diff --git a/src/Utils.php b/src/Utils.php
index 1792200..ebe959f 100644
--- a/src/Utils.php
+++ b/src/Utils.php
@@ -295,4 +295,37 @@ class Utils
         }
         return $json['name'] . '(' . implode(',', $typeName) . ')';
     }
+
+    /**
+     * jsonToArray
+     * 
+     * @param stdClass|array $json
+     * @param int $depth
+     * @return array
+     */
+    public static function jsonToArray($json, $depth=1)
+    {
+        if (!is_int($depth)) {
+            throw new InvalidArgumentException('jsonToArray depth must be int.');
+        }
+        if ($depth <= 0) {
+            return [];
+        }
+        if ($json instanceof stdClass) {
+            $json = (array) $json;
+            $typeName = [];
+
+            foreach ($json as $key => $param) {
+                if (is_array($param) && $depth > 1) {
+                    foreach ($param as $subKey => $subParam) {
+                        $json[$key][$subKey] = self::jsonToArray($subParam, $depth-1);
+                    }
+                }
+            }
+            return $json;
+        } elseif (!is_array($json)) {
+            throw new InvalidArgumentException('jsonToArray json must be array or stdClass.');
+        }
+        return $json;
+    }
 }
\ No newline at end of file
diff --git a/test/unit/UtilsTest.php b/test/unit/UtilsTest.php
index 366d70d..1587cfb 100644
--- a/test/unit/UtilsTest.php
+++ b/test/unit/UtilsTest.php
@@ -261,4 +261,22 @@ class UtilsTest extends TestCase
 
         $this->assertEquals($methodString, 'approve(address,uint256)');
     }
+
+    /**
+     * testJsonToArray
+     * 
+     * @return void
+     */
+    public function testJsonToArray()
+    {
+        $json = json_decode($this->testJsonMethodString);
+        $jsonArray = Utils::jsonToArray($json);
+
+        $this->assertEquals($jsonArray, (array) $json);
+
+        $jsonAssoc = json_decode($this->testJsonMethodString, true);
+        $jsonArray = Utils::jsonToArray($json, 2);
+
+        $this->assertEquals($jsonArray, $jsonAssoc);
+    }
 }
\ No newline at end of file