Laravel_Application_YS/app/Http/Controllers/AdminController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;

class AdminController extends Controller
{
  public function index()
  {
    $files = Storage::files('test-data');
    $data = [];
    foreach($files as $file)
    {
      $id = basename($file, '.json');
      $data[$id] = json_decode(Storage::get($file));
    }
    return view('admin', compact('data'));
  }
}