diff --git a/.gitignore b/.gitignore
index 57872d0..539257e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /vendor/
+.idea/*
diff --git a/.idea/php.xml b/.idea/php.xml
index 3b1bcf5..f2e8894 100644
--- a/.idea/php.xml
+++ b/.idea/php.xml
@@ -1,9 +1,26 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="MessDetectorOptionsConfiguration">
+    <option name="transferred" value="true" />
+  </component>
+  <component name="PHPCSFixerOptionsConfiguration">
+    <option name="transferred" value="true" />
+  </component>
+  <component name="PHPCodeSnifferOptionsConfiguration">
+    <option name="highlightLevel" value="WARNING" />
+    <option name="transferred" value="true" />
+  </component>
   <component name="PhpIncludePathManager">
     <include_path>
       <path value="$PROJECT_DIR$/vendor/composer" />
+      <path value="$PROJECT_DIR$/vendor/wepesi/optionsresolver" />
     </include_path>
   </component>
   <component name="PhpProjectSharedConfiguration" php_language_level="7.4" />
+  <component name="PhpStanOptionsConfiguration">
+    <option name="transferred" value="true" />
+  </component>
+  <component name="PsalmOptionsConfiguration">
+    <option name="transferred" value="true" />
+  </component>
 </project>
\ No newline at end of file
diff --git a/.idea/wepesi_router.iml b/.idea/wepesi_router.iml
index c956989..7f6d08f 100644
--- a/.idea/wepesi_router.iml
+++ b/.idea/wepesi_router.iml
@@ -1,7 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module type="WEB_MODULE" version="4">
   <component name="NewModuleRootManager">
-    <content url="file://$MODULE_DIR$" />
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/vendor/wepesi/optionsresolver" />
+    </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
diff --git a/README.md b/README.md
index 75a569b..0364405 100644
--- a/README.md
+++ b/README.md
@@ -14,11 +14,13 @@ Built by  _([Boss Ibrahim Mussa](https://www.github.com/bim-g))_ and [Contributo
 - [Static Route Patterns](#route-patterns)
 - Dynamic Route Patterns: [Dynamic PCRE-based Route Patterns](#dynamic-pcre-based-route-patterns) or [Dynamic Placeholder-based Route Patterns](#dynamic-placeholder-based-route-patterns)
 - [Optional Route Subpatterns](#optional-route-subpatterns)
-- [Supports `X-HTTP-Method-Override` header](#overriding-the-request-method)
 - [Subrouting / Group Routing](#Subrouting-/-Groupe-Routing)
 - [Allowance of `Class@Method` calls](#classmethod-calls)
 - [Before Route Middlewares](#before-route-middlewares)
 - [Before Router Middlewares / Before App Middlewares](#before-router-middlewares)
+- [API Groupe Routing](#api-groupe-routing)
+- [Supports `X-HTTP-Method-Override` header](#overriding-the-request-method)
+- [Custom 404](#custom-404)
 - [Works fine in subfolders](#subfolder-support)
 
 
@@ -200,15 +202,7 @@ $router->group('/articles', function() use ($router) {
 
 });
 ```
-### `Setnotfound` route
-You can set your custom notfound output
-```php
-$router->set404('**',function(){
-    header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
-    print('Not Found : ' . http_response_code());
-    exit;
-});
-```
+
 
 ### `Class#Method` calls
 
@@ -231,6 +225,7 @@ $router->get('/users/profile', \Wepesi\Controller\Users::profile());
 
 ```
 Note: In case you are using static method, dont pass as string or in array.
+
 ### Before Route Middleware
 
 `wepesi/routing` supports __Before Route Middlewares__, which are executed before the route handling is processed.
@@ -258,25 +253,57 @@ $router->get('/admin/:id', function($id) {
 	print_r("Last middleware before Route function");
 });
 ```
-Groupe route middleware, you should set the `pattern` and the `middleware` in order to make it work.
+### API Groupe Routing
+
+You can define your API route inside the api method, and will auto complet api route fro you.
 ```php
-$router->group([
-'pattern'=>'/admin/:id',
-'middleware'=> function($id){
-	print_r("Groupe middleware");
-}
-], function($id) {
-    echo "admin id is:".$id;
-})->middleware(function($id){
-	print_r("First middleware");
-})->middleware(function($id){
-	print_r("Last middleware before Route function");
+$router->api('/v1',function() use($router){
+    $router->group('/users',function() use($router){
+        $router->get('/',[appController::class,'getUsers']);
+    });
 });
+// output
+// /api/v1/users
 ```
+
 ### Overriding the request method
 
 Use `X-HTTP-Method-Override` to override the HTTP Request Method. Only works when the original Request Method is `POST`. Allowed values for `X-HTTP-Method-Override` are `PUT`, `DELETE`, or `PATCH`.
 
+### Custom 404
+
+The default 404 handler sets a 404 status code and exits. You can override this default 404 handler by using `$router->set404(callable);`
+
+```php
+$router->set404(function() {
+    header('HTTP/1.1 404 Not Found');
+    // ... do something special here
+});
+```
+
+You can also define multiple custom routes e.x. you want to define an `/api` route, you can print a custom 404 page:
+
+```php
+$router->set404('**)?', function() {
+    header('HTTP/1.1 404 Not Found');
+    header('Content-Type: application/json');
+
+    $jsonArray = array();
+    $jsonArray['status'] = "404";
+    $jsonArray['status_text'] = "route not defined";
+
+    echo json_encode($jsonArray);
+});
+```
+
+Also supported are `Class@Method` callables:
+
+```php
+$router->set404([appController::class,'notfound']);
+```
+The 404 handler will be executed when no route pattern was matched to the current URL.
+
+💡 You can also manually trigger the 404 handler by calling `$router->trigger404()`
 
 ## Integration with other libraries
 
@@ -309,6 +336,13 @@ $router->put('/movies/:username', function($username) {
 });
 ```
 
+## Subfolder support
+```php
+$router->api('/v1',function() use($router){
+    include __DIR__.'/router/users.php';
+});
+```
+
 ## License
 
 `wepesi/routing` is released under the Apache-2.0 license. See the enclosed `LICENSE` for details.
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..fd20e77
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,69 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "9bf28e1a3d8c2630b8d6c5f961923a9f",
+    "packages": [
+        {
+            "name": "wepesi/optionsresolver",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/bim-g/OptionsResolver.git",
+                "reference": "3bce1f7f9b2bf9e08e7b4d6c73bc6247777430da"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/bim-g/OptionsResolver/zipball/3bce1f7f9b2bf9e08e7b4d6c73bc6247777430da",
+                "reference": "3bce1f7f9b2bf9e08e7b4d6c73bc6247777430da",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.4"
+            },
+            "default-branch": true,
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Wepesi\\Resolver\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "Apache-2.0"
+            ],
+            "authors": [
+                {
+                    "name": "bim-g",
+                    "email": "ibmussafb@gmail.com"
+                }
+            ],
+            "description": "The OptionsResolver component helps you configure objects with option arrays. It supports default values, option constraints and lazy options.",
+            "support": {
+                "docs": "https://github.com/bim-g/OptionsResolver",
+                "email": "ibmussfb@gmail.com",
+                "forum": "https://github.com/bim-g/OptionsResolver",
+                "issues": "https://github.com/bim-g/OptionsResolver/issues",
+                "source": "https://github.com/bim-g/OptionsResolver",
+                "wiki": "https://github.com/bim-g/OptionsResolver"
+            },
+            "time": "2022-12-29T12:44:59+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "dev",
+    "stability-flags": {
+        "wepesi/optionsresolver": 20
+    },
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": ">=7.4",
+        "ext-json": "*"
+    },
+    "platform-dev": [],
+    "plugin-api-version": "2.2.0"
+}
diff --git a/example/controller/UserController.php b/example/controller/UserController.php
index a55f3ea..06ce84d 100644
--- a/example/controller/UserController.php
+++ b/example/controller/UserController.php
@@ -1,5 +1,7 @@
 <?php
-
+/*
+ * Copyright (c) 2023. Wepesi inc.
+ */
 
 namespace Wepesi\Controller;
 
diff --git a/example/index.php b/example/index.php
index c7324d9..74c1e3f 100644
--- a/example/index.php
+++ b/example/index.php
@@ -1,4 +1,5 @@
 <?php
+
 use Wepesi\Controller\UserController;
 use Wepesi\Middleware\UserValidation;
 use Wepesi\Routing\Router;
@@ -10,18 +11,30 @@
 $router->get('/home',function (){
     echo 'Welcom Home';
 });
+
+$router->get('/users', [userController::class,'get_users']);
 /**
  * Group
  */
-$router->group('/users', function () use ($router) {
-    $router->get('/', [userController::class,'get_users']);
-    $router->group([
-        'pattern'=>'/group',
-        'middleware' => [userValidation::class,'detail_user']
-    ],function () use($router){
-        $router->get('/:id/detail', [userController::class, 'get_user_detail'])
-            ->middleware([userController::class, 'userExist']);
-        $router->get('/:id/delete', 'Wepesi\Controller\UserController#delete_user');
+
+$router->group([
+    'pattern'=>'/users',
+    'middleware' => [userValidation::class, 'validateId']
+],function () use($router){
+    $router->get('/:id/detail', [userController::class, 'get_user_detail'])
+        ->middleware([userController::class, 'userExist']);
+    $router->get('/:id/delete', 'Wepesi\Controller\UserController#delete_user');
+});
+/**
+ *  API Group
+ */
+$router->api('/users',function() use ($router){
+    $router->get('/',function(){
+        echo json_encode([
+            'status' => http_response_code(),
+            'message' => 'Welcom to Users API'
+        ],true);
+        exit();
     });
 });
 /**
diff --git a/example/middleware/UserValidation.php b/example/middleware/UserValidation.php
index 23ed456..5afc824 100644
--- a/example/middleware/UserValidation.php
+++ b/example/middleware/UserValidation.php
@@ -1,4 +1,7 @@
 <?php
+/*
+ * Copyright (c) 2023. Wepesi inc.
+ */
 
 namespace Wepesi\Middleware;
 
@@ -10,4 +13,11 @@ function detail_user($id){
             exit;
         }
     }
+
+    function validateId($id){
+        if (!filter_var($id, FILTER_VALIDATE_INT)) {
+            echo 'your id should be an integer';
+            exit;
+        }
+    }
 }
\ No newline at end of file
diff --git a/index.php b/index.php
index fc868ff..a9afc72 100644
--- a/index.php
+++ b/index.php
@@ -1,3 +1,7 @@
 <?php
+/*
+ * Copyright (c) 2023. Wepesi inc.
+ */
+
 include 'vendor/autoload.php';
 include "example/index.php";
\ No newline at end of file
diff --git a/src/Route.php b/src/Route.php
index 15e4f95..e0423bb 100644
--- a/src/Route.php
+++ b/src/Route.php
@@ -1,9 +1,12 @@
 <?php
+/*
+ * Copyright (c) 2023. Wepesi inc.
+ */
 
 namespace Wepesi\Routing;
 
-use Wepesi\Routing\Traits\ExecuteRouteTrait;
 use Wepesi\Routing\Traits\ExceptionTrait;
+use Wepesi\Routing\Traits\ExecuteRouteTrait;
 
 /**
  *
diff --git a/src/Router.php b/src/Router.php
index a18dd45..98cc065 100644
--- a/src/Router.php
+++ b/src/Router.php
@@ -1,4 +1,7 @@
 <?php
+/*
+ * Copyright (c) 2023. Wepesi inc.
+ */
 
 namespace Wepesi\Routing;
 
@@ -17,10 +20,11 @@ class  Router
     private string $baseRoute;
     private $notFoundCallback;
     private array $baseMiddleware;
-
+    private static  string $API_BaseRoute;
     use ExecuteRouteTrait;
     function __construct()
     {
+        self::$API_BaseRoute = '';
         $this->baseRoute = '';
         $this->routes = [];
         $this->_nameRoute = [];
@@ -106,6 +110,15 @@ public function group($base_route, callable $callable): void
         $this->baseRoute = $cur_base_route;
     }
 
+    public function api($base_route, callable $callable){
+        $pattern = '/api';
+        if(is_array($base_route)){
+            $base_route['pattern'] = $pattern .'/'. trim($base_route['pattern'],'/');
+        }else{
+            $base_route = $pattern .'/'. trim($base_route,'/');
+        }
+        return $this->group($base_route, $callable);
+    }
     /**
      * @param $middleware
      * @return callable[]
diff --git a/src/Traits/ExceptionTrait.php b/src/Traits/ExceptionTrait.php
index c051058..3a4356c 100644
--- a/src/Traits/ExceptionTrait.php
+++ b/src/Traits/ExceptionTrait.php
@@ -1,4 +1,7 @@
 <?php
+/*
+ * Copyright (c) 2023. Wepesi inc.
+ */
 
 namespace Wepesi\Routing\Traits;
 
diff --git a/src/Traits/ExecuteRouteTrait.php b/src/Traits/ExecuteRouteTrait.php
index 3f1e922..c12ead4 100644
--- a/src/Traits/ExecuteRouteTrait.php
+++ b/src/Traits/ExecuteRouteTrait.php
@@ -1,4 +1,7 @@
 <?php
+/*
+ * Copyright (c) 2023. Wepesi inc.
+ */
 
 namespace Wepesi\Routing\Traits;