shlink/config/autoload/errorhandler.local.php.dist

<?php

return [
    'services' => [
        'invokables' => [
            'Zend\Expressive\Whoops' => Whoops\Run::class,
            'Zend\Expressive\WhoopsPageHandler' => Whoops\Handler\PrettyPageHandler::class,
        ],
        'factories' => [
            'Zend\Expressive\FinalHandler' => Zend\Expressive\Container\WhoopsErrorHandlerFactory::class,
        ],
    ],

    'whoops' => [
        'json_exceptions' => [
            'display'    => true,
            'show_trace' => true,
            'ajax_only'  => true,
        ],
    ],
];