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backend layer for i18next using locize service




Travis npm version Bower David

This is an i18next backend to be used for locize service. It will load resources from locize server using xhr.

It will allow you to save missing keys containing both default value and context information by calling:

i18next.t(key, defaultValue, tDescription);
i18next.t(key, { defaultValue, tDescription });


SaveMissing is not working

Per default only localhost is allowed to send them (to avoid you're using this feature accidentally in production. If you're not using localhost during development you will have to set the allowedAddOrUpdateHosts: ['localhost'] for the backend options.

Getting started

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

# npm package
$ npm install i18next-locize-backend

# bower
$ bower install i18next-locize-backend

Wiring up:

import i18next from "i18next";
import Locize from "i18next-locize-backend";

  • As with all modules you can either pass the constructor function (class) to the i18next.use or a concrete instance.
  • If you don't use a module loader it will be added to window.i18nextLocizeBackend

Backend Options

IMPORTANT make sure you do not add your apiKey in the production build to avoid misuse by strangers

  // the id of your locize project
  projectId: '[PROJECTID]',

  // add an api key if you want to send missing keys
  apiKey: '[APIKEY]',

  // the reference language of your project
  referenceLng: '[LNG]',

  // version - defaults to latest
  version: '[VERSION]',

  // private - set to true if you version on locize is set to use private publish
  private: false,

  // hostnames that are allowed to create, update keys
  // please keep those to your local system, staging, test servers (not production)
  // can be array of allowed hosts or a function (hostname) => { return true; // or false if not allowed }
  allowedAddOrUpdateHosts: ['localhost'],

  // optional event triggered on saved to backend
  onSaved: (lng, ns) => { ... }

To load translations only projectId needs to be filled. To use the saveMissing feature of i18next additional to the projectId both apiKey and referenceLng have to be set.

Options can be passed in:

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

import i18next from "i18next";
import Locize from "i18next-locize-backend";

  backend: options

on construction:

import Locize from "i18next-locize-backend";
const locize = new Locize(options);

via calling init:

import Locize from "i18next-locize-backend";
const locize = new Locize();

Additional API endpoints


Will return a list of all languages in your project including percentage of translations done per version.

import Locize from "i18next-locize-backend";
const locize = new Locize(options);

locize.getLanguages((err, data) => {
  data is:

    "en": {
      "name": "English",
      "nativeName": "English",
      "isReferenceLanguage": true,
      "translated": {
        "latest": 1
    "de": {
      "name": "German",
      "nativeName": "Deutsch",
      "isReferenceLanguage": false,
      "translated": {
        "latest": 0.9

// or;


Will return an object containing useful informations for the i18next init options.

import Locize from "i18next-locize-backend";
const locize = new Locize(options);

locize.getOptions((err, data) => {
  data is:

    fallbackLng: 'en',
    referenceLng: 'en',
    whitelist: ['en', 'de'],
    load: 'languageOnly|all' // depending on your whitelist has locals having region like en-US

// or;

You can set a threshold for languages to be added to whitelist by setting whitelistThreshold in backend options (eg: 1 = 100% translated, 0.9 = 90% translated).

SPECIAL - let the backend determine some options to improve loading

You can load some information from the backend to eg. set whitelist for i18next just supporting languages you got in your locize project.

You will get i18next options for (same as above backend.getOptions):

  • fallbackLng
  • whitelist
  • load
import i18next from "i18next";
import Locize from "i18next-locize-backend";

const locize = new Locize(
    projectId: "[PROJECTID]",
    apiKey: "[APIKEY]",
    version: "[VERSION]"
    // referenceLng -> not needed as will be loaded from API
  (err, opts) => {
    i18next.use(locize).init({ ...opts, ...yourOptions }); // yourOptions should not include backendOptions!