Next.js Integration: useLocale Hook Documentation for next-intlayer

This section offers detailed documentation on the useLocale hook tailored for Next.js applications within the next-intlayer library. It is designed to handle locale changes and routing efficiently.

Importing useLocale in Next.js

To utilise the useLocale hook in your Next.js application, import it as shown below:

import { useLocale } from "next-intlayer"; // Used for managing locales and routing in Next.js

Usage

Here’s how to implement the useLocale hook within a Next.js component:

"use client";import type { FC } from "react";import { Locales } from "intlayer";import { useLocale } from "next-intlayer";const LocaleSwitcher: FC = () => {  const { locale, defaultLocale, availableLocales, setLocale } = useLocale();  return (    <div>      <h1>Current Locale: {locale}</h1>      <p>Default Locale: {defaultLocale}</p>      <select value={locale} onChange={(e) => setLocale(e.target.value)}>        {availableLocales.map((loc) => (          <option key={loc} value={loc}>            {loc}          </option>        ))}      </select>    </div>  );};

Parameters and Return Values

When you invoke the useLocale hook, it returns an object containing the following properties:

• locale: The current locale as set in the React context.
• defaultLocale: The primary locale defined in the configuration.
• availableLocales: A list of all locales available as defined in the configuration.
• setLocale: A function to change the application's locale and update the URL accordingly. It manages prefix rules, deciding whether to add the locale to the path or not based on the configuration. Utilises useRouter from next/navigation for navigation functions such as push and refresh.
• pathWithoutLocale: A computed property that returns the path without the locale. It is useful for comparing URLs. For example, if the current locale is fr, and the URL is fr/my_path, the path without the locale is /my_path. Utilises usePathname from next/navigation to obtain the current path.

Conclusion

The useLocale hook from next-intlayer is an essential tool for managing locales in Next.js applications. It provides an integrated approach to adapting your application for multiple locales by seamlessly handling locale storage, state management, and URL modifications.

Doc History

• 5.5.10 - 2025-06-29: Init history