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I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.


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caching layer backend for i18next using browsers localStorage







This is a i18next cache layer to be used in the browser. It will load and cache resources from localStorage and can be used in combination with the chained backend.

Getting started

Source can be loaded via npmor downloaded from this repo.

  • If you don't use a module loader it will be added to window.i18nextLocalStorageBackend
# npm package
$ npm install i18next-localstorage-backend

Wiring up with the chained backend:

import i18next from 'i18next';
import Backend from 'i18next-chained-backend';
import LocalStorageBackend from 'i18next-localstorage-backend'; // primary use cache
import XHR from 'i18next-xhr-backend'; // fallback xhr load

    backend: {
      backends: [
        LocalStorageBackend,  // primary
        XHR                   // fallback
      backendOptions: [{
        /* below options */
      }, {
        loadPath: '/locales/{{lng}}/{{ns}}.json' // xhr load path for my own fallback

Cache Backend Options

  // prefix for stored languages
  prefix: 'i18next_res_',

  // expiration
  expirationTime: 7*24*60*60*1000,

  // language versions
  versions: {},

  // can be either window.localStorage or window.sessionStorage. Default: window.localStorage
  store: window.localStorage
  • Contrary to cookies behavior, the cache will respect updates to expirationTime. If you set 7 days and later update to 10 days, the cache will persist for 10 days

  • Passing in a versions object (ex.: versions: { en: 'v1.2', fr: 'v1.1' }) will give you control over the cache based on translations version. This setting works along expirationTime, so a cached translation will still expire even though the version did not change. You can still set expirationTime far into the future to avoid this

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