---
createdAt: 2025-09-04
updatedAt: 2025-10-03
title: How to translate your React Router v7 app – i18n guide 2025
description: Learn how to add internationalization (i18n) to your React Router v7 application using Intlayer. Follow this comprehensive guide to make your app multilingual with locale-aware routing.
keywords:
  - Internationalization
  - Documentation
  - Intlayer
  - React Router v7
  - React
  - i18n
  - TypeScript
  - Locale Routing
slugs:
  - doc
  - environment
  - vite-and-react
  - react-router-v7
applicationTemplate: https://github.com/aymericzip/intlayer-react-router-v7-template
history:
  - version: 6.1.5
    date: 2025-10-03
    changes: Updated doc
  - version: 5.8.2
    date: 2025-09-04
    changes: Added for React Router v7
---

# Translate your React Router v7 website using Intlayer | Internationalization (i18n)

This guide demonstrates how to integrate **Intlayer** for seamless internationalization in React Router v7 projects with locale-aware routing, TypeScript support, and modern development practices.

## Table of Contents

<TOC/>

## What is Intlayer?

**Intlayer** is an innovative, open-source internationalization (i18n) library designed to simplify multilingual support in modern web applications.

With Intlayer, you can:

- **Easily manage translations** using declarative dictionaries at the component level.
- **Dynamically localize metadata**, routes, and content.
- **Ensure TypeScript support** with autogenerated types, improving autocompletion and error detection.
- **Benefit from advanced features**, like dynamic locale detection and switching.
- **Enable locale-aware routing** with React Router v7's configuration-based routing system.

---

## Step-by-Step Guide to Set Up Intlayer in a React Router v7 Application

### Step 1: Install Dependencies

Install the necessary packages using your preferred package manager:

```bash packageManager="npm"
npm install intlayer react-intlayer
npm install vite-intlayer --save-dev
```

```bash packageManager="pnpm"
pnpm add intlayer react-intlayer
pnpm add vite-intlayer --save-dev
```

- **intlayer**

  The core package that provides internationalization tools for configuration management, translation, [content declaration](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/dictionary/content_file.md), transpilation, and [CLI commands](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/intlayer_cli.md).

- **react-intlayer**
  The package that integrates Intlayer with React application. It provides context providers and hooks for React internationalization.

- **vite-intlayer**
  Includes the Vite plugin for integrating Intlayer with the [Vite bundler](https://vite.dev/guide/why.html#why-bundle-for-production), as well as middleware for detecting the user's preferred locale, managing cookies, and handling URL redirection.

### Step 2: Configuration of your project

Create a config file to configure the languages of your application:

```typescript fileName="intlayer.config.ts" codeFormat="typescript"
import { type IntlayerConfig, Locales } from "intlayer";

const config: IntlayerConfig = {
  internationalization: {
    defaultLocale: Locales.ENGLISH,
    locales: [Locales.ENGLISH, Locales.FRENCH, Locales.SPANISH],
  },
};

export default config;
```

```javascript fileName="intlayer.config.mjs" codeFormat="esm"
import { Locales } from "intlayer";

/** @type {import('intlayer').IntlayerConfig} */
const config = {
  internationalization: {
    defaultLocale: Locales.ENGLISH,
    locales: [Locales.ENGLISH, Locales.FRENCH, Locales.SPANISH],
  },
};

export default config;
```

```javascript fileName="intlayer.config.cjs" codeFormat="commonjs"
const { Locales } = require("intlayer");

/** @type {import('intlayer').IntlayerConfig} */
const config = {
  internationalization: {
    defaultLocale: Locales.ENGLISH,
    locales: [Locales.ENGLISH, Locales.FRENCH, Locales.SPANISH],
  },
};

module.exports = config;
```

> Through this configuration file, you can set up localized URLs, middleware redirection, cookie names, the location and extension of your content declarations, disable Intlayer logs in the console, and more. For a complete list of available parameters, refer to the [configuration documentation](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/configuration.md).

### Step 3: Integrate Intlayer in Your Vite Configuration

Add the intlayer plugin into your configuration:

```typescript fileName="vite.config.ts"
import { reactRouter } from "@react-router/dev/vite";
import { defineConfig } from "vite";
import { intlayer } from "vite-intlayer";
import tsconfigPaths from "vite-tsconfig-paths";

export default defineConfig({
  plugins: [reactRouter(), tsconfigPaths(), intlayer()],
});
```

> The `intlayer()` Vite plugin is used to integrate Intlayer with Vite. It ensures the building of content declaration files and monitors them in development mode. It defines Intlayer environment variables within the Vite application. Additionally, it provides aliases to optimize performance.

### Step 4: Configure React Router v7 Routes

Set up your routing configuration with locale-aware routes:

```typescript fileName="app/routes.ts"
import { layout, route, type RouteConfig } from "@react-router/dev/routes";

export default [
  layout("routes/layout.tsx", [
    route("/:lang?", "routes/page.tsx"), // Localized home page
    route("/:lang?/about", "routes/about/page.tsx"), // Localized about page
  ]),
] satisfies RouteConfig;
```

### Step 5: Create Layout Components

Set up your root layout and locale-specific layouts:

#### Root Layout

```tsx fileName="app/routes/layout.tsx"
import { IntlayerProvider } from "react-intlayer";
import { Outlet } from "react-router";

import type { Route } from "./+types/layout";

export default function RootLayout({ params }: Route.ComponentProps) {
  const { locale } = params;

  return (
    <IntlayerProvider locale={locale}>
      <Outlet />
    </IntlayerProvider>
  );
}
```

### Step 6: Declare Your Content

Create and manage your content declarations to store translations:

```tsx fileName="app/routes/[lang]/page.content.ts"
import { t, type Dictionary } from "intlayer";

const pageContent = {
  key: "page",
  content: {
    title: t({
      en: "Welcome to React Router v7 + Intlayer",
      es: "Bienvenido a React Router v7 + Intlayer",
      fr: "Bienvenue sur React Router v7 + Intlayer",
    }),
    description: t({
      en: "Build multilingual applications with ease using React Router v7 and Intlayer.",
      es: "Cree aplicaciones multilingües fácilmente usando React Router v7 y Intlayer.",
      fr: "Créez des applications multilingues facilement avec React Router v7 et Intlayer.",
    }),
    aboutLink: t({
      en: "Learn About Us",
      es: "Aprender Sobre Nosotros",
      fr: "En savoir plus sur nous",
    }),
    homeLink: t({
      en: "Home",
      es: "Inicio",
      fr: "Accueil",
    }),
  },
} satisfies Dictionary;

export default pageContent;
```

> Your content declarations can be defined anywhere in your application as soon they are included into the `contentDir` directory (by default, `./app`). And match the content declaration file extension (by default, `.content.{json,ts,tsx,js,jsx,mjs,mjx,cjs,cjx}`).

> For more details, refer to the [content declaration documentation](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/dictionary/content_file.md).

### Step 7: Create Locale-Aware Components

Create a `LocalizedLink` component for locale-aware navigation:

```tsx fileName="app/components/localized-link.tsx"
import type { FC } from "react";

import { getLocalizedUrl, type LocalesValues } from "intlayer";
import { useLocale } from "react-intlayer";
import { Link, type LinkProps, type To } from "react-router";

const isExternalLink = (to: string) => /^(https?:)?\/\//.test(to);

export const locacalizeTo = (to: To, locale: LocalesValues): To => {
  if (typeof to === "string") {
    if (isExternalLink(to)) {
      return to;
    }

    return getLocalizedUrl(to, locale);
  }

  if (isExternalLink(to.pathname ?? "")) {
    return to;
  }

  return {
    ...to,
    pathname: getLocalizedUrl(to.pathname ?? "", locale),
  };
};

export const LocalizedLink: FC<LinkProps> = (props) => {
  const { locale } = useLocale();

  return <Link {...props} to={locacalizeTo(props.to, locale)} />;
};
```

In the case you want to navigate to the localized routes, you can use the `useLocalizedNavigate` hook:

```tsx fileName="app/hooks/useLocalizedNavigate.ts"
import { useLocale } from "react-intlayer";
import { type NavigateOptions, type To, useNavigate } from "react-router";

import { locacalizeTo } from "~/components/localized-link";

export const useLocalizedNavigate = () => {
  const navigate = useNavigate();
  const { locale } = useLocale();

  const localizedNavigate = (to: To, options?: NavigateOptions) => {
    const localedTo = locacalizeTo(to, locale);

    navigate(localedTo, options);
  };

  return localizedNavigate;
};
```

### Step 8: Utilize Intlayer in Your Pages

Access your content dictionaries throughout your application:

#### Localized Home Page

```tsx fileName="app/routes/[lang]/page.tsx"
import { useIntlayer } from "react-intlayer";
import { LocalizedLink } from "~/components/localized-link";

export default function Page() {
  const { title, description, aboutLink } = useIntlayer("page");

  return (
    <div>
      <h1>{title}</h1>
      <p>{description}</p>
      <nav>
        <LocalizedLink to="/about">{aboutLink}</LocalizedLink>
      </nav>
    </div>
  );
}
```

> To Learn more about the `useIntlayer` hook, refer to the [documentation](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/packages/react-intlayer/useIntlayer.md).

### Step 9: Create a Locale Switcher Component

Create a component to allow users to change languages:

```tsx fileName="app/components/locale-switcher.tsx"
import type { FC } from "react";

import {
  getHTMLTextDir,
  getLocaleName,
  getLocalizedUrl,
  getPathWithoutLocale,
} from "intlayer";
import { setLocaleCookie, useIntlayer, useLocale } from "react-intlayer";
import { Link, useLocation } from "react-router";

export const LocaleSwitcher: FC = () => {
  const { localeSwitcherLabel } = useIntlayer("locale-switcher");
  const { pathname } = useLocation();

  const { availableLocales, locale } = useLocale();

  const pathWithoutLocale = getPathWithoutLocale(pathname);

  return (
    <ol>
      {availableLocales.map((localeItem) => (
        <li key={localeItem}>
          <Link
            aria-current={localeItem === locale ? "page" : undefined}
            aria-label={`${localeSwitcherLabel.value} ${getLocaleName(localeItem)}`}
            onClick={() => setLocaleCookie(localeItem)}
            to={getLocalizedUrl(pathWithoutLocale, localeItem)}
          >
            <span>
              {/* Locale - e.g. FR */}
              {localeItem}
            </span>
            <span>
              {/* Language in its own Locale - e.g. Français */}
              {getLocaleName(localeItem, locale)}
            </span>
            <span dir={getHTMLTextDir(localeItem)} lang={localeItem}>
              {/* Language in current Locale - e.g. Francés with current locale set to Locales.SPANISH */}
              {getLocaleName(localeItem)}
            </span>
            <span dir="ltr" lang={Locales.ENGLISH}>
              {/* Language in English - e.g. French */}
              {getLocaleName(localeItem, Locales.ENGLISH)}
            </span>
          </Link>
        </li>
      ))}
    </ol>
  );
};
```

> To Learn more about the `useLocale` hook, refer to the [documentation](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/packages/react-intlayer/useLocale.md).

### Step 10: Add HTML Attributes Management (Optional)

Create a hook to manage HTML lang and dir attributes:

```tsx fileName="app/hooks/useI18nHTMLAttributes.tsx"
import { getHTMLTextDir } from "intlayer";
import { useEffect } from "react";
import { useLocale } from "react-intlayer";

export const useI18nHTMLAttributes = () => {
  const { locale } = useLocale();

  useEffect(() => {
    document.documentElement.lang = locale;
    document.documentElement.dir = getHTMLTextDir(locale);
  }, [locale]);
};
```

Then use it in your root component:

```tsx fileName="app/routes/layout.tsx"
import { Outlet } from "react-router";
import { IntlayerProvider } from "react-intlayer";

import { useI18nHTMLAttributes } from "app/hooks/useI18nHTMLAttributes"; // import the hook

export default function RootLayout() {
  useI18nHTMLAttributes(); // call the hook

  return (
    <IntlayerProvider>
      <Outlet />
    </IntlayerProvider>
  );
}
```

### Step 11: Add middleware (Optional)

You can also use the `intlayerMiddleware` to add server-side routing to your application. This plugin will automatically detect the current locale based on the URL and set the appropriate locale cookie. If no locale is specified, the plugin will determine the most appropriate locale based on the user's browser language preferences. If no locale is detected, it will redirect to the default locale.

> Note that to use the `intlayerMiddleware` in production, you need to switch the `vite-intlayer` package from `devDependencies` to `dependencies`.

```typescript {3,7} fileName="vite.config.ts"
import { defineConfig } from "vite";
import react from "@vitejs/plugin-react-swc";
import { intlayer, intlayerMiddleware } from "vite-intlayer";

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [react(), intlayer(), intlayerMiddleware()],
});
```

---

## Configure TypeScript

Intlayer uses module augmentation to get benefits of TypeScript and make your codebase stronger.

Ensure your TypeScript configuration includes the autogenerated types:

```json5 fileName="tsconfig.json"
{
  // ... your existing configurations
  include: [
    // ... your existing includes
    ".intlayer/**/*.ts", // Include the auto-generated types
  ],
}
```

---

## Git Configuration

It is recommended to ignore the files generated by Intlayer. This allows you to avoid committing them to your Git repository.

To do this, you can add the following instructions to your `.gitignore` file:

```plaintext fileName=".gitignore"
# Ignore the files generated by Intlayer
.intlayer
```

---

## VS Code Extension

To improve your development experience with Intlayer, you can install the official **Intlayer VS Code Extension**.

[Install from the VS Code Marketplace](https://marketplace.visualstudio.com/items?itemName=intlayer.intlayer-vs-code-extension)

This extension provides:

- **Autocompletion** for translation keys.
- **Real-time error detection** for missing translations.
- **Inline previews** of translated content.
- **Quick actions** to easily create and update translations.

For more details on how to use the extension, refer to the [Intlayer VS Code Extension documentation](https://intlayer.org/doc/vs-code-extension).

---

## Go Further

To go further, you can implement the [visual editor](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/intlayer_visual_editor.md) or externalize your content using the [CMS](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/intlayer_CMS.md).

---

## Documentation References

- [Intlayer Documentation](https://intlayer.org)
- [React Router v7 Documentation](https://reactrouter.com/)
- [useIntlayer hook](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/packages/react-intlayer/useIntlayer.md)
- [useLocale hook](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/packages/react-intlayer/useLocale.md)
- [Content Declaration](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/dictionary/content_file.md)
- [Configuration](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/configuration.md)

This comprehensive guide provides everything you need to integrate Intlayer with React Router v7 for a fully internationalized application with locale-aware routing and TypeScript support.
