diff --git a/middlewares.js b/middlewares.js
index fa26371..946c051 100644
--- a/middlewares.js
+++ b/middlewares.js
@@ -2,12 +2,18 @@ import http from 'node:http';
 import Response from './response.js';
 
 /**
- * This middleware just prints text to console
+ * This middleware waits for a few milliseconds
  *
  * @param {http.ClientRequest} req
  * @param {Response} res
  * @param {function} next
  */
-export const helloMiddleware = (req, res) => {
-  console.log('[LOG]: Hello from `helloMiddleware` function');
+export const waitMiddleware = async (req, res) => {
+  const wait = (ms = 1000) => {
+    return new Promise((res) => {
+      setTimeout(() => res(ms), ms);
+    });
+  };
+
+  await wait(50);
 };
diff --git a/preloads/routes.js b/preloads/routes.js
index 4a2b03c..e2935eb 100644
--- a/preloads/routes.js
+++ b/preloads/routes.js
@@ -12,8 +12,8 @@ import {
 /**
  * Middlewares
  */
-import { helloMiddleware } from '../middlewares.js';
+import { waitMiddleware } from '../middlewares.js';
 
-router.get('/api/articles', getArticlesHandler).middleware([helloMiddleware]);
-router.get('/api/article/:id', getArticleHandler).middleware([helloMiddleware]);
+router.get('/api/articles', getArticlesHandler).middleware([waitMiddleware]);
+router.get('/api/articles/:id', getArticleHandler).middleware([waitMiddleware]);
 router.post('/api/article', createArticleHandler);
diff --git a/router.js b/router.js
index 7baea98..7b469da 100644
--- a/router.js
+++ b/router.js
@@ -1,7 +1,18 @@
 import http from 'node:http';
+import util from 'node:util';
 import { pathToRegexp } from 'path-to-regexp';
 import StringHelper from './helpers/string.js';
 
+/**
+ * Single route type
+ * @typedef {{ method: string, handler: function, options: RouteOptions, middlewares: Array<function> }} Route
+ */
+
+/**
+ * Route options type
+ * @typedef {{ params: Array, exact: boolean, regexp: RegExp }} RouteOptions
+ */
+
 class Router {
   constructor() {
     /**
@@ -29,8 +40,7 @@ class Router {
        * Find exact route
        */
       if (this.routes.hasOwnProperty(mask)) {
-        this.#middlewares(route, req, res);
-        route.handler(req, res);
+        this.#middlewares(route, req, res).then(() => route.handler(req, res));
         return true;
       }
 
@@ -49,8 +59,9 @@ class Router {
               req.params[param.name] = match[1];
             });
           }
-          this.#middlewares(route, req, res);
-          route.handler(req, res);
+          this.#middlewares(route, req, res).then(() =>
+            route.handler(req, res)
+          );
           return true;
         }
       }
@@ -62,20 +73,20 @@ class Router {
   /**
    * This function will execute every middleware of a route
    *
-   * @param {*} route
-   * @param {http.ClientRequest} req
-   * @param {Response} res
+   * @param {Route} route Route
+   * @param {http.ClientRequest} req HTTP Request
+   * @param {Response} res HTTP Response
    * @returns
    */
-  #middlewares(route, req, res) {
-    if (!route || !route.middlewares || !Array.isArray(route.middleware)) {
+  async #middlewares(route, req, res) {
+    if (!route || !route.middlewares || !Array.isArray(route.middlewares)) {
       return;
     }
 
     const middlewares = route.middlewares.flat();
     if (middlewares.length !== 0) {
       for (const middleware of middlewares) {
-        middleware(req, res);
+        await middleware(req, res);
       }
     }
   }