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    1.1.4 • Public • Published


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    This is an i18next backend to be used in Node.js and Deno. It will load resources from the file system.

    It's based on the deprecated i18next-node-fs-backend and can mostly be used as a drop-in replacement.

    It will load resources from filesystem. Right now it supports following filetypes:

    • .json
    • .json5
    • .yml/.yaml

    Getting started

    # npm package
    $ npm install i18next-fs-backend

    Wiring up:

    import i18next from 'i18next';
    import Backend from 'i18next-fs-backend';

    for Deno:

    import i18next from 'https://deno.land/x/i18next/index.js'
    import Backend from 'https://deno.land/x/i18next_fs_backend/index.js'
    • As with all modules you can either pass the constructor function (class) to the i18next.use or a concrete instance.

    Backend Options

      // path where resources get loaded from, or a function
      // returning a path:
      // function(lngs, namespaces) { return customPath; }
      // the returned path will interpolate lng, ns if provided like giving a static path
      loadPath: '/locales/{{lng}}/{{ns}}.json',
      // path to post missing resources
      addPath: '/locales/{{lng}}/{{ns}}.missing.json',
      // if you use i18next-fs-backend as caching layer in combination with i18next-chained-backend, you can optionally set an expiration time
      // an example on how to use it as cache layer can be found here: https://github.com/i18next/i18next-fs-backend/blob/master/example/caching/app.js
      // expirationTime: 60 * 60 * 1000

    Options can be passed in:

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

    import i18next from 'i18next';
    import Backend from 'i18next-fs-backend';
      backend: options,

    on construction:

    import Backend from 'i18next-fs-backend';
    const Backend = new Backend(null, options);

    via calling init:

    import Backend from 'i18next-fs-backend';
    const Backend = new Backend();
    Backend.init(null, options);

    If set i18next initImmediate option to false it will load the files synchronously

    // i18n.js
    const { join } = require('path')
    const { readdirSync, lstatSync } = require('fs')
    const i18next = require('i18next')
    const Backend = require('i18next-fs-backend')
        // debug: true,
        initImmediate: false,
        fallbackLng: 'en',
        lng: 'en',
        preload: readdirSync(join(__dirname, '../locales')).filter((fileName) => {
          const joinedPath = join(join(__dirname, '../locales'), fileName)
          const isDirectory = lstatSync(joinedPath).isDirectory()
          return isDirectory
        ns: 'backend-app',
        defaultNS: 'backend-app',
        backend: {
          loadPath: join(__dirname, '../locales/{{lng}}/{{ns}}.json')

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