[Laravel] Convert dot array validation error to nested array

Handler.php

<?php

namespace App\Exceptions;

class Handler
{
    /**
     * Convert a validation exception into a JSON response.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Illuminate\Validation\ValidationException  $exception
     * @return \Illuminate\Http\JsonResponse
     */
    protected function invalidJson($request, ValidationException $exception)
    {
        $errors = [];

        foreach ($exception->errors() as $key => $value) {
            array_set($errors, $key, $value);
        }

        return response()->json($errors, $exception->status);
    }
}