Answer a question

First I Initialize i18next inctance

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

const resources = {
  en: {
    translation: {
      'Welcome to React': 'Welcome to React and react'
    }
  },
  de: {
    translation: {
      'Welcome to React': 'Bienvenue à React et react-i18next'
    }
  }
};

i18n.use(initReactI18next).init({
  resources,
  lng: 'de',

  interpolation: {
    escapeValue: false
  }
});

export default i18n;

and then I am using the instance with useTranslation hook in my component

import React from 'react'
import { useTranslation } from 'react-i18next'

import classes from './intro.module.scss'

export default function Intro() {
    const { t, i18n } = useTranslation()
    return (
        <div className={classes.container}>
            <div className={classes.innerContainer}>
            <h1>{t('Welcome to React')}</h1>
            </div>
        </div>
    )
}

so now how do I change the language to de from default language I initialized in i18n instance

I have a button on my navbar and I want that when I click on that button the languages should toggle.

Answers

Try this, pass the language inside the function to invoke different languages.

import React from 'react'
import { useTranslation } from 'react-i18next'

import classes from './intro.module.scss'

export default function Intro() {
    const { t, i18n } = useTranslation()

     const changeLanguageHandler = (lang) =>
     {
       i18n.changeLanguage("de")
     }



    return (
        <div className={classes.container}>
            <div className={classes.innerContainer}>
            <h1>{t('Welcome to React')}</h1>
            </div>
        </div>
    )
}