Web/JavaScript/Reference/Global objects/Intl/NumberFormat/format

From Get docs


The Intl.NumberFormat.prototype.format() method formats a number according to the locale and formatting options of this NumberFormat object.


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Syntax

numberFormat.format(number)

Parameters

number
A Number or BigInt to format.

Description

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

Examples

Using format

Use the format getter function 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 format getter function 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. This is considered a historical artefact, as part of a convention which is no longer followed for new features, but is preserved to maintain compatibility with existing programs. 

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

Specifications

Specification
ECMAScript Internationalization API (ECMA-402)The definition of 'Intl.NumberFormat.prototype.format' in that specification.

Browser compatibility

Update compatibility data on GitHub

Desktop Mobile Server
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet Node.js
format Chrome

Full support 24

Edge Full support 12

Notes'

Full support 12

Notes'

Notes' Before Edge 18, numbers are rounded to 15 decimal digits. For example, new Intl.NumberFormat('en-US').format(1000000000000005) returns "1,000,000,000,000,010".

Firefox

Full support 29

IE Full support 11

Notes'

Full support 11

Notes'

Notes' In Internet Explorer 11, numbers are rounded to 15 decimal digits. For example, new Intl.NumberFormat('en-US').format(1000000000000005) returns "1,000,000,000,000,010".

Opera

Full support 15

Safari

Full support 10

WebView Android

Full support 4.4

Chrome Android

Full support 25

Firefox Android

Full support 56

Opera Android

Full support 14

Safari iOS

Full support 10

Samsung Internet Android

Full support 1.5

nodejs Full support 0.12

Notes'

Full support 0.12

Notes'

Notes' Before version 13.0.0, only the locale data for en-US is available by default. See the NumberFormat() constructor for more details.

Legend

Full support  
Full support
See implementation notes.'
See implementation notes.


See also

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