaScript provides a method do the hard work for you!

The Number primitive has a toLocaleString method to do the basic formatting for you:

const price = 16601.91;  // Basic decimal format, no providing locale // Uses locale provided by browser since none defined price.toLocaleString(); // "16,601.91"  // Provide a specific locale price.toLocaleString('de-DE'); // "16.601,91"  // Formatting currency is possible price.toLocaleString('de-DE', {    style: 'currency',    currency: 'EUR'  }); // "16.601,91 €"  // You can also use Intl.NumberFormat for formatting new Intl.NumberFormat('en-US', {   style: 'currency',   currency: 'GBP' }).format(price); // £16,601.91 

It’s a major relief that JavaScript provides us these type of helpers so that we don’t need to rely on bloated third-party libraries. No excuses — the tool is there!

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