Internationalization plug-in, used to solve i18n problem.

How to enable

Configure locale to enable.


Contains the following functions,

Conventional multi-language support

For example, in the following directory, the project has the internationalized language switch between zh-CN and en-US:

+ src
+ locales
+ pages

Naming convention for multi-language files: <lang><separator (configured by baseSeparator)><COUNTRY>.js

The content specification of multilingual files: key-value literal, as follows:

// src/locales/zh-CN.js
export default {
WELCOME_TO_UMI_WORLD: '{name}, welcome to the world of umi',
// src/locales/en-US.js
export default {
WELCOME_TO_UMI_WORLD: "{name}, welcome to umi's world",

If the project is configured with singular: true, locales should be changed to locale

import from umi

@umijs/plugin-locale is based on the react-intl package and supports all its apis. For details, please see here. In order to facilitate the use, we also added some other functions, here will list all the api, and show its functions.


Add languages ​​dynamically. After adding languages, you can get the list through getAllLocales. Three parameters of addLocale.

  • The key of the name language. E.g. zh-TW
  • The id list of message language. For example:{ name:'Hello, {name}',}
  • Corresponding momentLocale and antd configuration
import zhTW from 'antd/es/locale/zh_TW';
// Dynamically add new languages
// id list
name: 'Hello, {name}',
momentLocale: 'zh-tw',
antd: zhTW,


Get a list of all internationalized files currently obtained. By default, it will look for files similar to en-US.(js|json|ts) in the locales folder.

import { getAllLocales } from 'umi';
console.log(getAllLocales()); // [en-US,zh-CN,...]


getLocale will get the currently selected language.

import { getLocale } from 'umi';
console.log(getLocale()); // en-US | zh-CN


UseIntl is the most commonly used api, and it can obtain apis such as formatMessage for specific value binding.

// en-US.json
export default {
name: 'Hi, {name}',
import React, { useState } from 'react';
import { useIntl } from 'umi';
export default function () {
const intl = useIntl();
return (
<button type="primary">
id: 'name',
defaultMessage: 'Hello, traveler',
name: 'Traveler',


Set the switching language, the page will be refreshed by default. You can achieve dynamic switching without refresh by setting the second parameter to false.

import { setLocale } from 'umi';
// refresh page
setLocale('zh-TW', true);
// Do not refresh the page
setLocale('zh-TW', false);



  • Type: object

Directory convention:

Build-time configuration

After enabling locale: {}, the default configuration is as follows:

export default {
locale: {
default: 'zh-CN',
antd: false,
title: false,
baseNavigator: true,
baseSeparator: '-',


  • Type: string
  • Default: -

The separator between country (lang) and language (language).

By default, it is -, and the returned language and catalog files are zh-CN, en-US,sk, etc.


  • Type: string -Default: zh-CN

Default language, when no specific language is detected, the language specified in default is displayed.

If baseNavigator is specified as _, default defaults to zh_CN.


  • Type: boolean
  • Default: false

After opening, support antd internationalization.


  • Type: boolean
  • Default: false

Title internationalization.

The title configured in the project and the title in the route can directly use the internationalization key and automatically be converted into the corresponding language copy, for example:

Under the locales directory:

// src/locales/zh-CN.js
export default {
'site.title': 'Site-Title',
'about.title': 'About-Title',
// src/locales/en-US.js
export default {
'site.title': 'English Title',
'about.title': 'About-Title',

The project configuration is as follows:

// .umirc.js
export default {
title: 'site.title',
routes: [
path: '/',
component: 'Index',
path: '/about',
component: 'About',
title: 'about.title',

When visiting the page:

  • / route, title is site-title in Chinese, English Title in English
  • /about route, the title is About-Title in Chinese, and About Title in English


  • Type: boolean
  • Default: true

Turn on browser language detection.

By default, the current locale is recognized as follows: umi_localevalue inlocalStorage> browser detection> default language set by default> Chinese

Runtime configuration

Support some extensions and customizations to internationalization at runtime, such as custom language recognition.


Customize language acquisition logic, such as identifying the link ?locale=${lang} as the language of the current page.

// src/app.js
import qs from 'qs';
export const locale = {
getLocale() {
const { search } = window.location;
const { locale = 'zh-CN' } = qs.parse(search, { ignoreQueryPrefix: true });
return locale;


Custom language switching logic. There are three parameters:

  • lang: The language to be switched
  • realReload: Whether the page needs to be refreshed, this is transparently transmitted by the page calling setLocale(lang, true).
  • updater: Whether it is necessary to forcibly update the internationalization status of the current component.

For example, according to the language to be switched, jump to the corresponding url:

// src/app.js
export const locale = {
setLocale({ lang, realReload, updater }) {


Why not just use formatMessage as a syntactic sugar?

Although formatMessage is very convenient to use, it is out of the life cycle of react. The most serious problem is that it cannot trigger dom to re-render when switching languages. In order to solve this problem, we refresh the browser when switching languages. The user experience is very poor, so we recommend you to use useIntl or injectIntl, can achieve the same function.