The Intl.NumberFormat.prototype.format property returns a getter function that formats a number according to the locale and formatting options of this NumberFormat object.

Syntax

numberFormat.format(number)

Parameters

number
The number to format.

Description

The function returned by the format getter formats a number into a string according to the locale and formatting options of this NumberFormat object.

Examples

Using format

Use the function returned by the format getter for formatting a single currency value, here for Russia:

var options = { style: 'currency', currency: 'RUB' };
var numberFormat = new Intl.NumberFormat('ru-RU', options);
console.log(numberFormat.format(654321.987));
// → "654 321,99 руб."

Using format with map

Use the function returned by the format getter for formatting all numbers in an array. Note that the function is bound to the NumberFormat from which it was obtained, so it can be passed directly to Array.prototype.map.

var a = [123456.789, 987654.321, 456789.123];
var numberFormat = new Intl.NumberFormat('es-ES');
var formatted = a.map(numberFormat.format);
console.log(formatted.join('; '));
// → "123.456,789; 987.654,321; 456.789,123"

Specifications

Specification Status Comment
ECMAScript Internationalization API 1.0 (ECMA-402)
The definition of 'Intl.NumberFormat.prototype.format' in that specification.
Standard Initial definition.
ECMAScript Internationalization API 2.0 (ECMA-402)
The definition of 'Intl.NumberFormat.prototype.format' in that specification.
Standard  
ECMAScript Internationalization API 4.0 (ECMA-402)
The definition of 'Intl.NumberFormat.prototype.format' in that specification.
Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
Basic supportChrome Full support 24Edge Full support YesFirefox Full support 29IE Full support 11Opera Full support 15Safari Full support 10WebView Android No support NoChrome Android Full support 26Edge Mobile Full support YesFirefox Android Full support 56Opera Android ? Safari iOS Full support 10Samsung Internet Android Full support Yesnodejs ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

Document Tags and Contributors

Contributors to this page: wbamberg, fscholz, arai, abroz, Mingun, Sheppy, Norbert
Last updated by: wbamberg,