Laravel7 Middlewareを使ってJSONの日本語文字化けに対応する

php artisan make:middleware JpJsonResponse

<?php

namespace App\Http\Middleware;

use Closure;
use Symfony\Component\HttpFoundation\JsonResponse;
class JpJsonResponse
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $response = $next($request);
        
        //JSONでない場合はそのまま
        if (!$response instanceof JsonResponse) {
            return $response;
        }

        // Unicodeエスケープさせないようにオプションを追加        
        $response->setEncodingOptions($response->getEncodingOptions() | JSON_UNESCAPED_UNICODE);

        return $response;
    }
}

protected $routeMiddleware = [
        'auth' => \App\Http\Middleware\Authenticate::class,
        'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
        'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
        'cache.headers' => \Illuminate\Http\Middleware\SetCacheHeaders::class,
        'can' => \Illuminate\Auth\Middleware\Authorize::class,
        'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
        'password.confirm' => \Illuminate\Auth\Middleware\RequirePassword::class,
        'signed' => \Illuminate\Routing\Middleware\ValidateSignature::class,
        'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
        'verified' => \Illuminate\Auth\Middleware\EnsureEmailIsVerified::class,        
        //追加します
        'JpJsonResponse' => \App\Http\Middleware\JpJsonResponse::class,
    ];

class TaskController extends Controller
{
　　//追加
    public function __construct()
    {
        $this->middleware('JpJsonResponse');
    }
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        $tasks = Task::all();
        return $tasks;
    }