A simple and minimalistic React hook library for i18n.

Usage no npm install needed!

<script type="module">
  import useMini18n from '';



Build Status

use-mini18n - logo image

A simple and minimalistic React hook library for i18n.
It is simple but not full of features.
In that case, I would recommend using another library for i18n.


npm insatll use-mini18n
# or
yarn add use-mini18n


This is an example using Next.js.

See also examples.

// pages/_app.jsx
import { TransProvider } from 'use-mini18n';
import i18n from '../i18n';

export default function MyApp({ Component, pageProps }) {
  return (
    <TransProvider i18n={i18n}>
      <Component {...pageProps} />

This sets the language information required for i18n.js.

// i18n.js
const i18n = {
   * The first language will be set as the default language.
   * However, it is also possible to set the default language by specifying defaultLang.
  en: {
    'Hello Next.js': 'Hello Next.js',
    'Hello someone': 'Hello {name1} and {name2}',
  ja: {
    'Hello Next.js': 'こんにちは Next.js',
    'Hello someone': 'こんにちは {name1} と {name2}',

export default i18n;

Use useI18n.

  • t refers to text with selected language.
  • lang returns the currently selected language.
  • langs returns a list of language information set in i18n.js.
  • Change to another language using the changeLang function.
  • Get the text dynamically by passing set parameters and text keys to the getText function.
// pages/index.jsx
import Layout from '../components/Layout';
import { useI18n } from 'use-mini18n';

const IndexPage = () => {
  const { t, lang, langs, changeLang, getText } = useI18n();

  return (
    <Layout title="Home | Next.js + TypeScript Example">
      <h1>{t['Hello Next.js']} 👋</h1>
        {getText('Hello someone', { name1: 'TestUser1', name2: 'TestUser2' })}
      <p>Selected Language: {lang}</p>
        onChange={({ target }) => changeLang(target.value)}
        {, i) => (
          <option value={l} key={i}>

export default IndexPage;

Store selected language (localStorage)

use-mini18n stores the selected language information in localStorage.

Screen shot of about of store selected language

Disable localStorage

It is also possible to disable the use of localStorage by passing an option during initialization.

<TransProvider i18n={i18n} enableLocalStorage={false}>
  <App />

Specify localStorage key

If you want to specify the key for localStorage, initialize it this way.

<TransProvider i18n={i18n} localStorageKey="specifyLocalStorageKey">
  <App />



npm run test

Code format

test run fmt

When trying out a version under development in an example app (Next.js)

You can try out the built library with the sample application under the example directory. Rewrite the code as shown below. (The built library is assumed to be stored in example/dev-lib)

diff --git a/examples/nextjs-with-typescript/pages/_app.tsx b/examples/nextjs-with-typescript/pages/_app.tsx
index d07d392..66c97ec 100644
--- a/examples/nextjs-with-typescript/pages/_app.tsx
+++ b/examples/nextjs-with-typescript/pages/_app.tsx
@@ -1,4 +1,4 @@
-import { TransProvider } from 'use-mini18n';
+import { TransProvider } from '../dev-lib/use-mini18n';
 import i18n from '../i18n';
 import type { AppProps } from 'next/app';

diff --git a/examples/nextjs-with-typescript/pages/index.tsx b/examples/nextjs-with-typescript/pages/index.tsx
index a603408..756848f 100644
--- a/examples/nextjs-with-typescript/pages/index.tsx
+++ b/examples/nextjs-with-typescript/pages/index.tsx
@@ -1,5 +1,5 @@
 import Layout from '../components/Layout';
-import { useI18n } from 'use-mini18n';
+import { useI18n } from '../dev-lib/use-mini18n';

 const IndexPage = () => {
   const { t, lang, langs, changeLang, getText } = useI18n();


MIT (except for examples/ directory)

In the example directory, the code Example created with Next.js is stored. Please refer to the Next.js page for the Licence here.


Yuki Shindo