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

Articles For You

Create Gmail App Password For SMTP Mails

Upload Image In PHP?

Factories To Speed Up Test-Driven Development In Laravel

Setup Docker for NodeJs, MongoDB, MongoDB Compass

Install RabbitMQ with Docker & Running with NodeJS

Install RabbitMQ in Ubuntu 22

Localization In Laravel REST API

Resolve 404 Not Found In NGINX

Debugging Laravel Queue Email Issues

Factory States For Clean And Fluent Laravel Testing

Add Analytics To AMP (Accelerated Mobile Pages) HTML Pages

Securely Connect Server MYSQL DB From Sequel Pro / MYSQL Workbench

Lazy Load YouTube And Other Videos In Website

Random Rows In Laravel

Run Raw Queries Securely In Laravel