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language detector used in browser environment for i18next





npm version Bower David

This is a i18next language detection plugin use to detect user language in the browser with support for:

Getting started

Source can be loaded via npm, bower or downloaded from this repo.

# npm package
$ npm install i18next-browser-languagedetector

# bower
$ bower install i18next-browser-languagedetector
  • If you don't use a module loader it will be added to window.i18nextBrowserLanguageDetector

Wiring up:

import i18next from 'i18next';
import LanguageDetector from 'i18next-browser-languagedetector';


As with all modules you can either pass the constructor function (class) to the i18next.use or a concrete instance.

Detector Options

  // order and from where user language should be detected
  order: ['querystring', 'cookie', 'localStorage', 'navigator', 'htmlTag', 'path', 'subdomain'],

  // keys or params to lookup language from
  lookupQuerystring: 'lng',
  lookupCookie: 'i18next',
  lookupLocalStorage: 'i18nextLng',
  lookupFromPathIndex: 0,
  lookupFromSubdomainIndex: 0,

  // cache user language on
  caches: ['localStorage', 'cookie'],
  excludeCacheFor: ['cimode'], // languages to not persist (cookie, localStorage)

  // optional expire and domain for set cookie
  cookieMinutes: 10,
  cookieDomain: 'myDomain',

  // optional htmlTag with lang attribute, the default is:
  htmlTag: document.documentElement,

  // only detect languages that are in the whitelist
  checkWhitelist: true

Options can be passed in:

preferred - by setting options.detection in i18next.init:

import i18next from 'i18next';
import LanguageDetector from 'i18next-browser-languagedetector';

    detection: options

on construction:

  import LanguageDetector from 'i18next-browser-languagedetector';
  const languageDetector = new LanguageDetector(null, options);

via calling init:

  import LanguageDetector from 'i18next-browser-languagedetector';
  const languageDetector = new LanguageDetector();

Adding own detection functionality


export default {
  name: 'myDetectorsName',

  lookup(options) {
    // options -> are passed in options
    return 'en';

  cacheUserLanguage(lng, options) {
    // options -> are passed in options
    // lng -> current language, will be called after init and on changeLanguage

    // store it

adding it

  import LanguageDetector from 'i18next-browser-languagedetector';
  const languageDetector = new LanguageDetector();

      detection: options

Don't forget: You have to add the name of your detector (myDetectorsName in this case) to the order array in your options object. Without that, your detector won't be used. See the Detector Options section for more.

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