first upload all files

Modules/Category/Http/Responses/CategoryTreeResponse.php

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+<?php
+
+namespace Modules\Category\Http\Responses;
+
+use Illuminate\Contracts\Support\Responsable;
+
+class CategoryTreeResponse implements Responsable
+{
+    /**
+     * Categories collection.
+     *
+     * @var \Illuminate\Database\Eloquent\Collection
+     */
+    private $categories;
+
+    /**
+     * Create a new instance.
+     *
+     * @param \Illuminate\Database\Eloquent\Collection $categories
+     */
+    public function __construct($categories)
+    {
+        $this->categories = $categories;
+    }
+
+    /**
+     * Create an HTTP response that represents the object.
+     *
+     * @param \Illuminate\Http\Request $request
+     * @return \Illuminate\Http\Response
+     */
+    public function toResponse($request)
+    {
+        return response()->json($this->transform());
+    }
+
+    /**
+     * Transform the categories.
+     *
+     * @return \Illuminate\Support\Collection
+     */
+    private function transform()
+    {
+        return $this->categories->map(function ($category) {
+            return [
+                'id' => $category->id,
+                'parent' => $category->parent_id ?: '#',
+                'text' => $category->name,
+                'data' => [
+                    'position' => $category->position,
+                ],
+            ];
+        });
+    }
+}