i18n.changeLanguage is not a function

Question

This is my code.

import React, { Suspense } from 'react';
import { useTranslation } from 'react-i18next';

function Page() {
  const { t, i18n } = useTranslation();

  const changeLanguage = lng => {
    i18n.changeLanguage(lng);
  };

  return (
    <div className="App">
      <div className="App-header">
        <button onClick={() => changeLanguage('de')}>de</button>
        <button onClick={() => changeLanguage('en')}>en</button>
      </div>
      <div>{t('test')}</div>
    </div>
  );
}

export default function App() {
  return (
    <Suspense fallback={<div>loading...</div>}>
      <Page />
    </Suspense>
  );
}

when I click on the de en button. I get this error. TypeError: i18n.changeLanguage is not a function.How to fix?

Answer 1

Looks like you haven't configured i18next.

You will need to create a file i18n.js containing the following content:

import i18n from 'i18next';
import { initReactI18next } from 'react-i18next';

import Backend from 'i18next-xhr-backend';
import LanguageDetector from 'i18next-browser-languagedetector';


i18n
  .use(Backend)
  .use(LanguageDetector)
  .use(initReactI18next)
  .init({
    fallbackLng: 'en',
    debug: true,

    interpolation: {
      escapeValue: false,
    }
  });
export default i18n;

Then import it in your index.js:

import React, { Component } from "react";
import ReactDOM from "react-dom";
import App from './App';

import './i18n';

ReactDOM.render(
  <App />,
  document.getElementById("root")
);

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