Export JSON from i18next to the client - node.js

Question

I'm trying to export a JSON locale file from i18next to a link as an API to use on the client. The problem is that it only exports the locale that is specified in "fallbackLng", which is 'en'. How can I make it detect the locale from the "detection_options" so that the right locale is loaded and exported on the API?
// app.js
var detection_options = {
// order and from where user language should be detected
order: [/*'path', 'session', */ 'querystring', 'cookie', 'header'],
// keys or params to lookup language from
lookupQuerystring: 'lng',
lookupCookie: 'i18next',
lookupHeader: 'accept-language',
lookupSession: 'lng',
lookupPath: 'lng',
lookupFromPathIndex: 0,
// cache user language
caches: false,
}
// i18next configuration
const i18next = require('i18next');
const Backend = require('i18next-fs-backend');
const middleware = require('i18next-http-middleware');
i18next.use(Backend)
.use(middleware.LanguageDetector)
.init({
debug: true, // debug option shows that "zh-hant" is loaded correctly when the Chinese site is accessed.
detection: detection_options,
fallbackLng: ['en', 'zh'],
backend: {
loadPath(lng, ns) {
if (lng === 'zh' || lng === 'zh-HK' || lng === 'zh-TW') {
return path.join(__dirname, 'locales/zh-hant.json');
} else if (lng === 'en-US') {
return path.join(__dirname, 'locales/en.json');
}
return path.join(__dirname, 'locales/{{lng}}.json');
}
}
})
app.use(middleware.handle(i18next));
const localeController = require('../controllers/locale');
app.get('/locale', localeController.getLocale);
// locale.js
exports.getLocale = async (req, res, next) => {
var i18next = require('i18next');
res.status(200).json(
i18next.t('tree', { returnObjects: true })
)
}

Answer 1

Use the t function from within the request object, like:
https://github.com/i18next/i18next-http-middleware/issues/51#issuecomment-1094851968