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Astro i18n Next

Locale Detection

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The locale detection middleware extracts the current locale from the URL pathname and makes it available on every request via Astro.locals.locale.

Setup

src/middleware.ts
import { createI18nMiddleware } from '@otrodigital/astro-i18n-next';
import { config } from 'virtual:i18n';


export const onRequest = createI18nMiddleware(config);

How it works

The middleware checks the first segment of the URL pathname against the configured locales:

URLDetected locale
/about/en (default)
/es/sobre/es
/es/saunas/modelo-165/es
/contact/en (default)

If no locale prefix is found, it defaults to defaultLocale.

Using the locale

Access the detected locale in any .astro component:

---
const locale = Astro.locals.locale;
---


<html lang={locale}>
  <body>
    <p>Current locale: {locale}</p>
  </body>
</html>

TypeScript typing

To type Astro.locals.locale, add this to your src/env.d.ts:

declare namespace App {
  interface Locals {
    locale: string;
  }
}

Programmatic locale detection

You can also extract the locale from a URL without the middleware using getLocaleFromPath:

import { getLocaleFromPath } from 'virtual:i18n';


getLocaleFromPath('/es/sobre/');  // "es"
getLocaleFromPath('/about/');     // "en" (default)

This is useful in scripts, API routes, or any context where the middleware hasn’t run.