The Intl.Locale object is a standard built-in property of the Intl object that represents a Unicode locale identifier.


The Intl.Locale object was created to allow for easier manipulation of Unicode locales. Unicode represents locales with a string, called a locale identifier. The locale identifier consists of a language identifier and extension tags. Language identifiers are the core of the locale, consisting of language, script, and region subtags. Additional information about the locale is stored in the optional extension tags. Extension tags hold information about locale aspects such as calendar type, clock type, and numbering system type.

Traditionally, the Intl API used strings to represent locales, just as Unicode does. This is a simple and lightweight solution that works well. Adding a Locale class, however, adds ease of parsing and manipulating the language, script, and region, as well as extension tags.



Creates a new Locale object.

Instance properties


Returns basic, core information about the Locale in the form of a substring of the complete data string.


Returns the part of the Locale that indicates the Locale's calendar era.


Returns whether case is taken into account for the locale's collation rules.


Returns the collation type for the Locale, which is used to order strings according to the locale's rules.


Returns the time keeping format convention used by the locale.


Returns the language associated with the locale.


Returns the numeral system used by the locale.


Returns whether the locale has special collation handling for numeric characters.


Returns the region of the world (usually a country) associated with the locale.


Returns the script used for writing the particular language used in the locale.

Instance methods


Gets the most likely values for the language, script, and region of the locale based on existing values.


Attempts to remove information about the locale that would be added by calling Locale.maximize().


Returns the Locale's full locale identifier string.


Basic usage

At its very simplest, the Intl.Locale constructor takes a locale identifier string as its argument:

let us = new Intl.Locale('en-US');

Using the Locale constructor with an options object

The constructor also takes an optional configuration object argument, which can contain any of several extension types. For example, set the hourCycle property of the configuration object to your desired hour cycle type, and then pass it into the constructor:

let us12hour = new Intl.Locale("en-US", {hourCycle: "h12"});
console.log(us12hour.hourCycle); // Prints "h12"


ECMAScript Internationalization API Specification (ECMAScript Internationalization API)
# locale-objects

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See also