diff --git a/app/Http/Controllers/Admin/ConstController.php b/app/Http/Controllers/Admin/ConstController.php
index c6adc3e..ddf68ce 100644
--- a/app/Http/Controllers/Admin/ConstController.php
+++ b/app/Http/Controllers/Admin/ConstController.php
@@ -14,9 +14,72 @@ class ConstController extends SuperController
         parent::__construct(Cnt::class, [], ['*'], null, null, ['key']);
     }
 
-    public function showValue($key){
-        $cnt = Cnt::where('key',$key)
-            ->select('id','value','title_fa')->first();
-        return response()->json($cnt);
+    public function store(Request $request)
+    {
+        $request->merge($this->syncValueJson($request->all()));
+
+        return parent::store($request);
+    }
+
+    public function update(Request $request, $id)
+    {
+        $request->merge($this->syncValueJson($request->all()));
+
+        return parent::update($request, $id);
+    }
+
+    public function showValue($key)
+    {
+        $query = Cnt::where('key', $key)->orderByDesc('id');
+        $columns = ['id', 'value', 'title_fa'];
+        if (Cnt::hasValueJsonColumn()) {
+            $columns[] = 'value_json';
+        }
+        $cnt = $query->first($columns);
+        if (! $cnt) {
+            return response()->json(null);
+        }
+
+        $value = $cnt->value;
+        if (
+            ($value === null || $value === '')
+            && Cnt::hasValueJsonColumn()
+            && is_array($cnt->value_json)
+        ) {
+            $value = json_encode($cnt->value_json, JSON_UNESCAPED_UNICODE);
+        }
+
+        return response()->json([
+            'id' => $cnt->id,
+            'value' => $value,
+            'title_fa' => $cnt->title_fa,
+        ]);
+    }
+
+    /**
+     * ستون value_json را با JSON ذخیره‌شده در value همگام می‌کند.
+     */
+    private function syncValueJson(array $data): array
+    {
+        if (! Cnt::hasValueJsonColumn() || ! array_key_exists('value', $data)) {
+            return $data;
+        }
+
+        $raw = $data['value'];
+        if (is_array($raw)) {
+            $data['value_json'] = $raw;
+            $data['value'] = json_encode($raw, JSON_UNESCAPED_UNICODE);
+
+            return $data;
+        }
+
+        if (is_string($raw) && $raw !== '') {
+            $decoded = json_decode($raw, true);
+            if (is_array($decoded)) {
+                $data['value_json'] = $decoded;
+            }
+        }
+
+        return $data;
     }
 }