diff --git a/.prettierrc b/.prettierrc
index 8c8d7fcbf..9df3f0679 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -4,5 +4,6 @@
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   "singleQuote": true,
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 }
diff --git a/package-lock.json b/package-lock.json
index ce07e1dca..4aa1b2788 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,10 @@
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+        "content-type": "^1.0.5",
+        "debug": "^4.4.3",
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@@ -2715,6 +2677,35 @@
         "url": "https://github.com/sponsors/ljharb"
       }
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+      }
+    },
+    "node_modules/socket.io/node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/socket.io/node_modules/mime-db": {
+      "version": "1.52.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
+      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/socket.io/node_modules/mime-types": {
+      "version": "2.1.35",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.35.tgz",
+      "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-db": "1.52.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/socket.io/node_modules/negotiator": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
+      "integrity": "sha512-+EUsqGPLsM+j/zdChZjsnX51g4XrHFOIXwfnCVPGlQk/k5giakcKsuxCObBRu6DSm9opw/O6slWbJdghQM4bBg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
@@ -7882,6 +8565,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/statuses": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
+      "integrity": "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/string-length": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/string-length/-/string-length-4.0.2.tgz",
@@ -8096,6 +8788,15 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
     "node_modules/tr46": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
@@ -8195,6 +8896,20 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/type-is": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.1.tgz",
+      "integrity": "sha512-OZs6gsjF4vMp32qrCbiVSkrFmXtG/AZhY3t0iAMrMBiAZyV9oALtXO8hsrHbMXF9x6L3grlFuwW2oAz7cav+Gw==",
+      "license": "MIT",
+      "dependencies": {
+        "content-type": "^1.0.5",
+        "media-typer": "^1.1.0",
+        "mime-types": "^3.0.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
     "node_modules/typed-array-buffer": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/typed-array-buffer/-/typed-array-buffer-1.0.2.tgz",
@@ -8268,20 +8983,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/typescript": {
-      "version": "5.5.4",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.5.4.tgz",
-      "integrity": "sha512-Mtq29sKDAEYP7aljRgtPOpTvOfbwRWlS6dPRzwjdE+C0R4brX/GUyhHSecbHMFLNBLcJIPt9nl9yG5TZ1weH+Q==",
-      "dev": true,
-      "peer": true,
-      "bin": {
-        "tsc": "bin/tsc",
-        "tsserver": "bin/tsserver"
-      },
-      "engines": {
-        "node": ">=14.17"
-      }
-    },
     "node_modules/unbox-primitive": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.0.2.tgz",
@@ -8300,15 +9001,7 @@
     "node_modules/undici-types": {
       "version": "5.26.5",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
-      "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
-      "dev": true
-    },
-    "node_modules/universal-user-agent": {
-      "version": "7.0.2",
-      "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-7.0.2.tgz",
-      "integrity": "sha512-0JCqzSKnStlRRQfCdowvqy3cy0Dvtlb8xecj/H8JFZuCze4rwjPZQOgvFvn0Ws/usCHQFGpyr+pB9adaGwXn4Q==",
-      "dev": true,
-      "peer": true
+      "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA=="
     },
     "node_modules/universalify": {
       "version": "2.0.1",
@@ -8319,6 +9012,15 @@
         "node": ">= 10.0.0"
       }
     },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/update-browserslist-db": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.1.0.tgz",
@@ -8372,6 +9074,15 @@
         "node": ">=10.12.0"
       }
     },
+    "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==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
     "node_modules/walker": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.8.tgz",
@@ -8642,8 +9353,7 @@
     "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==",
-      "dev": true
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ=="
     },
     "node_modules/write-file-atomic": {
       "version": "4.0.2",
@@ -8658,6 +9368,27 @@
         "node": "^12.13.0 || ^14.15.0 || >=16.0.0"
       }
     },
+    "node_modules/ws": {
+      "version": "8.18.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.18.3.tgz",
+      "integrity": "sha512-PEIGCY5tSlUt50cqyMXfCzX+oOPqN0vuGqWzbcJ2xvnkzkq46oOpz7dQaTDBdfICb4N14+GARUDw2XV2N4tvzg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
diff --git a/package.json b/package.json
index 4f64337fe..7c2f21690 100644
--- a/package.json
+++ b/package.json
@@ -26,5 +26,9 @@
   },
   "mateAcademy": {
     "projectType": "javascript"
+  },
+  "dependencies": {
+    "express": "^5.2.1",
+    "socket.io": "^4.8.3"
   }
 }
diff --git a/public/css/styles.css b/public/css/styles.css
new file mode 100644
index 000000000..46a975af3
--- /dev/null
+++ b/public/css/styles.css
@@ -0,0 +1,392 @@
+/* ===== CSS Reset & Base ===== */
+*,
+*::before,
+*::after {
+  box-sizing: border-box;
+  margin: 0;
+  padding: 0;
+}
+
+:root {
+  --primary: #4f46e5;
+  --primary-hover: #4338ca;
+  --bg: #f3f4f6;
+  --sidebar-bg: #1f2937;
+  --sidebar-text: #f9fafb;
+  --sidebar-hover: #374151;
+  --sidebar-active: #4f46e5;
+  --white: #ffffff;
+  --gray-100: #f3f4f6;
+  --gray-200: #e5e7eb;
+  --gray-300: #d1d5db;
+  --gray-400: #9ca3af;
+  --gray-600: #4b5563;
+  --gray-700: #374151;
+  --gray-800: #1f2937;
+  --danger: #ef4444;
+  --danger-hover: #dc2626;
+  --radius: 8px;
+  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
+}
+
+body {
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+  background: var(--bg);
+  color: var(--gray-800);
+  height: 100vh;
+  overflow: hidden;
+}
+
+/* ===== Modal ===== */
+.modal {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.5);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 100;
+}
+
+.modal.hidden {
+  display: none;
+}
+
+.modal-content {
+  background: var(--white);
+  padding: 40px;
+  border-radius: var(--radius);
+  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
+  text-align: center;
+  max-width: 400px;
+  width: 90%;
+}
+
+.modal-content h2 {
+  margin-bottom: 8px;
+  font-size: 1.5rem;
+  color: var(--gray-800);
+}
+
+.modal-content p {
+  margin-bottom: 24px;
+  color: var(--gray-600);
+}
+
+.modal-content form {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+}
+
+.modal-content input {
+  padding: 12px 16px;
+  border: 2px solid var(--gray-300);
+  border-radius: var(--radius);
+  font-size: 1rem;
+  outline: none;
+  transition: border-color 0.2s;
+}
+
+.modal-content input:focus {
+  border-color: var(--primary);
+}
+
+.modal-content button {
+  padding: 12px;
+  background: var(--primary);
+  color: var(--white);
+  border: none;
+  border-radius: var(--radius);
+  font-size: 1rem;
+  font-weight: 600;
+  cursor: pointer;
+  transition: background 0.2s;
+}
+
+.modal-content button:hover {
+  background: var(--primary-hover);
+}
+
+/* ===== Chat App Layout ===== */
+.chat-app {
+  display: flex;
+  height: 100vh;
+}
+
+.chat-app.hidden {
+  display: none;
+}
+
+/* ===== Sidebar ===== */
+.sidebar {
+  width: 280px;
+  background: var(--sidebar-bg);
+  color: var(--sidebar-text);
+  display: flex;
+  flex-direction: column;
+  flex-shrink: 0;
+}
+
+.sidebar-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 20px;
+  border-bottom: 1px solid var(--sidebar-hover);
+}
+
+.sidebar-header h2 {
+  font-size: 1.2rem;
+}
+
+.btn-icon {
+  width: 36px;
+  height: 36px;
+  background: var(--primary);
+  color: var(--white);
+  border: none;
+  border-radius: 50%;
+  font-size: 1.2rem;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: background 0.2s;
+}
+
+.btn-icon:hover {
+  background: var(--primary-hover);
+}
+
+/* ===== Room List ===== */
+.room-list {
+  list-style: none;
+  flex: 1;
+  overflow-y: auto;
+  padding: 8px 0;
+}
+
+.room-list li {
+  padding: 12px 20px;
+  cursor: pointer;
+  transition: background 0.15s;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  font-size: 0.95rem;
+}
+
+.room-list li::before {
+  content: '#';
+  color: var(--gray-400);
+  font-weight: 700;
+}
+
+.room-list li:hover {
+  background: var(--sidebar-hover);
+}
+
+.room-list li.active {
+  background: var(--sidebar-active);
+  font-weight: 600;
+}
+
+/* ===== Sidebar Footer ===== */
+.sidebar-footer {
+  padding: 16px 20px;
+  border-top: 1px solid var(--sidebar-hover);
+}
+
+.current-user {
+  font-size: 0.9rem;
+  color: var(--gray-400);
+}
+
+.current-user::before {
+  content: '👤 ';
+}
+
+/* ===== Chat Main ===== */
+.chat-main {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  min-width: 0;
+}
+
+.chat-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 16px 24px;
+  background: var(--white);
+  border-bottom: 1px solid var(--gray-200);
+  box-shadow: var(--shadow);
+}
+
+.chat-header h3 {
+  font-size: 1.1rem;
+}
+
+.chat-header h3::before {
+  content: '# ';
+  color: var(--gray-400);
+}
+
+.room-actions {
+  display: flex;
+  gap: 8px;
+}
+
+.btn-small {
+  padding: 6px 10px;
+  background: transparent;
+  border: 1px solid var(--gray-300);
+  border-radius: var(--radius);
+  cursor: pointer;
+  font-size: 0.85rem;
+  transition: background 0.2s;
+}
+
+.btn-small:hover {
+  background: var(--gray-100);
+}
+
+.btn-small.hidden {
+  display: none;
+}
+
+/* ===== Messages ===== */
+.messages-container {
+  flex: 1;
+  overflow-y: auto;
+  padding: 20px 24px;
+  background: var(--bg);
+}
+
+.messages-list {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+}
+
+.message {
+  padding: 8px 0;
+}
+
+.message:hover {
+  background: rgba(0, 0, 0, 0.02);
+  border-radius: var(--radius);
+}
+
+.message-header {
+  display: flex;
+  align-items: baseline;
+  gap: 8px;
+  margin-bottom: 4px;
+}
+
+.message-author {
+  font-weight: 700;
+  color: var(--gray-800);
+  font-size: 0.95rem;
+}
+
+.message-time {
+  font-size: 0.75rem;
+  color: var(--gray-400);
+}
+
+.message-text {
+  font-size: 0.95rem;
+  color: var(--gray-700);
+  line-height: 1.5;
+  word-break: break-word;
+}
+
+.system-message {
+  text-align: center;
+  color: var(--gray-400);
+  font-size: 0.85rem;
+  padding: 4px 0;
+  font-style: italic;
+}
+
+/* ===== Message Form ===== */
+.message-form {
+  display: flex;
+  gap: 12px;
+  padding: 16px 24px;
+  background: var(--white);
+  border-top: 1px solid var(--gray-200);
+}
+
+.message-form.hidden {
+  display: none;
+}
+
+.message-form input {
+  flex: 1;
+  padding: 12px 16px;
+  border: 2px solid var(--gray-300);
+  border-radius: var(--radius);
+  font-size: 0.95rem;
+  outline: none;
+  transition: border-color 0.2s;
+}
+
+.message-form input:focus {
+  border-color: var(--primary);
+}
+
+.message-form button {
+  padding: 12px 24px;
+  background: var(--primary);
+  color: var(--white);
+  border: none;
+  border-radius: var(--radius);
+  font-size: 0.95rem;
+  font-weight: 600;
+  cursor: pointer;
+  transition: background 0.2s;
+}
+
+.message-form button:hover {
+  background: var(--primary-hover);
+}
+
+/* ===== Scrollbar ===== */
+.messages-container::-webkit-scrollbar,
+.room-list::-webkit-scrollbar {
+  width: 6px;
+}
+
+.messages-container::-webkit-scrollbar-thumb,
+.room-list::-webkit-scrollbar-thumb {
+  background: var(--gray-300);
+  border-radius: 3px;
+}
+
+.room-list::-webkit-scrollbar-thumb {
+  background: var(--sidebar-hover);
+}
+
+/* ===== Responsive ===== */
+@media (max-width: 640px) {
+  .sidebar {
+    width: 220px;
+  }
+
+  .chat-header {
+    padding: 12px 16px;
+  }
+
+  .messages-container {
+    padding: 12px 16px;
+  }
+
+  .message-form {
+    padding: 12px 16px;
+  }
+}
diff --git a/public/index.html b/public/index.html
new file mode 100644
index 000000000..cd3b3eb04
--- /dev/null
+++ b/public/index.html
@@ -0,0 +1,88 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Node Chat</title>
+    <link rel="stylesheet" href="/css/styles.css" />
+  </head>
+  <body>
+    <!-- Username Modal -->
+    <div id="usernameModal" class="modal">
+      <div class="modal-content">
+        <h2>Welcome to Node Chat</h2>
+        <p>Enter your username to start chatting</p>
+        <form id="usernameForm">
+          <input
+            type="text"
+            id="usernameInput"
+            placeholder="Your username..."
+            autocomplete="off"
+            required
+            minlength="2"
+            maxlength="20"
+          />
+          <button type="submit">Join Chat</button>
+        </form>
+      </div>
+    </div>
+
+    <!-- Main Chat Layout -->
+    <div id="chatApp" class="chat-app hidden">
+      <!-- Sidebar -->
+      <aside class="sidebar">
+        <div class="sidebar-header">
+          <h2>Rooms</h2>
+          <button id="createRoomBtn" class="btn-icon" title="Create Room">
+            +
+          </button>
+        </div>
+        <ul id="roomList" class="room-list"></ul>
+        <div class="sidebar-footer">
+          <span id="currentUser" class="current-user"></span>
+        </div>
+      </aside>
+
+      <!-- Chat Area -->
+      <main class="chat-main">
+        <header class="chat-header">
+          <h3 id="roomName">Select a room</h3>
+          <div class="room-actions">
+            <button
+              id="renameRoomBtn"
+              class="btn-small hidden"
+              title="Rename Room"
+            >
+              ✏️
+            </button>
+            <button
+              id="deleteRoomBtn"
+              class="btn-small hidden"
+              title="Delete Room"
+            >
+              🗑️
+            </button>
+          </div>
+        </header>
+
+        <div id="messagesContainer" class="messages-container">
+          <div id="messagesList" class="messages-list"></div>
+        </div>
+
+        <form id="messageForm" class="message-form hidden">
+          <input
+            type="text"
+            id="messageInput"
+            placeholder="Type a message..."
+            autocomplete="off"
+            required
+          />
+          <button type="submit">Send</button>
+        </form>
+      </main>
+    </div>
+
+    <script src="/socket.io/socket.io.js"></script>
+    <script src="/js/client.js"></script>
+  </body>
+</html>
diff --git a/public/js/client.js b/public/js/client.js
new file mode 100644
index 000000000..a05c6c154
--- /dev/null
+++ b/public/js/client.js
@@ -0,0 +1,280 @@
+'use strict';
+
+/* eslint-disable no-undef */
+const socket = io();
+
+// DOM Elements
+const usernameModal = document.getElementById('usernameModal');
+const usernameForm = document.getElementById('usernameForm');
+const usernameInput = document.getElementById('usernameInput');
+const chatApp = document.getElementById('chatApp');
+const currentUserEl = document.getElementById('currentUser');
+
+const roomList = document.getElementById('roomList');
+const createRoomBtn = document.getElementById('createRoomBtn');
+const roomNameEl = document.getElementById('roomName');
+const renameRoomBtn = document.getElementById('renameRoomBtn');
+const deleteRoomBtn = document.getElementById('deleteRoomBtn');
+
+const messagesContainer = document.getElementById('messagesContainer');
+const messagesList = document.getElementById('messagesList');
+const messageForm = document.getElementById('messageForm');
+const messageInput = document.getElementById('messageInput');
+
+// State
+let username = localStorage.getItem('username');
+let currentRoomId = null;
+const DEFAULT_ROOM_ID = 'general';
+
+// ===== Username Handling =====
+function initUsername() {
+  if (username) {
+    showChat();
+  } else {
+    usernameModal.classList.remove('hidden');
+    chatApp.classList.add('hidden');
+  }
+}
+
+function showChat() {
+  usernameModal.classList.add('hidden');
+  chatApp.classList.remove('hidden');
+  currentUserEl.textContent = username;
+  socket.emit('user:set', username);
+
+  // Auto-join General room
+  joinRoom(DEFAULT_ROOM_ID);
+}
+
+usernameForm.addEventListener('submit', (e) => {
+  e.preventDefault();
+
+  const name = usernameInput.value.trim();
+
+  if (name.length < 2) {
+    return;
+  }
+
+  username = name;
+  localStorage.setItem('username', username);
+  showChat();
+});
+
+// ===== Room Handling =====
+function renderRoomList(rooms) {
+  roomList.innerHTML = '';
+
+  rooms.forEach((room) => {
+    const li = document.createElement('li');
+
+    li.textContent = room.name;
+    li.dataset.roomId = room.id;
+
+    if (room.id === currentRoomId) {
+      li.classList.add('active');
+    }
+
+    li.addEventListener('click', () => joinRoom(room.id));
+    roomList.appendChild(li);
+  });
+}
+
+function joinRoom(roomId) {
+  currentRoomId = roomId;
+  socket.emit('room:join', roomId);
+  messageForm.classList.remove('hidden');
+  messageInput.focus();
+
+  // Update active state in sidebar
+  document.querySelectorAll('.room-list li').forEach((li) => {
+    li.classList.toggle('active', li.dataset.roomId === roomId);
+  });
+
+  // Show/hide room action buttons (hide for General)
+  const isDefault = roomId === DEFAULT_ROOM_ID;
+
+  renameRoomBtn.classList.toggle('hidden', isDefault);
+  deleteRoomBtn.classList.toggle('hidden', isDefault);
+}
+
+createRoomBtn.addEventListener('click', () => {
+  const name = prompt('Enter room name:');
+
+  if (name && name.trim()) {
+    socket.emit('room:create', name.trim());
+  }
+});
+
+renameRoomBtn.addEventListener('click', () => {
+  const newName = prompt('Enter new room name:');
+
+  if (newName && newName.trim()) {
+    socket.emit('room:rename', {
+      roomId: currentRoomId,
+      newName: newName.trim(),
+    });
+  }
+});
+
+deleteRoomBtn.addEventListener('click', () => {
+  const confirmed = confirm(
+    'Are you sure you want to delete this room? All messages will be lost.',
+  );
+
+  if (confirmed) {
+    socket.emit('room:delete', currentRoomId);
+  }
+});
+
+// ===== Message Handling =====
+function formatTime(isoString) {
+  const date = new Date(isoString);
+  const hours = date.getHours().toString().padStart(2, '0');
+  const minutes = date.getMinutes().toString().padStart(2, '0');
+
+  return `${hours}:${minutes}`;
+}
+
+function createMessageElement(message) {
+  const div = document.createElement('div');
+
+  div.classList.add('message');
+
+  div.innerHTML = `
+    <div class="message-header">
+      <span class="message-author">${escapeHtml(message.author)}</span>
+      <span class="message-time">${formatTime(message.time)}</span>
+    </div>
+    <div class="message-text">${escapeHtml(message.text)}</div>
+  `;
+
+  return div;
+}
+
+function createSystemMessage(text) {
+  const div = document.createElement('div');
+
+  div.classList.add('system-message');
+  div.textContent = text;
+
+  return div;
+}
+
+function scrollToBottom() {
+  messagesContainer.scrollTop = messagesContainer.scrollHeight;
+}
+
+function escapeHtml(text) {
+  const div = document.createElement('div');
+
+  div.textContent = text;
+
+  return div.innerHTML;
+}
+
+messageForm.addEventListener('submit', (e) => {
+  e.preventDefault();
+
+  const text = messageInput.value.trim();
+
+  if (!text) {
+    return;
+  }
+
+  socket.emit('message:send', { text });
+  messageInput.value = '';
+  messageInput.focus();
+});
+
+// ===== Socket Event Listeners =====
+
+// Receive room list
+socket.on('room:list', (rooms) => {
+  renderRoomList(rooms);
+});
+
+// Receive message history when joining a room
+socket.on('room:history', (data) => {
+  const { roomId, messages } = data;
+
+  if (roomId !== currentRoomId) {
+    return;
+  }
+
+  // Update room name in header
+  const roomItems = document.querySelectorAll('.room-list li');
+
+  roomItems.forEach((li) => {
+    if (li.dataset.roomId === roomId) {
+      roomNameEl.textContent = li.textContent;
+    }
+  });
+
+  messagesList.innerHTML = '';
+
+  messages.forEach((msg) => {
+    messagesList.appendChild(createMessageElement(msg));
+  });
+
+  scrollToBottom();
+});
+
+// Receive new message
+socket.on('message:new', (data) => {
+  const { roomId, message } = data;
+
+  if (roomId !== currentRoomId) {
+    return;
+  }
+
+  messagesList.appendChild(createMessageElement(message));
+  scrollToBottom();
+});
+
+// Room created
+socket.on('room:created', (room) => {
+  joinRoom(room.id);
+});
+
+// Room renamed
+socket.on('room:renamed', (room) => {
+  if (room.id === currentRoomId) {
+    roomNameEl.textContent = room.name;
+  }
+});
+
+// Room deleted
+socket.on('room:deleted', (data) => {
+  if (data.roomId === currentRoomId) {
+    currentRoomId = DEFAULT_ROOM_ID;
+    joinRoom(DEFAULT_ROOM_ID);
+  }
+});
+
+// User joined notification
+socket.on('room:userJoined', (data) => {
+  if (data.roomId === currentRoomId && data.username !== username) {
+    messagesList.appendChild(
+      createSystemMessage(`${data.username} joined the room`),
+    );
+    scrollToBottom();
+  }
+});
+
+// User left notification
+socket.on('room:userLeft', (data) => {
+  if (data.roomId === currentRoomId) {
+    messagesList.appendChild(
+      createSystemMessage(`${data.username} left the room`),
+    );
+    scrollToBottom();
+  }
+});
+
+// Error messages
+socket.on('error:message', (msg) => {
+  alert(msg);
+});
+
+// ===== Initialize =====
+initUsername();
diff --git a/src/controllers/socketController.js b/src/controllers/socketController.js
new file mode 100644
index 000000000..89d74d047
--- /dev/null
+++ b/src/controllers/socketController.js
@@ -0,0 +1,146 @@
+'use strict';
+
+const store = require('../store');
+
+function registerSocketHandlers(io) {
+  io.on('connection', (socket) => {
+    let username = null;
+    let currentRoom = null;
+
+    // Send the list of rooms to the newly connected client
+    socket.emit('room:list', store.getRooms());
+
+    // User sets their username
+    socket.on('user:set', (name) => {
+      username = name;
+    });
+
+    // User joins a room
+    socket.on('room:join', (roomId) => {
+      const room = store.getRoom(roomId);
+
+      if (!room) {
+        socket.emit('error:message', 'Room not found');
+
+        return;
+      }
+
+      // Leave previous room if any
+      if (currentRoom) {
+        socket.leave(currentRoom);
+      }
+
+      currentRoom = roomId;
+      socket.join(roomId);
+
+      // Send message history to the user
+      socket.emit('room:history', {
+        roomId,
+        messages: store.getRoomMessages(roomId),
+      });
+
+      // Notify room members
+      io.to(roomId).emit('room:userJoined', {
+        roomId,
+        username,
+      });
+    });
+
+    // User sends a message
+    socket.on('message:send', (data) => {
+      const { text } = data;
+
+      if (!currentRoom || !username || !text) {
+        return;
+      }
+
+      const message = store.addMessage(currentRoom, username, text);
+
+      if (message) {
+        io.to(currentRoom).emit('message:new', {
+          roomId: currentRoom,
+          message,
+        });
+      }
+    });
+
+    // Create a new room
+    socket.on('room:create', (name) => {
+      if (!name || !name.trim()) {
+        socket.emit('error:message', 'Room name cannot be empty');
+
+        return;
+      }
+
+      const room = store.createRoom(name.trim());
+
+      // Broadcast updated room list to all clients
+      io.emit('room:list', store.getRooms());
+      io.emit('room:created', room);
+    });
+
+    // Rename a room
+    socket.on('room:rename', (data) => {
+      const { roomId, newName } = data;
+
+      if (!newName || !newName.trim()) {
+        socket.emit('error:message', 'Room name cannot be empty');
+
+        return;
+      }
+
+      if (roomId === store.DEFAULT_ROOM_ID) {
+        socket.emit('error:message', 'Cannot rename the default room');
+
+        return;
+      }
+
+      const room = store.renameRoom(roomId, newName.trim());
+
+      if (!room) {
+        socket.emit('error:message', 'Room not found');
+
+        return;
+      }
+
+      io.emit('room:list', store.getRooms());
+      io.emit('room:renamed', room);
+    });
+
+    // Delete a room
+    socket.on('room:delete', (roomId) => {
+      if (roomId === store.DEFAULT_ROOM_ID) {
+        socket.emit('error:message', 'Cannot delete the default room');
+
+        return;
+      }
+
+      const deleted = store.deleteRoom(roomId);
+
+      if (!deleted) {
+        socket.emit('error:message', 'Room not found');
+
+        return;
+      }
+
+      // Notify clients in the deleted room so they re-join General
+      // This ensures each socket's currentRoom state is properly updated
+      // via the room:join handler on both client and server
+      io.to(roomId).emit('room:deleted', { roomId });
+
+      io.emit('room:list', store.getRooms());
+    });
+
+    // Handle disconnection
+    socket.on('disconnect', () => {
+      if (currentRoom && username) {
+        io.to(currentRoom).emit('room:userLeft', {
+          roomId: currentRoom,
+          username,
+        });
+      }
+    });
+  });
+}
+
+module.exports = { registerSocketHandlers };
diff --git a/src/index.js b/src/index.js
index ad9a93a7c..b9bcf6f18 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1 +1,24 @@
 'use strict';
+
+const express = require('express');
+const http = require('http');
+const path = require('path');
+const { Server } = require('socket.io');
+const { registerSocketHandlers } = require('./controllers/socketController');
+
+const PORT = process.env.PORT || 3000;
+
+const app = express();
+const server = http.createServer(app);
+const io = new Server(server);
+
+// Serve static files from public directory
+app.use(express.static(path.join(__dirname, '..', 'public')));
+
+// Register socket event handlers
+registerSocketHandlers(io);
+
+server.listen(PORT, () => {
+  // eslint-disable-next-line no-console
+  console.log(`Chat server running on http://localhost:${PORT}`);
+});
diff --git a/src/store.js b/src/store.js
new file mode 100644
index 000000000..a36148013
--- /dev/null
+++ b/src/store.js
@@ -0,0 +1,91 @@
+'use strict';
+
+const { v4: uuidv4 } = require('./utils/uuid');
+
+const rooms = new Map();
+
+const DEFAULT_ROOM_ID = 'general';
+
+// Initialize with default room
+rooms.set(DEFAULT_ROOM_ID, {
+  id: DEFAULT_ROOM_ID,
+  name: 'General',
+  messages: [],
+});
+
+function getRooms() {
+  return Array.from(rooms.values()).map(({ id, name }) => ({ id, name }));
+}
+
+function getRoom(roomId) {
+  return rooms.get(roomId) || null;
+}
+
+function createRoom(name) {
+  const id = uuidv4();
+
+  const room = {
+    id,
+    name,
+    messages: [],
+  };
+
+  rooms.set(id, room);
+
+  return { id, name };
+}
+
+function renameRoom(roomId, newName) {
+  const room = rooms.get(roomId);
+
+  if (!room) {
+    return null;
+  }
+
+  room.name = newName;
+
+  return { id: room.id, name: room.name };
+}
+
+function deleteRoom(roomId) {
+  if (roomId === DEFAULT_ROOM_ID) {
+    return false;
+  }
+
+  return rooms.delete(roomId);
+}
+
+function getRoomMessages(roomId) {
+  const room = rooms.get(roomId);
+
+  return room ? room.messages : [];
+}
+
+function addMessage(roomId, author, text) {
+  const room = rooms.get(roomId);
+
+  if (!room) {
+    return null;
+  }
+
+  const message = {
+    author,
+    text,
+    time: new Date().toISOString(),
+  };
+
+  room.messages.push(message);
+
+  return message;
+}
+
+module.exports = {
+  DEFAULT_ROOM_ID,
+  getRooms,
+  getRoom,
+  createRoom,
+  renameRoom,
+  deleteRoom,
+  getRoomMessages,
+  addMessage,
+};
diff --git a/src/utils/uuid.js b/src/utils/uuid.js
new file mode 100644
index 000000000..d6d026998
--- /dev/null
+++ b/src/utils/uuid.js
@@ -0,0 +1,13 @@
+'use strict';
+
+// Simple UUID v4 generator (no external dependency needed)
+function uuidv4() {
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
+    const r = (Math.random() * 16) | 0;
+    const v = c === 'x' ? r : (r & 0x3) | 0x8;
+
+    return v.toString(16);
+  });
+}
+
+module.exports = { v4: uuidv4 };