API Platform: How to add XDebug breakpoint on 500 error

Ensure you’ve installed XDebug and then add a file at src/EventSubscriber/ApiExceptionListener.php:

<?php

declare(strict_types=1);

namespace App\EventSubscriber;

use Symfony\Component\EventDispatcher\Attribute\AsEventListener;
use Symfony\Component\HttpKernel\Event\ExceptionEvent;
use Symfony\Component\HttpKernel\KernelEvents;

#[AsEventListener(event: KernelEvents::EXCEPTION, method: 'onKernelException')]
final readonly class ApiExceptionListener
{
    public function onKernelException(ExceptionEvent $event): void
    {
        $exception = $event->getThrowable();
        $foo       = 'bar'; // Any line will do. This is just so that we can set the breakpoint here
    }
}

Set the breakpoint here: