Unable to prepare route [{fallbackPlaceholder}] for serialization. Uses Closure In Laravel

In your Laravel production environment you will be doing php artisan route:cache but sometimes you will come across a wired error that goes something like the following

Unable to prepare route [{fallbackPlaceholder}] for serialization. Uses Closure.

 at vendor/laravel/framework/src/Illuminate/Routing/Route.php:1056
  1052|   */
  1053|   public function prepareForSerialization()
  1054|   {
  1055|     if ($this->action['uses'] instanceof Closure) {
 > 1056|       throw new LogicException("Unable to prepare route [{$this->uri}] for serialization. Uses Closure.");
  1057|     }
  1058| 
  1059|     $this->compileRoute();
  1060| 

   +15 vendor frames 
 16 artisan:37
   Illuminate\Foundation\Console\Kernel::handle(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

In this article you will learn how to resolve this issue in Laravel.

---

Prerequisites

Working Laravel application or a fresh installation of Laravel.

---

Why This Problem Occurs?

One of the basic question is to check why does this problem occur. After a careful observation of the error you will get to know that in you web.php or api.php you might have used closure routes like the following

/** Fallback Route */
Route::fallback(function () {
    return view('errors.404');
});

Nothing wrong in the working of the above code. Its just a closure inside your route. The problem comes when you push the same closure route to your production.

When you run the following command in your production

php artisan route:cache

You will get the error shown in the intro of this article.

---

How To Resolve It? Here Is The Solution

Already you know that you get this error because of closure in your routes. So avoid using it by the following way

/** Fallback Route */
Route::fallback("ErrorsController@show404");

Create ErrorsController you can rename it to whatever you need and even the name of the method from show404 to other name as per your needs.

php artisan make:controller ErrorsController

In your ErrorsController add the following code

class ErrorsController extends Controller
{
    public function show404()
    {
        return view('errors.404');
    }
}

---

Testing Code & Re-Running route:cache

Now, Once you add the above code. Push the code to production and re run the route:cache command like the following

php artisan route:cache

You will be able to see the success message

Route cache cleared!
Routes cached successfully!

---

Conclusion

Hope this article was helpful. You might be also interested in reading few of my other articles which will be really helpful for you

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