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redux-intl-connect is a redux connect agnostic binding for internationalizing your application, with support for ICU MessageFormat.

This library does not depend on polyfills and/or the ECMAScript Internationalization API. It provides a single method: formatMessage with it's API inspired by the FormatJS counterpart.


FormatJS and it's corresponding bindings for React, Ember, Angular for Redux are great. However, 2 use cases in some of my projects led to this:

  1. Location with older browsers meant the need for polyfills due to the absence of ECMAScript Internationalization API. However, these places are also highly likely to have slower internet speeds. As such a relatively large dependency download which is not ideal.
  2. Only functionality provided by formatMessage is required.



MessageFormat Syntax

For example:

// Messages in the reducer: 
    someKey: 'You {NUM_ADDS, plural, offset:1' +
        '=0{did not add this}' +
        '=1{added this}' +
        'one{and one other person added this}' +
        'other{and # others added this}' +
    otherKey: '{GENDER, select, male{He} female{She} other{They}} liked this.'
// In your files: 
formatMessage({id: 'someKey'}, {NUM_ADDS: 2}); // "You and one other person added this." 
formatMessage({id: 'otherKey'}, {GENDER: 'male'}); // "He liked this." 

Optional ECMA Intl Support

While it is not the goal of this project, as stated above (in Motivation #1), the messageformat package which was introduced as the dependent library in v2, has optional support for browser ECMAScript Intl or via it's polyfills.

As such, you can optionally turn on Intl API support by dispatching or setting ecmaSupport value in the reducer to true. You'll need the corresponding polyfill if you want cross browser version support.

For more information about the extended support, check out the messageformat documentation

store.dispatch(updateIntl({ecmaSupport: true}));


Install the library:

npm install redux-intl-connect redux --save

Install a corresponding redux connect library. Examples:

npm install react-redux
npm install preact-redux
npm install ng-redux


Using react-redux as an example:

// intlConnect.js 
import {connect} from 'react-redux';
import {connectIntl} from 'redux-intl-connect';
export default connectIntl(connect);
// intlInject.js 
import {connect} from 'react-redux';
import {injectIntl} from 'redux-intl-connect';
export default injectIntl(connect);

In your components

// Example Component 
const Component = (props) => {
    return <div>{props.intl.formatMessage({id: 'translation_id'})}</div>
// Using intlConnect defined above 
import connect from './intlConnect';
export default connect(mapStateToProps, mapDispatchToProps)(Component);
// Using intlInject defined above 
import connect from 'react-redux';
import intlInject from './intlInject';
export default connect(mapStateToProps, mapDispatchToProps)(intlInject(Component));

Available Methods

Provide locale and messages onload

You should provide a default locale and messages when the store is initially loaded.

const initialState = {
  intl: {
    locale: 'it',
    messages: {
      'greeting': 'Ciao!',
  // ...other initialState 
const store = createStore(reducer, initialState);

Switching locale and messages on demand

You could switch locale on user's request by dispatching updateIntl action.

import {updateIntl} from 'redux-intl-connect';

In a "real-world" scenario, an action will be dispatched to fetch translations from a server before updateIntl is being called. A possible example with redux-thunk would be:

import {updateIntl} from 'redux-intl-connect';
const getAndUpdateIntl = (locale) => (dispatch) => {
    .then(function(response) {
       return response.text()
    .then((body) => {
          messages: body


redux-intl-connect is BSD licensed

See also


Highly influenced by the following libraries:

ICU Message Syntax parsing is done via messageformat package.