Intl.getCanonicalLocales()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since October 2017.
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.
Try it
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 (Firefox/Safari): RangeError: invalid language tag: "EN_US"
// Expected output (Chrome): RangeError: Incorrect locale information provided
}
Syntax
js
Intl.getCanonicalLocales(locales)
Parameters
Return value
An array containing the canonical locale names.
Examples
Using getCanonicalLocales
js
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
| Specification |
|---|
| ECMAScript® 2026 Internationalization API Specification # sec-intl.getcanonicallocales |
Browser compatibility
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