Node Express server with i18next. Language files go in a `locales/` directory.

en.json

{
  "home": {
    "title": "Hello World!"
  }
}

es.json

{
  "home": {
    "title": "Hola Mundo!"
  }
}

index.js

'use strict';

const express = require('express');
const fs = require('fs');
const i18n = require('i18next');
const i18nFsBackend = require('i18next-node-fs-backend');
const i18nMiddleware = require('i18next-express-middleware');

const app = express();
const port = process.env.PORT || 8080;

i18n
  .use(i18nFsBackend)
  .use(i18nMiddleware.LanguageDetector)
  .init({
    backend: {
      loadPath: __dirname + '/locales/{{lng}}.json',
      addPath: __dirname + '/locales/{{lng}}.missing.json'
    },
    fallbackLng: 'en',
    lowerCaseLng: true,
    preload: ['en', 'es'],
    saveMissing: true
  });

app.use(i18nMiddleware.handle(i18n, {
  removeLngFromUrl: false
}));

app.get('/', (req, res) => {
  res.send(req.t('home.title'));
});

module.exports = app.listen(port, (err) => {
  if (err) {
    console.log(err);
    process.exit(1);
  } else {
    console.log(`Server is listening on port ${port}`);
  }
});

package.json

{
  "name": "i18n-server",
  "version": "1.0.0",
  "description": "Node Express server with i18next.",
  "main": "index.js",
  "scripts": {
    "start": "node index.js"
  },
  "author": "Shaun Scovil <sscovil@gmail.com>",
  "license": "ISC",
  "dependencies": {
    "express": "4.15.2",
    "i18next": "8.2.1",
    "i18next-express-middleware": "1.0.5",
    "i18next-node-fs-backend": "1.0.0"
  }
}

Thx bro :)

Was better if you add complete example.