diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..3ec544c7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+node_modules/
+.env
\ No newline at end of file
diff --git a/chat-app/backend/Dockerfile b/chat-app/backend/Dockerfile
new file mode 100644
index 00000000..b9d43a0a
--- /dev/null
+++ b/chat-app/backend/Dockerfile
@@ -0,0 +1,6 @@
+FROM node:alpine
+ENV NODE_ENV=production
+COPY . /app
+WORKDIR /app
+RUN npm --omit=dev ci
+ENTRYPOINT ["node", "websocket-server.mjs"]
\ No newline at end of file
diff --git a/chat-app/backend/package-lock.json b/chat-app/backend/package-lock.json
new file mode 100644
index 00000000..be2e32b4
--- /dev/null
+++ b/chat-app/backend/package-lock.json
@@ -0,0 +1,996 @@
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+    },
+    "node_modules/type-is": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.1.0.tgz",
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+      "dependencies": {
+        "content-type": "^2.0.0",
+        "media-typer": "^1.1.0",
+        "mime-types": "^3.0.0"
+      },
+      "engines": {
+        "node": ">= 18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/type-is/node_modules/content-type": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-2.0.0.tgz",
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+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/typedarray-to-buffer": {
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+      "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
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+      "dependencies": {
+        "is-typedarray": "^1.0.0"
+      }
+    },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
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+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/utf-8-validate": {
+      "version": "5.0.10",
+      "resolved": "https://registry.npmjs.org/utf-8-validate/-/utf-8-validate-5.0.10.tgz",
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+      "hasInstallScript": true,
+      "dependencies": {
+        "node-gyp-build": "^4.3.0"
+      },
+      "engines": {
+        "node": ">=6.14.2"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/websocket": {
+      "version": "1.0.35",
+      "resolved": "https://registry.npmjs.org/websocket/-/websocket-1.0.35.tgz",
+      "integrity": "sha512-/REy6amwPZl44DDzvRCkaI1q1bIiQB0mEFQLUrhz3z2EK91cp3n72rAjUlrTP0zV22HJIUOVHQGPxhFRjxjt+Q==",
+      "dependencies": {
+        "bufferutil": "^4.0.1",
+        "debug": "^2.2.0",
+        "es5-ext": "^0.10.63",
+        "typedarray-to-buffer": "^3.1.5",
+        "utf-8-validate": "^5.0.2",
+        "yaeti": "^0.0.6"
+      },
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
+    "node_modules/websocket/node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "dependencies": {
+        "ms": "2.0.0"
+      }
+    },
+    "node_modules/websocket/node_modules/ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A=="
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ=="
+    },
+    "node_modules/yaeti": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/yaeti/-/yaeti-0.0.6.tgz",
+      "integrity": "sha512-MvQa//+KcZCUkBTIC9blM+CU9J2GzuTytsOUwf2lidtvkx/6gnEp1QvJv34t9vdjhFmha/mUiNDbN0D0mJWdug==",
+      "deprecated": "Package no longer supported. Contact Support at https://www.npmjs.com/support for more info.",
+      "engines": {
+        "node": ">=0.10.32"
+      }
+    }
+  }
+}
diff --git a/chat-app/backend/package.json b/chat-app/backend/package.json
new file mode 100644
index 00000000..6583ac14
--- /dev/null
+++ b/chat-app/backend/package.json
@@ -0,0 +1,7 @@
+{
+  "dependencies": {
+    "cors": "^2.8.6",
+    "express": "^5.2.1",
+    "websocket": "^1.0.35"
+  }
+}
diff --git a/chat-app/backend/shared.mjs b/chat-app/backend/shared.mjs
new file mode 100644
index 00000000..91f5836b
--- /dev/null
+++ b/chat-app/backend/shared.mjs
@@ -0,0 +1,24 @@
+export function validateBody(body) {
+  if (
+    typeof body != "object" ||
+    body === null ||
+    Array.isArray(body) ||
+    !("message" in body) ||
+    !("username" in body)
+  ) {
+    return "Expected body to be a JSON object containing keys message and username.";
+  }
+  if (typeof body.message !== "string" || typeof body.username !== "string")
+    return "Message and username must be strings.";
+
+  return null;
+}
+export function validateMessage(trimmedMessage, trimmedUsername) {
+  if (trimmedMessage.length < 1 || trimmedMessage.length > 500)
+    return "Message must be between 1 and 500 characters.";
+
+  if (trimmedUsername.length < 2 || trimmedUsername.length > 100)
+    return "Username must be between 2 and 100 characters.";
+
+  return null;
+}
diff --git a/chat-app/backend/websocket-server.mjs b/chat-app/backend/websocket-server.mjs
new file mode 100644
index 00000000..fc725413
--- /dev/null
+++ b/chat-app/backend/websocket-server.mjs
@@ -0,0 +1,166 @@
+import { server as WebSocketServer } from "websocket";
+import express from "express";
+import http from "node:http";
+import cors from "cors";
+import { validateBody, validateMessage } from "./shared.mjs";
+const app = express();
+app.use(cors());
+
+const port = 4000;
+const messages = [];
+const connections = [];
+let nextMessageId = 1;
+
+const server = http.createServer(app);
+//Attach the WebSocket server
+const webSocketServer = new WebSocketServer({
+  httpServer: server,
+  autoAcceptConnections: false,
+});
+
+function handleReceivedMessage(receivedObject, connection) {
+  if (receivedObject.type === "newMessage") {
+    let body = receivedObject.data;
+
+    const validateBodyError = validateBody(body);
+    if (validateBodyError !== null) {
+      connection.sendUTF(
+        JSON.stringify({ type: "error", data: validateBodyError }),
+      );
+      return;
+    }
+    const trimmedMessage = body.message.trim();
+    const trimmedUserName = body.username.trim();
+    const validateMessageError = validateMessage(
+      trimmedMessage,
+      trimmedUserName,
+    );
+    if (validateMessageError !== null) {
+      connection.sendUTF(
+        JSON.stringify({ type: "error", data: validateMessageError }),
+      );
+      return;
+    }
+    const newMessage = {
+      id: nextMessageId++,
+      username: trimmedUserName,
+      message: trimmedMessage,
+      createdAt: new Date().toISOString(),
+      likesCount: 0,
+      dislikesCount: 0,
+    };
+    messages.push(newMessage);
+    connection.sendUTF(
+      JSON.stringify({
+        type: "message-sent",
+        data: "Message sent Successfully.",
+      }),
+    );
+    const response = JSON.stringify({
+      type: "message-added",
+      data: newMessage,
+    });
+    connections.forEach((client) => {
+      if (client.connected) {
+        client.sendUTF(response);
+      }
+    });
+  }
+  if (receivedObject.type === "reaction") {
+    //find the correct message from messages
+    //update the reaction counter
+    //send the update to the connections
+    const message = messages.find((message) => {
+      return message.id === receivedObject.data.messageId;
+    });
+    if (!message) {
+      connection.sendUTF(
+        JSON.stringify({ type: "error", data: "Message not found" }),
+      );
+      return;
+    }
+    const action = receivedObject.data.action;
+    if (action === "like") {
+      message.likesCount++;
+    }
+    if (action === "dislike") {
+      message.dislikesCount++;
+    }
+    const updatedMessage = {
+      type: "updatedMessage",
+      data: {
+        messageId: message.id,
+        likesCount: message.likesCount,
+        dislikesCount: message.dislikesCount,
+      },
+    };
+    connections.forEach((client) => {
+      if (client.connected) {
+        client.sendUTF(JSON.stringify(updatedMessage));
+      }
+    });
+  }
+}
+function originIsAllowed(origin) {
+  //check the requesting website
+  // return origin === "my front end domain"
+  return true; //for now it permits every website
+}
+
+webSocketServer.on("request", (request) => {
+  if (!originIsAllowed(request.origin)) {
+    //request.origin is the address of the frontend requesting the connection
+    //to make sure that  we only accept requests from an allowed origin
+    request.reject();
+    console.log(`connection from origin ${request.origin} rejected.`);
+    return;
+  }
+  const connection = request.accept("chat-protocol", request.origin);
+  connections.push(connection);
+  console.log(
+    `WebSocket connection accepted. Active connections: ${connections.length}`,
+  );
+  connection.sendUTF(
+    JSON.stringify({
+      type: "message-history",
+      data: messages,
+    }),
+  );
+  connection.on("message", (message) => {
+    if (message.type !== "utf8") {
+      connection.sendUTF(
+        JSON.stringify({
+          type: "error",
+          data: "Expect a text message ",
+        }),
+      );
+      return;
+    }
+    let receivedObject;
+    try {
+      receivedObject = JSON.parse(message.utf8Data);
+    } catch (error) {
+      connection.sendUTF(
+        JSON.stringify({
+          type: "error",
+          data: "Expected message to be valid JSON ",
+        }),
+      );
+      return;
+    }
+    handleReceivedMessage(receivedObject, connection);
+  });
+  connection.on("close", () => {
+    const connectionIndex = connections.indexOf(connection);
+    if (connectionIndex !== -1) {
+      connections.splice(connectionIndex, 1);
+    }
+    console.log(
+      `Websocket disconnected. Active connections:${connections.length}`,
+    );
+  });
+});
+
+server.listen(port, () => {
+  console.error(`WebSocket chat server is listening on port :${port}`);
+});
diff --git a/chat-app/chat-app-deployment.md b/chat-app/chat-app-deployment.md
new file mode 100644
index 00000000..662f1dbf
--- /dev/null
+++ b/chat-app/chat-app-deployment.md
@@ -0,0 +1,7 @@
+# chat Application Deployment
+
+Backend :
+https://hm-chat-application.trainees.hosting.cyf.academy/
+
+Frontend :
+https://ahmadhm-chat-application.trainees.hosting.cyf.academy/
\ No newline at end of file
diff --git a/chat-app/frontend/index.html b/chat-app/frontend/index.html
new file mode 100644
index 00000000..334d294b
--- /dev/null
+++ b/chat-app/frontend/index.html
@@ -0,0 +1,41 @@
+<!doctype html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <link rel="stylesheet" href="style.css">
+  <script type="module" src="websocket.mjs"></script>
+  <title>Chat</title>
+</head>
+
+<body>
+  <main>
+    <h1>Chat messages</h1>
+
+    <div id="messages-root" class="messages-container" aria-live="polite"></div>
+
+    <template id="show-message-template">
+      <article class="show-message">
+        <div class="message-body">
+          <h2 class="message-username"></h2>
+          <p class="message-content"></p>
+          <time class="message-created-time"></time>
+          <button class="reaction-btn" data-action="like">Like</button>
+          <button class="reaction-btn" data-action="dislike">Dislike</button>
+        </div>
+      </article>
+    </template>
+    <form id="message-form">
+      <label for="username-input">Username</label>
+      <input type="text" name="username" id="username-input" placeholder="Enter username" required minlength="2"
+        maxlength="100" />
+      <label for="message-input">Message</label>
+      <textarea name="message" id="message-input" required minlength="1" maxlength="500"></textarea>
+      <button type="submit" id="submit-button" disabled>Send message</button>
+    </form>
+    <p id="form-feedback" role="status" aria-live="polite"></p>
+  </main>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/chat-app/frontend/shared.mjs b/chat-app/frontend/shared.mjs
new file mode 100644
index 00000000..d2751290
--- /dev/null
+++ b/chat-app/frontend/shared.mjs
@@ -0,0 +1,79 @@
+export function sortMessagesOldestFirst(messages) {
+  return messages.sort(
+    (a, b) => new Date(a.createdAt).getTime() - new Date(b.createdAt).getTime(),
+  );
+}
+
+export function validateMessage(trimmedUsername, trimmedMessage) {
+  if (trimmedUsername.length === 0) {
+    return "The username cannot be empty or contain only spaces.";
+  }
+  if (trimmedMessage.length === 0) {
+    return "The message cannot be empty or contain only spaces.";
+  }
+  if (trimmedMessage.length < 1 || trimmedMessage.length > 500)
+    return "Message must be between 1 and 500 characters.";
+
+  if (trimmedUsername.length < 2 || trimmedUsername.length > 100)
+    return "Username must be between 2 and 100 characters.";
+
+  return null;
+}
+export function addMessageIfNew(messages, newMessage) {
+  const alreadyExists = messages.some(
+    (message) => message.id === newMessage.id,
+  );
+  if (alreadyExists) {
+    return;
+  }
+  messages.push(newMessage);
+  const newMessageCard = MessageCard(newMessage);
+  const messageRoot = document.getElementById("messages-root");
+  if (messages.length === 1) {
+    messageRoot.textContent = "";
+  }
+  messageRoot.append(newMessageCard);
+}
+
+export function MessageCard({
+  id,
+  username,
+  message,
+  createdAt,
+  likesCount,
+  dislikesCount,
+}) {
+  const template = document.getElementById("show-message-template");
+  const card = template.content.cloneNode(true);
+
+  const usernameEle = card.querySelector(".message-username");
+  usernameEle.textContent = username;
+
+  const messageEle = card.querySelector(".message-content");
+  messageEle.textContent = message;
+
+  const timeEle = card.querySelector(".message-created-time");
+  timeEle.textContent = new Date(createdAt).toLocaleString();
+  timeEle.dateTime = createdAt;
+
+  const messageElm = card.querySelector(".show-message");
+  messageElm.dataset.messageId = id;
+
+  const likeBtn = card.querySelector(`[data-action="like"]`);
+  likeBtn.textContent = `❤️ ${likesCount ?? 0}`;
+  const dislikeBtn = card.querySelector(`[data-action="dislike"]`);
+  dislikeBtn.textContent = `👎${dislikesCount ?? 0}`;
+
+  return card;
+}
+export function renderMessages(messages, rootEle) {
+  rootEle.textContent = "";
+  if (messages.length === 0) {
+    rootEle.textContent = "There are no messages to display :(";
+    return;
+  }
+  messages.forEach((message) => {
+    const card = MessageCard(message);
+    rootEle.append(card);
+  });
+}
diff --git a/chat-app/frontend/style.css b/chat-app/frontend/style.css
new file mode 100644
index 00000000..c5ada66c
--- /dev/null
+++ b/chat-app/frontend/style.css
@@ -0,0 +1,138 @@
+* {
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+  padding: 20px;
+  font-family: Arial, sans-serif;
+  color: #222;
+  background-color: #f3f4f6;
+}
+
+main {
+  width: 100%;
+  max-width: 700px;
+  margin: 30px auto;
+}
+
+h1 {
+  margin-bottom: 24px;
+  text-align: center;
+  color: #1f2937;
+}
+
+/* Messages */
+
+.messages-container {
+  min-height: 150px;
+  max-height: 500px;
+  padding: 15px;
+  overflow-y: auto;
+  background-color: white;
+  border: 1px solid #d1d5db;
+  border-radius: 10px;
+}
+
+.show-message {
+  padding: 14px;
+  margin-bottom: 12px;
+  background-color: #eff6ff;
+  border-left: 4px solid #2563eb;
+  border-radius: 6px;
+}
+
+.show-message:last-child {
+  margin-bottom: 0;
+}
+
+.message-username {
+  margin: 0 0 8px;
+  font-size: 1rem;
+  color: #1d4ed8;
+}
+
+.message-content {
+  margin: 0 0 8px;
+  line-height: 1.5;
+  overflow-wrap: anywhere;
+}
+
+.message-created-time {
+  display: block;
+  font-size: 0.8rem;
+  color: #6b7280;
+}
+
+/* Form */
+
+#message-form {
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+  padding: 20px;
+  margin-top: 20px;
+  background-color: white;
+  border: 1px solid #d1d5db;
+  border-radius: 10px;
+}
+
+label {
+  font-weight: bold;
+}
+
+input,
+textarea {
+  width: 100%;
+  padding: 10px;
+  font: inherit;
+  border: 1px solid #9ca3af;
+  border-radius: 5px;
+}
+
+textarea {
+  min-height: 100px;
+  resize: vertical;
+}
+
+input:focus,
+textarea:focus {
+  border-color: #2563eb;
+  outline: 2px solid #bfdbfe;
+}
+
+button {
+  padding: 11px 18px;
+  font: inherit;
+  font-weight: bold;
+  color: white;
+  cursor: pointer;
+  background-color: #2563eb;
+  border: none;
+  border-radius: 5px;
+}
+
+button:hover {
+  background-color: #1d4ed8;
+}
+
+button:focus-visible {
+  outline: 3px solid #93c5fd;
+  outline-offset: 2px;
+}
+
+/* Feedback */
+
+#form-feedback {
+  min-height: 24px;
+  margin: 10px 0;
+  text-align: center;
+}
+
+.success {
+  color: #15803d;
+}
+
+.error {
+  color: #b91c1c;
+}
\ No newline at end of file
diff --git a/chat-app/frontend/websocket.mjs b/chat-app/frontend/websocket.mjs
new file mode 100644
index 00000000..853e8f0c
--- /dev/null
+++ b/chat-app/frontend/websocket.mjs
@@ -0,0 +1,98 @@
+import {
+  sortMessagesOldestFirst,
+  validateMessage,
+  addMessageIfNew,
+  renderMessages,
+} from "./shared.mjs";
+
+const websocketURL = "wss://hm-chat-application.trainees.hosting.cyf.academy/";
+const websocket = new WebSocket(websocketURL, "chat-protocol");
+const rootEle = document.getElementById("messages-root");
+const submitButton = document.getElementById("submit-button");
+const formFeedbackMessage = document.getElementById("form-feedback");
+const formElm = document.getElementById("message-form");
+
+let messages = [];
+
+function handleReceivedMessage(receivedObject) {
+  if (receivedObject.type === "message-history") {
+    messages = sortMessagesOldestFirst(receivedObject.data);
+    renderMessages(messages, rootEle);
+  }
+  if (receivedObject.type === "message-added") {
+    const newMessage = receivedObject.data;
+    addMessageIfNew(messages, newMessage);
+  }
+  if (receivedObject.type === "error") {
+    formFeedbackMessage.textContent = receivedObject.data;
+    formFeedbackMessage.className = "error";
+  }
+  if (receivedObject.type === "message-sent") {
+    formFeedbackMessage.textContent = receivedObject.data;
+    formFeedbackMessage.className = "success";
+    formElm.reset();
+
+    setTimeout(() => {
+      formFeedbackMessage.textContent = "";
+      formFeedbackMessage.className = "";
+    }, 1000);
+  }
+  if (receivedObject.type === "updatedMessage") {
+    const updatedMessage = messages.find(
+      (message) => message.id === receivedObject.data.messageId,
+    );
+    updatedMessage.likesCount = receivedObject.data.likesCount;
+    updatedMessage.dislikesCount = receivedObject.data.dislikesCount;
+    renderMessages(messages, rootEle);
+  }
+}
+
+websocket.addEventListener("open", () => {
+  submitButton.disabled = false;
+});
+
+websocket.addEventListener("error", () => {
+  console.error("Websocket connection failed");
+});
+websocket.addEventListener("close", () => {
+  submitButton.disabled = true;
+});
+websocket.addEventListener("message", (event) => {
+  const receivedObject = JSON.parse(event.data);
+  handleReceivedMessage(receivedObject);
+});
+
+function handleSubmitMessage(event) {
+  event.preventDefault();
+  formFeedbackMessage.textContent = "";
+  const username = document.getElementById("username-input").value.trim();
+  const message = document.getElementById("message-input").value.trim();
+  const validateMessageError = validateMessage(username, message);
+  if (validateMessageError !== null) {
+    formFeedbackMessage.textContent = validateMessageError;
+    formFeedbackMessage.className = "error";
+    return;
+  }
+  const newMessage = {
+    username: username,
+    message: message,
+  };
+
+  websocket.send(JSON.stringify({ type: "newMessage", data: newMessage }));
+}
+function handleReaction(event) {
+  const reactionBtn = event.target.closest(".reaction-btn");
+  if (!reactionBtn) return;
+  const messageElm = event.target.closest(".show-message");
+
+  const action = reactionBtn.dataset.action;
+  const messageId = messageElm.dataset.messageId;
+  const messageReaction = {
+    type: "reaction",
+    data: { messageId: Number(messageId), action: action },
+  };
+  websocket.send(JSON.stringify(messageReaction));
+}
+
+formElm.addEventListener("submit", handleSubmitMessage);
+rootEle.addEventListener("click", handleReaction);