diff --git a/src/Support/Generator/Types/ArrayType.php b/src/Support/Generator/Types/ArrayType.php
index be81dfa4..0f864e25 100644
--- a/src/Support/Generator/Types/ArrayType.php
+++ b/src/Support/Generator/Types/ArrayType.php
@@ -12,11 +12,11 @@ class ArrayType extends Type
     /** @var Type|Schema */
     public $prefixItems = [];
 
-    private $minItems = null;
+    public $minItems = null;
 
-    private $maxItems = null;
+    public $maxItems = null;
 
-    private $additionalItems = null;
+    public $additionalItems = null;
 
     public function __construct()
     {
diff --git a/src/Support/Generator/Types/NumberType.php b/src/Support/Generator/Types/NumberType.php
index 4d560fe5..fd11bf56 100644
--- a/src/Support/Generator/Types/NumberType.php
+++ b/src/Support/Generator/Types/NumberType.php
@@ -4,9 +4,9 @@
 
 class NumberType extends Type
 {
-    private $min = null;
+    public $min = null;
 
-    private $max = null;
+    public $max = null;
 
     public function __construct($type = 'number')
     {
diff --git a/src/Support/Generator/Types/StringType.php b/src/Support/Generator/Types/StringType.php
index ea326094..ee863ca3 100644
--- a/src/Support/Generator/Types/StringType.php
+++ b/src/Support/Generator/Types/StringType.php
@@ -4,8 +4,34 @@
 
 class StringType extends Type
 {
+    public $min = null;
+
+    public $max = null;
+
     public function __construct()
     {
         parent::__construct('string');
     }
+
+    public function setMin($min)
+    {
+        $this->min = $min;
+
+        return $this;
+    }
+
+    public function setMax($max)
+    {
+        $this->max = $max;
+
+        return $this;
+    }
+
+    public function toArray()
+    {
+        return array_merge(parent::toArray(), array_filter([
+            'minLength' => $this->min,
+            'maxLength' => $this->max,
+        ], fn ($v) => $v !== null));
+    }
 }
diff --git a/src/Support/OperationExtensions/RulesExtractor/RulesMapper.php b/src/Support/OperationExtensions/RulesExtractor/RulesMapper.php
index 1d8269e4..ac47f824 100644
--- a/src/Support/OperationExtensions/RulesExtractor/RulesMapper.php
+++ b/src/Support/OperationExtensions/RulesExtractor/RulesMapper.php
@@ -115,7 +115,11 @@ public function required(Type $type)
 
     public function min(Type $type, $params)
     {
-        if ($type instanceof NumberType || $type instanceof ArrayType) {
+        if (
+            $type instanceof NumberType
+            || $type instanceof ArrayType
+            || $type instanceof StringType
+        ) {
             $type->setMin((float) $params[0]);
         }
 
@@ -124,7 +128,11 @@ public function min(Type $type, $params)
 
     public function max(Type $type, $params)
     {
-        if ($type instanceof NumberType || $type instanceof ArrayType) {
+        if (
+            $type instanceof NumberType
+            || $type instanceof ArrayType
+            || $type instanceof StringType
+        ) {
             $type->setMax((float) $params[0]);
         }