diff --git a/src/App.js b/src/App.js
index 226bba7..1732ae1 100644
--- a/src/App.js
+++ b/src/App.js
@@ -5,37 +5,21 @@ import PageContent from "./Components/PageContent";
 import SideMenu from "./Components/SideMenu";
 import Login from "./Pages/Login";
 import { Layout } from "antd";
-import { Constants, ClientUserDataPreview, ClientUserData } from "./constants";
-
-function useUserSession() {
-  const getUserSession = () => {
-    return JSON.parse(localStorage.getItem("session"));
-  };
-
-  const [userSession, setUserSession] = useState(getUserSession());
-
-  const saveUserSession = (session) => {
-    setUserSession(session);
-
-    if (session === undefined) {
-      localStorage.removeItem("session");
-    } else {
-      localStorage.setItem("session", JSON.stringify(session));
-    }
-  };
-
-  return {
-    setUserSession: saveUserSession,
-    userSession,
-  };
-}
+import {
+  Constants,
+  ClientUserDataContextPreview,
+  ClientUserDataContext,
+  UseUserSession,
+  WebSocketProvider,
+} from "./utils";
 
 export default function App() {
-  const { userSession, setUserSession } = useUserSession();
-  const [userData, setUserData] = useState(ClientUserDataPreview);
+  const { userSession, setUserSession } = UseUserSession();
+  const [userData, setUserData] = useState(ClientUserDataContextPreview);
 
   useEffect(() => {
     if (!userSession) return;
+
     fetch(Constants.API_ADDRESS + "/user", {
       method: "GET",
 
@@ -49,6 +33,7 @@ export default function App() {
           return res.json();
         }
 
+        setUserSession();
         return Promise.reject(res.status);
       })
       .then((data) => setUserData(data))
@@ -61,10 +46,12 @@ export default function App() {
 
   return (
     <Layout style={{ minHeight: "100vh" }}>
-      <ClientUserData.Provider value={userData}>
-        <SideMenu setUserSession={setUserSession}></SideMenu>
-        <PageContent></PageContent>
-      </ClientUserData.Provider>
+      <ClientUserDataContext.Provider value={userData}>
+        <WebSocketProvider userSession={userSession}>
+          <SideMenu setUserSession={setUserSession}></SideMenu>
+          <PageContent></PageContent>
+        </WebSocketProvider>
+      </ClientUserDataContext.Provider>
     </Layout>
   );
 }
diff --git a/src/Components/SideMenu/index.js b/src/Components/SideMenu/index.js
index 5a1ed4e..cd92800 100644
--- a/src/Components/SideMenu/index.js
+++ b/src/Components/SideMenu/index.js
@@ -9,13 +9,19 @@ import Sider from "antd/es/layout/Sider";
 import { useContext, useEffect, useState } from "react";
 import { useLocation, useNavigate } from "react-router-dom";
 import PropTypes from "prop-types";
-import { ClientUserData, Constants, UseUserSession } from "../../constants";
+import {
+  ClientUserDataContext,
+  Constants,
+  UseUserSession,
+  WebSocketTestContext,
+} from "../../utils";
 
 export default function SideMenu({ setUserSession }) {
   const { userSession } = UseUserSession();
   const location = useLocation();
   const [selectedKeys, setSelectedKeys] = useState("/");
-  const clientUserData = useContext(ClientUserData);
+  const clientUserDataContext = useContext(ClientUserDataContext);
+  const webSocketTestContext = useContext(WebSocketTestContext);
 
   useEffect(() => {
     const pathName = location.pathname;
@@ -67,10 +73,21 @@ export default function SideMenu({ setUserSession }) {
             mode="vertical"
             items={[
               {
-                icon: <Badge status="success" text="Connected" />,
+                icon: (
+                  <Badge
+                    status={webSocketTestContext.connectionBadgeStatus}
+                    text={`${
+                      webSocketTestContext.connectedWebSocketUsersCount
+                    } ${
+                      webSocketTestContext.connectedWebSocketUsersCount == 1
+                        ? "user"
+                        : "users"
+                    }  connected`}
+                  />
+                ),
               },
               {
-                label: clientUserData.Username,
+                label: clientUserDataContext.Username,
                 icon: <UserOutlined />,
               },
               {
diff --git a/src/Pages/Login/index.js b/src/Pages/Login/index.js
index fe377e8..d9f8209 100644
--- a/src/Pages/Login/index.js
+++ b/src/Pages/Login/index.js
@@ -1,7 +1,7 @@
 import { LockOutlined, LoginOutlined, UserOutlined } from "@ant-design/icons";
 import { Button, Form, Input, Modal, notification } from "antd";
 import PropTypes from "prop-types";
-import { Constants } from "../../constants";
+import { Constants } from "../../utils";
 import { useState } from "react";
 import { Buffer } from "buffer";
 
diff --git a/src/constants.js b/src/constants.js
deleted file mode 100644
index 2d8325e..0000000
--- a/src/constants.js
+++ /dev/null
@@ -1,38 +0,0 @@
-import { createContext, useState } from "react";
-
-export const Constants = {
-  API_ADDRESS: "http://localhost:8080/v1",
-};
-
-let l = "loading...";
-
-// for the data preview when the request is not finished
-export const ClientUserDataPreview = {
-  Username: l,
-  Email: l,
-};
-
-export let ClientUserData = createContext(null);
-
-export function UseUserSession() {
-  const getUserSession = () => {
-    return JSON.parse(localStorage.getItem("session"));
-  };
-
-  const [userSession, setUserSession] = useState(getUserSession());
-
-  const saveUserSession = (session) => {
-    setUserSession(session);
-
-    if (session === undefined) {
-      localStorage.removeItem("session");
-    } else {
-      localStorage.setItem("session", JSON.stringify(session));
-    }
-  };
-
-  return {
-    setUserSession: saveUserSession,
-    userSession,
-  };
-}
diff --git a/src/utils.js b/src/utils.js
new file mode 100644
index 0000000..77d30a4
--- /dev/null
+++ b/src/utils.js
@@ -0,0 +1,121 @@
+import { createContext, useEffect, useState } from "react";
+
+/**
+ * constants
+ */
+export const Constants = {
+  API_ADDRESS: "http://localhost:8080/v1",
+  WS_ADDRESS: "ws://localhost:8080/ws",
+};
+
+/**
+ * client user data
+ */
+
+let l = "loading...";
+
+// for the data preview when the request is not finished
+export const ClientUserDataContextPreview = {
+  Username: l,
+  Email: l,
+};
+
+export let ClientUserDataContext = createContext(null);
+
+/**
+ * user session
+ */
+export function UseUserSession() {
+  const getUserSession = () => {
+    return JSON.parse(localStorage.getItem("session"));
+  };
+
+  const [userSession, setUserSession] = useState(getUserSession());
+
+  const saveUserSession = (session) => {
+    setUserSession(session);
+
+    if (session === undefined) {
+      localStorage.removeItem("session");
+    } else {
+      localStorage.setItem("session", JSON.stringify(session));
+    }
+  };
+
+  return {
+    setUserSession: saveUserSession,
+    userSession,
+  };
+}
+
+/**
+ * websocket
+ */
+let webSocketContextPreview = {
+  connectionBadgeStatus: "error",
+  connectedWebSocketUsersCount: 0,
+};
+
+export const WebSocketTestContext = createContext(webSocketContextPreview);
+
+export function WebSocketProvider({ children, userSession }) {
+  const [isReady, setIsReady] = useState(false);
+  const [connectionBadgeStatus, setConnectionBadgeStatus] = useState("error");
+  const [connectedWebSocketUsersCount, setConnectedWebSocketUsersCount] =
+    useState(0);
+
+  let socket = null;
+
+  const connect = () => {
+    socket = new WebSocket(Constants.WS_ADDRESS + "?auth=" + userSession);
+
+    socket.onopen = () => {
+      console.log("connected");
+      setConnectionBadgeStatus("success");
+      setIsReady(true);
+    };
+
+    socket.onmessage = (event) => {
+      const data = JSON.parse(event.data);
+      console.log("received message", data);
+
+      const cmd = data.Cmd;
+      const Body = data.Body;
+
+      switch (cmd) {
+        case 1:
+          setConnectedWebSocketUsersCount(Body);
+          break;
+      }
+    };
+
+    socket.onclose = (event) => {
+      setIsReady(false);
+      setConnectionBadgeStatus("error");
+      console.log("closed", event.reason.code);
+
+      if (event.reason.code === 1005) return;
+
+      console.log("reconnecting...");
+
+      setTimeout(() => connect(), 1000);
+    };
+  };
+
+  useEffect(() => {
+    connect();
+
+    return () => socket.close();
+  }, []);
+
+  return (
+    <WebSocketTestContext.Provider
+      value={{
+        connectionBadgeStatus: connectionBadgeStatus,
+        connectedWebSocketUsersCount: connectedWebSocketUsersCount,
+      }}
+    >
+      {children}
+    </WebSocketTestContext.Provider>
+  );
+}