5.0.0 • Public • Published


Extract CLDR data and transform it for use in JavaScript. This a Grunt plugin for the formatjs-extract-cldr-data.

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Getting Started

This plugin requires Grunt.

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:

npm install grunt-extract-cldr-data --save-dev

Once the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:


The "extract_cldr_data" task


In your project's Gruntfile, add a section named extract_cldr_data to the data object passed into grunt.initConfig().

  extract_cldr_data: {
    options: {
      // Task-specific options go here.
    your_target: {
      // Target-specific file lists and/or options go here.


Each target must supply a dest property for the file path where the generated files should be outputted to. If dest is a directory, then a file will be generated per locale. If dest is a .js file, then only one file will be generated and it will contain the data for all options.locales.



Type: Array Default value: All CLDR locales

An array of language tag strings strings for the locales to extract data for; e.g., ['en', 'fr', 'zh-Hant-HK', ...]


Type: Boolean Default value: false

Whether or not the pluralRuleFunction CLDR data should be extracted for each of the given locales.


Type: Boolean Default value: false

Whether or not the relative-time fields CLDR data should be extracted for each of the given locales.


Type: String Default value: ""

A string that will be prepended to each of the generated files. This can be a code comment, or actual JavaScript code.


Type: Function Default value: undefined

A function that will be passed a string of serialized data for each each option.locales. This function must return a string. This is useful for wrapping the locale data with JavaScript code; e.g., assigning it to a var.

Usage Examples

Extract Plural Rule Functions

In this example, the CLDR plural rule functions for all locales will be extracted and output into a single file which wraps each locale's data in a function call:

  extract_cldr_data: {
    all: {
      dest: 'locale-data/locales.js',
      options: {
        pluralRules: true,

        prelude: [
          '// GENERATED FILE',
          'var IntlMessageFormat = require("intl-messageformat");\n\n'

        wrapEntry: function (serialized) {
          return 'IntlMessageFormat.__addLocaleData(' + serialized + ');';

Extract Fields and Plural Rule Functions

In this example, CLDR relative-time fields and plural rule functions for just English and French will be extracted and output into a one file per locale. Both of the locale's data is also wrapped in a function call:

  extract_cldr_data: {
    en_and_fr: {
      dest: 'locale-data/',
      options: {
        locales       : ['en-US', 'fr-FR'],
        pluralRules   : true,
        relativeFields: true,

        wrapEntry: function (serialized) {
          return 'IntlRelativeFormat.__addLocaleData(' + serialized + ');';

Note: The locale-data/ directory will contain two files: en.js, and fr.js. This is because the hierarchy in the language tags is leveraged to de-duplicate data at the language level.


In lieu of a formal style guide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using Grunt.

Release History

  • 1.0.0: Initial release.
  • 1.0.1: Update cldr package to fix issue with plural rule functions.
  • 1.1.0: Update and lock-down cldr package to latest.
  • 2.0.0: Refactored to use formatjs-extract-cldr-data.
  • 2.1.0: Upgrade to formatjs-extract-cldr-data@v1.1.0.
  • 3.0.0: Upgrade to formatjs-extract-cldr-data@v2.0.0.
  • 4.0.0: Upgrade to formatjs-extract-cldr-data@v4.0.0.
  • 4.1.0: Upgrade to formatjs-extract-cldr-data@v4.1.0.


This software is free to use under the Yahoo! Inc. BSD license. See the LICENSE file for license text and copyright information.

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npm i @ember-intl/grunt-extract-cldr-data

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