useTranslation (hook)

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What it does
It gets the t function and i18n instance inside your functional component.
import React from 'react';
import { useTranslation } from 'react-i18next';
​
export function MyComponent() {
  const { t, i18n } = useTranslation();
  // or const [t, i18n] = useTranslation();
​
  return <p>{t('my translated text')}</p>
}
While most of the time you only need the t function to translate your content, you can also get the i18n instance (in order to change the language).
i18n.changeLanguage('en-US');
The useTranslation hook will trigger a Suspense if not ready (eg. pending load of translation files). You can set useSuspense to false if prefer not using Suspense.
When to use?
Use the useTranslation hook inside your functional components to access the translation function or i18n instance.
useTranslation params
Loading namespaces
// load a specific namespace
// the t function will be set to that namespace as default
const { t, i18n } = useTranslation('ns1');
t('key'); // will be looked up from namespace ns1
​
// load multiple namespaces
// the t function will be set to first namespace as default
const { t, i18n } = useTranslation(['ns1', 'ns2', 'ns3']);
t('key'); // will be looked up from namespace ns1
t('key', { ns: 'ns2' }); // will be looked up from namespace ns2
Overriding the i18next instance
// passing in an i18n instance
// use only if you do not like the default instance
// set by i18next.use(initReactI18next) or the I18nextProvider
import i18n from './i18n';
const { t, i18n } = useTranslation('ns1', { i18n });
Optional keyPrefix option
available in react-i18next version >= 11.12.0
depends on i18next version >= 20.6.0
// having resources like this:
/*{
  "translation": {
    "very": {
      "deeply": {
        "nested": {
          "key": "here"
        }
      }
    }
  }
}*/
// you can define a keyPrefix to be used for the resulting t function
const { t } = useTranslation('translation', { keyPrefix: 'very.deeply.nested' });
const text = t('key'); // "here"
Do not use the keyPrefix option if you want to use keys with prefixed namespace notation:
i.e.
const { t } = useTranslation('translation', { keyPrefix: 'very.deeply.nested' });
const text = t('ns:key'); // this will not work
Not using Suspense
// additional ready will state if translations are loaded or not
const { t, i18n, ready } = useTranslation('ns1', { useSuspense: false });
Not using Suspense you will need to handle the not ready state yourself by eg. render a loading component as long ready === false . Not doing so will result in rendering your translations before they loaded which will cause save missing be called although translations exists (just yet not loaded).

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withTranslation (HOC)

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Outline

What it does

When to use?

useTranslation params

Loading namespaces

Overriding the i18next instance

Optional keyPrefix option

Not using Suspense