index.md

title	Intl.getCanonicalLocales()
short-title	getCanonicalLocales()
slug	Web/JavaScript/Reference/Global_Objects/Intl/getCanonicalLocales
page-type	javascript-static-method
browser-compat	javascript.builtins.Intl.getCanonicalLocales
sidebar	jsref

The Intl.getCanonicalLocales() static method returns an array containing the canonical locale names. Duplicates will be omitted and elements will be validated as structurally valid language tags.

{{InteractiveExample("JavaScript Demo: Intl.getCanonicalLocales()")}}

console.log(Intl.getCanonicalLocales("EN-US"));
// Expected output: Array ["en-US"]

console.log(Intl.getCanonicalLocales(["EN-US", "Fr"]));
// Expected output: Array ["en-US", "fr"]

try {
  Intl.getCanonicalLocales("EN_US");
} catch (err) {
  console.log(err.toString());
  // Expected output: RangeError: invalid language tag: "EN_US"
}

Syntax

Intl.getCanonicalLocales(locales)

Parameters

• locales
  • : A list of {{jsxref("String")}} values for which to get the canonical locale names.

Return value

An array containing the canonical locale names.

Examples

Using getCanonicalLocales

Intl.getCanonicalLocales("EN-US"); // ["en-US"]
Intl.getCanonicalLocales(["EN-US", "Fr"]); // ["en-US", "fr"]

Intl.getCanonicalLocales("EN_US");
// RangeError:'EN_US' is not a structurally valid language tag

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• Polyfill of Intl.getCanonicalLocales in FormatJS
• {{jsxref("Intl/NumberFormat/supportedLocalesOf", "Intl.NumberFormat.supportedLocalesOf()")}}
• {{jsxref("Intl/DateTimeFormat/supportedLocalesOf", "Intl.DateTimeFormat.supportedLocalesOf()")}}
• {{jsxref("Intl/Collator/supportedLocalesOf", "Intl.Collator.supportedLocalesOf()")}}