Intl.Locale.prototype.baseName

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2020.

The baseName accessor property of Intl.Locale instances returns a substring of this locale's string representation, containing core information about this locale, including the language, and the script and region if available.

Description

baseName returns the language ["-" script] ["-" region] *("-" variant) subsequence of the unicode_language_id grammar. It only includes information explicitly specified in the constructor, either through the locale identifier string or the options object.

The set accessor of baseName is undefined. You cannot change this property directly.

Examples

Basic Example

js
const myLoc = new Intl.Locale("fr-Latn-CA"); // Sets locale to Canadian French
console.log(myLoc.toString()); // Prints out "fr-Latn-CA-u-ca-gregory"
console.log(myLoc.baseName); // Prints out "fr-Latn-CA"

Example with options in the input string

js
// Sets language to Japanese, region to Japan,

// calendar to Gregorian, hour cycle to 24 hours
const japan = new Intl.Locale("ja-JP-u-ca-gregory-hc-24");
console.log(japan.toString()); // Prints out "ja-JP-u-ca-gregory-hc-h24"
console.log(japan.baseName); // Prints out "ja-JP"

Example with options that override input string

js
// Input string indicates language as Dutch and region as Belgium,

// but options object overrides the region and sets it to the Netherlands
const dutch = new Intl.Locale("nl-Latn-BE", { region: "NL" });

console.log(dutch.baseName); // Prints out "nl-Latn-NL"

Specifications

Specification
ECMAScript® 2025 Internationalization API Specification
# sec-Intl.Locale.prototype.baseName

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
baseName

Legend

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Full support
Full support

See also