js locales list

JavaScript Locales List: Internationalize Your Apps Today

By Joshua JonesApril 1, 2026

The concept of locales in JavaScript is pivotal in catering to a global audience, enabling the application of appropriate languages, numbers, and dates for different regions. Understanding the list of locales available is crucial for developers to make the best use of them. In this article, we will explore the JavaScript locales, their types, and usage.

Establishing a localized user interface enhances user experience and can significantly boost user engagement. It shows respect for the user's language and cultural preferences, making the interaction smoother and more meaningful.

Understanding JavaScript Locales

JavaScript locales are defined by the " Protein " (BCP 47) standard, which employs a language tag to identify a locale, combining a primary language subtag with other optional subtags for region, script, and variant. This results in codes like 'en-US', 'zh-CN', or 'fr-FR'.

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Each locale determines the language, how to format dates and numbers, and provides other culturally relevant data.

Locales vs. Time Zones

Before diving into locales, it's essential to differentiate them from time zones. Unlike locales, which influence number and date formatting, time zones only affect time-related processes like adding days or hours to a Date object.

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For instance, in locales, numbers are formatted differently: '1,234' in 'en-US' but '1 234' in 'fr-FR'. However, both locales might use the same date format: 'MM/DD/YYYY'.

Type of Locales

JavaScript supports several types of locales:

Browsers localized in English (Default for most browsers)
Browsers localized in languages other than English
Server provided (using Accept-Language header)

Besides these, you can manually specify a locale to suit your application's needs.

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(h2) Using Locales in JavaScript

The Intl object in ECMAScript provides locale-aware functions for dates and times, numbers, and currencies. To use locales, you need to provide an options object to these methods, informed by your user's preferences.

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Explicitly Setting Locales

You can also set locales explicitly while using these methods:


const date = new Date();
console.log(date.toLocaleString('en-US', {weekday: 'long'}));

In this example, 'en-US' is the locale, and an options object is provided to request long-form weekday names.

(h2) JavaScript Locales List - A Glimpse

JavaScript supports a wide range of locales, with some of the most common being 'en-US', 'es-MX', 'ru-RU', 'zh-CN', 'de-DE', and 'fr'. To find out all the supported locales, you can use:


Object.values(Intl.DateTimeFormat().resolvedOptions().locale); // will provide you with the list of locales

Summing up, the locale concept in JavaScript is profoundly impactful in creating user-intuitive, globally friendly applications. With the right understanding of locales, you can serve the best user experience irrespective of your users' geographic location or language preference. Start exploring the JavaScript locale list today!