laravel_sketch/app/Exceptions/Handler.php

<?php

namespace App\Exceptions;

use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
use Illuminate\Validation\ValidationException;
use Throwable;

class Handler extends ExceptionHandler
{
    /**
     * A list of exception types with their corresponding custom log levels.
     *
     * @var array<class-string<\Throwable>, \Psr\Log\LogLevel::*>
     */
    protected $levels = [
        //
    ];

    /**
     * A list of the exception types that are not reported.
     *
     * @var array<int, class-string<\Throwable>>
     */
    protected $dontReport = [
    ];

    /**
     * A list of the inputs that are never flashed to the session on validation exceptions.
     *
     * @var array<int, string>
     */
    protected $dontFlash = [
        'current_password',
        'password',
        'password_confirmation',
    ];

    /**
     * Register the exception handling callbacks for the application.
     *
     * @return void
     */
    public function register()
    {
        $this->reportable(function (Throwable $e) {
            return response()->json([
                "error" => $e->getMessage(),
            ], 400);
        });
        $this->renderable(function (ValidationException $e) {

            return response()->json([
                "error" =>json_encode($e->errors())
            ], 400);
        });
    }
}