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April 25, 2026 · 4 min read · javascript marketing Web Development

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Hey everyone,
You have a number. You want to format it as currency, or with thousand separators, or in a different language’s format.
Most devs write their own function for this. You don’t have to.

The Code: Intl.NumberFormat

javascript 
const price = 1234567.89;

new Intl.NumberFormat("en-US", {
  style: "currency",
  currency: "USD",
}).format(price);

// "$1,234,567.89"

Works with any locale, any currency. No library. No regex. Built right in.

javascript 
// Euros in German format
new Intl.NumberFormat("de-DE", {
  style: "currency",
  currency: "EUR",
}).format(price);

// "1.234.567,89 €"

Why this is a win:

  • 100% browser support. Works in every major browser and Node.js. No polyfill needed.
  • Handles the hard stuff for you. Commas, periods, currency symbols, decimal places. All formatted correctly for the target locale automatically.
  • Works for non-currency numbers too. Percentages, compact notation (“1.2M”), units. It does all of it.
javascript 
new Intl.NumberFormat("en-US", {
  notation: "compact",
}).format(1234567);

// "1.2M"

One thing to keep in mind:
Create the formatter once and reuse it – new Intl.NumberFormat() has a small setup cost. If you’re formatting many numbers, store the instance in a variable and call .format() on it repeatedly.

Happy coding!
Marko