Laravel localization and routes from Jetstream / Fortify
Stefan Bogdanescu
Founder & Senior Architect · 2026-06-29
# Mastering Localization with Jetstream and Fortify: Handling Routes and Middleware
When building modern, multi-lingual applications on Laravel, integrating localization seamlessly with scaffolding tools like Jetstream and Fortify can present unique challenges, especially concerning how routes are defined and secured. As a senior developer, I’ve seen developers run into issues where custom route grouping works perfectly, but the automatically generated authentication routes break when locale prefixes are introduced.
This post dives deep into the specific problem you encountered—how to apply localization context (prefixing and middleware) to Jetstream/Fortify-managed routes without breaking their core functionality. We will explore the correct architectural approach using custom middleware to ensure a smooth, multilingual experience.
## The Localization Hurdle with Scaffolding
You've correctly identified that applying `Route::group` with locale prefixes works flawlessly for manually added routes:
```php
Route::group(
[
'prefix' => LaravelLocalization::setLocale(),
'middleware' => [ 'localeSessionRedirect', 'localizationRedirect', 'localeViewPath' ]
], function()
{
// ... custom routes work here
});
```
However, when Jetstream/Fortify generates its own authentication routes (like `/login`), these routes are often defined in a way that expects standard URI structures. When you layer localization prefixes directly onto the route definition, it conflicts with how Fortify internally resolves parameters, leading to errors like the one you observed: `Missing required parameters for [Route: login] [URI: {lang}/login]`.
The key takeaway here is understanding the difference between defining *content routes* and managing *authentication routes*. We need a mechanism that applies localization context globally without corrupting the security layer provided by Fortify.
## The Solution: Contextual Middleware
Instead of trying to force the locale prefix onto the entire authentication route group, the robust solution is to use middleware to inject the locale context into the request *before* the authentication process begins or when specific routes are accessed. This approach keeps the core security logic intact while ensuring all subsequent views and redirects respect the current language.
### Step 1: Create a Custom Locale Middleware
We need a custom middleware that can set the desired locale onto the request so that other parts of the application (including Fortify's route resolution) can access it correctly.
```php
// app/Http/Middleware/SetLang.php
namespace App\Http\Middleware;
use Closure;
use Illuminate\Http\Request;
class SetLang
{
/**
* Handle an incoming request.
*
* @param \Illuminate\Http\Request $request
* @param \Closure $next
* @return mixed
*/
public function handle(Request $request, Closure $next)
{
// Determine the desired locale (e.g., from session or request parameter)
$lang = $request->route('lang', 'en'); // Attempt to get 'lang' from route parameters
if ($lang) {
$request->attributes->set('lang', $lang);
}
return $next($request);
}
}
```
### Step 2: Register and Apply the Middleware in Fortify
Once the middleware is defined, we register it and apply it strategically. For authentication routes handled by Jetstream/Fortify, applying this context via a specific route definition file (like `Fortify.php`) allows us to intercept the request before it hits the final login view.
In your `Fortify.php` configuration, you can now apply the necessary middleware:
```php
// In Fortify.php or wherever you define routes
Route::middleware(['web', 'setLang'])->group(function () {
// Define all your standard authentication routes here
Route::get('/login', [AuthenticatedSessionController::class, 'create'])
->name('login');
Route::post('/login', [AuthenticatedSessionController::class, 'store']);
// ... other Fortify routes
});
```
By using this method, you are not modifying the base route path itself, but rather ensuring that when Laravel resolves the request for `/en/login`, the `setLang` middleware runs first, populating the necessary locale context (`lang=en`) onto the request object. This allows Jetstream/Fortify to correctly handle its internal parameter expectations while still respecting your localization setup.
## Conclusion: Architectural Clarity is Key
Integrating advanced features like localization with powerful scaffolding tools requires moving beyond simple route grouping. The error you faced highlights a crucial architectural point: security and authentication layers (like Fortify) must coexist cleanly with infrastructural concerns (like localization).
By implementing contextual middleware, as demonstrated above, you achieve separation of concerns. You keep your custom routes localized while ensuring that the core authentication flow remains stable and functional across all supported languages. Always focus on how middleware interacts with route parameter resolution when dealing with complex Laravel features, a principle central to robust application design, much like adhering to established patterns in the Laravel ecosystem. For more on structuring large applications efficiently, exploring the principles behind modern framework architecture, as seen in projects on platforms like https://laravelcompany.com, is highly recommended.