diff --git a/app/Http/Requests/BaseRequest.php b/app/Http/Requests/BaseRequest.php
new file mode 100644
index 0000000..99e4b8d
--- /dev/null
+++ b/app/Http/Requests/BaseRequest.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Http\Requests;
+use Illuminate\Http\Request as HttpRequest;
+use Illuminate\Support\Str;
+use Symfony\Component\HttpFoundation\ParameterBag;
+
+class BaseRequest extends HttpRequest
+{
+    // 根据实际情况调整长度
+    const JSON_MAX_LENGTH = 65535;
+
+    public function json($key = null, $default = null)
+    {
+        if (! isset($this->json)) {
+            $content = $this->getContent();
+
+            $parameters = Str::length($content) > static::JSON_MAX_LENGTH ? [] : (array) json_decode($content, true);
+
+            $this->json = new ParameterBag($parameters);
+        }
+
+        if (is_null($key)) {
+            return $this->json;
+        }
+
+        return data_get($this->json->all(), $key, $default);
+    }
+}
diff --git a/public/index.php b/public/index.php
index f3c2ebc..b9ac30b 100644
--- a/public/index.php
+++ b/public/index.php
@@ -1,7 +1,8 @@
 <?php
 
 use Illuminate\Contracts\Http\Kernel;
-use Illuminate\Http\Request;
+// use Illuminate\Http\Request;
+use App\Http\Requests\BaseRequest as Request;
 
 define('LARAVEL_START', microtime(true));