Am I looking for help about i118 express node.js? - node.js

Question

When i choose some language, i get error message . that err msg is .translation is not defined.
example :
http://localhost:5000/?clang=en
Can I achieve my goal with just these 23 files or do I have to use other methods as well?
my app.js code is
// Imports
const express = require('express')
const expressLayouts = require('express-ejs-layouts')
const app = express()
const port = 5000
// import Router file
var session = require('express-session');
var path = require('path');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var i18n=require("i18n-express"); // <-- require the module
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(session({
secret: 'secret',
saveUninitialized: true,
resave: true
}));
app.use(i18n({
translationsPath: path.join(__dirname, 'i18n'), // <--- use here. Specify translations files path.
siteLangs: ["es", "en", "de", "ru", "it"],
textsVarName: 'translation'
}));
// Static Files
app.use(express.static('public'))
app.use('/css', express.static(__dirname + 'public/css'))
app.use('/images', express.static(__dirname + 'public/images'))
// Set Templating Engine
app.use(expressLayouts)
app.set('layout', './layouts/full-width')
app.set('view engine', 'ejs')
// Routes
app.get('', (req, res) => {
res.render('index', { title: 'Home Page'})
})
app.get('/about', (req, res) => {
res.render('about', { title: 'About Page', layout: './layouts/sidebar' })
})
// Listen on Port 5000
app.listen(port, () => console.info(`App listening on port ${port}`))
and my i have follow json file

Answer 1

look at my codes
import i18nMiddleware from "i18next-express-middleware";
import { default as i18n } from "i18next";
import Backend from "i18next-node-fs-backend";
i18n
.use(Backend)
.use(LanguageDetector)
.init({
lng: "en",
whitelist: ["en", "fa"],
fallbackLng: "en",
// have a common namespace used around the full app
ns: ["translation"],
debug: false,
backend: {
loadPath: path.join(__dirname + "/locales/{{lng}}/{{ns}}.json")
// jsonIndent: 2
},
preload: ["en", "fa"]
});
this.app.use(i18nMiddleware.handle(i18n));
path locals/en/translate.js
{
"api": {
"events": {
"email": "email",
"fileMimiType": "File mimi type is not allowed",
"fileSize": "File size Can not greater then "
}
}
call it
i18n.t('api.events.email')