From 9711d2bc1be752852f4f149c9b6607a65373812a Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Tue, 19 May 2026 23:36:53 +0200
Subject: [PATCH 01/15] setup backend chat server

---
 chat-app/backend/package-lock.json | 871 +++++++++++++++++++++++++++++
 chat-app/backend/package.json      |  17 +
 chat-app/backend/server.js         |  30 +
 3 files changed, 918 insertions(+)
 create mode 100644 chat-app/backend/package-lock.json
 create mode 100644 chat-app/backend/package.json
 create mode 100644 chat-app/backend/server.js

diff --git a/chat-app/backend/package-lock.json b/chat-app/backend/package-lock.json
new file mode 100644
index 00000000..11586ec7
--- /dev/null
+++ b/chat-app/backend/package-lock.json
@@ -0,0 +1,871 @@
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+}
diff --git a/chat-app/backend/package.json b/chat-app/backend/package.json
new file mode 100644
index 00000000..45c7a9f8
--- /dev/null
+++ b/chat-app/backend/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "backend",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+  "start": "node server.js"
+},
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "dependencies": {
+    "cors": "^2.8.6",
+    "express": "^5.2.1"
+  }
+}
diff --git a/chat-app/backend/server.js b/chat-app/backend/server.js
new file mode 100644
index 00000000..5b2920e0
--- /dev/null
+++ b/chat-app/backend/server.js
@@ -0,0 +1,30 @@
+const express = require('express');
+const cors = require('cors');
+
+const app = express();
+const PORT = 3000;
+
+app.use(cors());
+app.use(express.json());
+
+const messages = [];
+//To GET all messages
+app.get("/messages", (req, res) => {
+  res.json(messages);
+});
+
+//To POST a new message
+app.post("/messages", (req, res) => {
+  const newMessage = req.body;
+
+  messages.push(newMessage);
+
+  res.status(201).json({
+    success: true,
+    message: "Message added",
+  });
+});
+
+app.listen(PORT, () => {
+  console.log(`Server running on port ${PORT}`);
+});
\ No newline at end of file

From 9d5583f669ab2dd06078d1b562ed48a81da122cb Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Tue, 19 May 2026 23:56:00 +0200
Subject: [PATCH 02/15] create frontend html structure

---
 chat-app/frontend/index.html | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 chat-app/frontend/index.html

diff --git a/chat-app/frontend/index.html b/chat-app/frontend/index.html
new file mode 100644
index 00000000..4a10c96b
--- /dev/null
+++ b/chat-app/frontend/index.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+  <title>CYF Barcelona Live Chat</title>
+  <link rel="stylesheet" href="style.css">
+</head>
+<body>
+
+    <div class="title-container">
+  <h1>CYF Barcelona</h1>
+  <p>Live Chat Application</p>
+</div>
+
+  <form id="message-form">
+    <input type="text" id="username" placeholder="Your name" required />
+    
+    <input type="text" id="message-input" placeholder="Type a message" required />
+    
+    <button type="submit">Send</button>
+  </form>
+
+  <div id="messages"></div>
+
+  <script src="script.js"></script>
+</body>
+</html>
\ No newline at end of file

From da5e010411fcfcd5808416883b442913d32aad63 Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Wed, 20 May 2026 00:15:14 +0200
Subject: [PATCH 03/15] Add frontend fetch logic

---
 chat-app/frontend/script.js | 51 +++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 chat-app/frontend/script.js

diff --git a/chat-app/frontend/script.js b/chat-app/frontend/script.js
new file mode 100644
index 00000000..749ff3e3
--- /dev/null
+++ b/chat-app/frontend/script.js
@@ -0,0 +1,51 @@
+const form = document.getElementById("message-form");
+const messagesDiv = document.getElementById("messages");
+
+const server = "http://localhost:3000";
+
+async function getMessages() {
+  const response = await fetch(`${server}/messages`);
+
+  const messages = await response.json();
+
+  messagesDiv.innerHTML = "";
+
+  messages.forEach((message) => {
+    const div = document.createElement("div");
+
+    div.className = "message";
+
+    div.innerHTML = `
+      <strong>${message.username}</strong>
+      <p>${message.text}</p>
+    `;
+
+    messagesDiv.appendChild(div);
+  });
+}
+
+form.addEventListener("submit", async (event) => {
+  event.preventDefault();
+
+  const username = document.getElementById("username").value;
+  const text = document.getElementById("message-input").value;
+
+  const newMessage = {
+    username,
+    text,
+  };
+
+  await fetch(`${server}/messages`, {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify(newMessage),
+  });
+
+  form.reset();
+
+  getMessages();
+});
+
+getMessages();
\ No newline at end of file

From f038c5ef4a8df9b4eb1268c2a645aba253cbaf19 Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Sat, 23 May 2026 21:49:32 +0200
Subject: [PATCH 04/15] Add chat backend routes

---
 chat-app/backend/server.js | 31 ++++++++++++++++++++++---------
 1 file changed, 22 insertions(+), 9 deletions(-)

diff --git a/chat-app/backend/server.js b/chat-app/backend/server.js
index 5b2920e0..3ec5c81e 100644
--- a/chat-app/backend/server.js
+++ b/chat-app/backend/server.js
@@ -1,5 +1,5 @@
-const express = require('express');
-const cors = require('cors');
+const express = require("express");
+const cors = require("cors");
 
 const app = express();
 const PORT = 3000;
@@ -8,21 +8,34 @@ app.use(cors());
 app.use(express.json());
 
 const messages = [];
-//To GET all messages
+
 app.get("/messages", (req, res) => {
   res.json(messages);
 });
 
-//To POST a new message
 app.post("/messages", (req, res) => {
-  const newMessage = req.body;
+  const newMessage = {
+    id: Date.now(),
+    username: req.body.username,
+    text: req.body.text,
+    likes: 0,
+    dislikes: 0,
+  };
 
   messages.push(newMessage);
+  res.status(201).json(newMessage);
+});
+
+app.post("/messages/:id/like", (req, res) => {
+  const message = messages.find((msg) => msg.id === Number(req.params.id));
+  message.likes += 1;
+  res.json(message);
+});
 
-  res.status(201).json({
-    success: true,
-    message: "Message added",
-  });
+app.post("/messages/:id/dislike", (req, res) => {
+  const message = messages.find((msg) => msg.id === Number(req.params.id));
+  message.dislikes += 1;
+  res.json(message);
 });
 
 app.listen(PORT, () => {

From 6380a9f418b11e32761d64c5a108a92f72a1d5e9 Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Sat, 23 May 2026 21:56:34 +0200
Subject: [PATCH 05/15] Build frontend chat interface

---
 chat-app/frontend/script.js | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/chat-app/frontend/script.js b/chat-app/frontend/script.js
index 749ff3e3..6099ba1d 100644
--- a/chat-app/frontend/script.js
+++ b/chat-app/frontend/script.js
@@ -5,19 +5,19 @@ const server = "http://localhost:3000";
 
 async function getMessages() {
   const response = await fetch(`${server}/messages`);
-
   const messages = await response.json();
 
   messagesDiv.innerHTML = "";
 
   messages.forEach((message) => {
     const div = document.createElement("div");
-
     div.className = "message";
 
     div.innerHTML = `
       <strong>${message.username}</strong>
       <p>${message.text}</p>
+      <button onclick="likeMessage(${message.id})">💗 Like ${message.likes}</button>
+      <button onclick="dislikeMessage(${message.id})">👎 Dislike ${message.dislikes}</button>
     `;
 
     messagesDiv.appendChild(div);
@@ -30,22 +30,32 @@ form.addEventListener("submit", async (event) => {
   const username = document.getElementById("username").value;
   const text = document.getElementById("message-input").value;
 
-  const newMessage = {
-    username,
-    text,
-  };
-
   await fetch(`${server}/messages`, {
     method: "POST",
     headers: {
       "Content-Type": "application/json",
     },
-    body: JSON.stringify(newMessage),
+    body: JSON.stringify({ username, text }),
   });
 
   form.reset();
-
   getMessages();
 });
 
+async function likeMessage(id) {
+  await fetch(`${server}/messages/${id}/like`, {
+    method: "POST",
+  });
+
+  getMessages();
+}
+
+async function dislikeMessage(id) {
+  await fetch(`${server}/messages/${id}/dislike`, {
+    method: "POST",
+  });
+
+  getMessages();
+}
+
 getMessages();
\ No newline at end of file

From 72e02b1a8a58831f5c3fdb2eec82867c5ecc58c8 Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Sat, 23 May 2026 22:16:46 +0200
Subject: [PATCH 06/15] Improve frontend layout and styling

---
 chat-app/.gitignore          |  1 +
 chat-app/frontend/index.html | 28 ++++++++-----
 chat-app/frontend/style.css  | 76 ++++++++++++++++++++++++++++++++++++
 3 files changed, 96 insertions(+), 9 deletions(-)
 create mode 100644 chat-app/.gitignore
 create mode 100644 chat-app/frontend/style.css

diff --git a/chat-app/.gitignore b/chat-app/.gitignore
new file mode 100644
index 00000000..b512c09d
--- /dev/null
+++ b/chat-app/.gitignore
@@ -0,0 +1 @@
+node_modules
\ No newline at end of file
diff --git a/chat-app/frontend/index.html b/chat-app/frontend/index.html
index 4a10c96b..01b8ffc2 100644
--- a/chat-app/frontend/index.html
+++ b/chat-app/frontend/index.html
@@ -6,18 +6,28 @@
   <title>CYF Barcelona Live Chat</title>
   <link rel="stylesheet" href="style.css">
 </head>
-<body>
 
-    <div class="title-container">
-  <h1>CYF Barcelona</h1>
-  <p>Live Chat Application</p>
-</div>
+<body>
+  <div class="title-container">
+    <h1>CYF Barcelona</h1>
+    <p>Live Chat Application</p>
+  </div>
 
   <form id="message-form">
-    <input type="text" id="username" placeholder="Your name" required />
-    
-    <input type="text" id="message-input" placeholder="Type a message" required />
-    
+    <input
+      type="text"
+      id="username"
+      placeholder="Your name"
+      required
+    />
+
+    <input
+      type="text"
+      id="message-input"
+      placeholder="Type a message"
+      required
+    />
+
     <button type="submit">Send</button>
   </form>
 
diff --git a/chat-app/frontend/style.css b/chat-app/frontend/style.css
new file mode 100644
index 00000000..5d1834b8
--- /dev/null
+++ b/chat-app/frontend/style.css
@@ -0,0 +1,76 @@
+body {
+  font-family: Arial, sans-serif;
+  background: linear-gradient(135deg, #ffe4f1, #f7d9ff);
+  min-height: 100vh;
+  margin: 0;
+  padding: 40px;
+}
+
+.title-container {
+  text-align: center;
+  margin-bottom: 30px;
+}
+
+.title-container h1 {
+  font-size: 48px;
+  color: #d63384;
+  margin-bottom: 8px;
+}
+
+.title-container p {
+  font-size: 20px;
+  color: #7b2cbf;
+}
+
+#message-form {
+  background: white;
+  max-width: 600px;
+  margin: 0 auto 30px;
+  padding: 25px;
+  border-radius: 18px;
+  box-shadow: 0 8px 25px rgba(214, 51, 132, 0.2);
+  display: flex;
+  gap: 10px;
+}
+
+input {
+  padding: 12px;
+  border: 1px solid #f3a6c8;
+  border-radius: 10px;
+  flex: 1;
+}
+
+button {
+  background: #d63384;
+  color: white;
+  border: none;
+  padding: 12px 16px;
+  border-radius: 10px;
+  cursor: pointer;
+}
+
+button:hover {
+  background: #b02a6f;
+}
+
+#messages {
+  max-width: 600px;
+  margin: 0 auto;
+}
+
+.message {
+  background: white;
+  padding: 18px;
+  margin-bottom: 15px;
+  border-radius: 16px;
+  box-shadow: 0 6px 18px rgba(123, 44, 191, 0.15);
+}
+
+.message strong {
+  color: #7b2cbf;
+}
+
+.message p {
+  color: #333;
+  font-size: 16px;
+}
\ No newline at end of file

From 6c6e7cd3ea516f0a7338370fa1050c21cda26f3c Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Sat, 23 May 2026 22:36:13 +0200
Subject: [PATCH 07/15] Add automatic live message updates

---
 chat-app/frontend/script.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/chat-app/frontend/script.js b/chat-app/frontend/script.js
index 6099ba1d..6eca291b 100644
--- a/chat-app/frontend/script.js
+++ b/chat-app/frontend/script.js
@@ -58,4 +58,6 @@ async function dislikeMessage(id) {
   getMessages();
 }
 
-getMessages();
\ No newline at end of file
+getMessages();
+
+ setInterval(getMessages, 1000);
\ No newline at end of file

From ec33ae04974a6afbb93df5dae3b30d70cec57d65 Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Sat, 23 May 2026 23:18:34 +0200
Subject: [PATCH 08/15] Improve chat app UI and add live message updates

---
 chat-app/frontend/index.html | 34 +++++----------
 chat-app/frontend/style.css  | 85 ++++++++++++++++++++----------------
 2 files changed, 60 insertions(+), 59 deletions(-)

diff --git a/chat-app/frontend/index.html b/chat-app/frontend/index.html
index 01b8ffc2..c8a48a99 100644
--- a/chat-app/frontend/index.html
+++ b/chat-app/frontend/index.html
@@ -8,30 +8,20 @@
 </head>
 
 <body>
-  <div class="title-container">
-    <h1>CYF Barcelona</h1>
-    <p>Live Chat Application</p>
-  </div>
+  <main class="chat-container">
+    <div class="title-container">
+      <h1>CYF Barcelona</h1>
+      <p>CYF Live Chat App</p>
+    </div>
 
-  <form id="message-form">
-    <input
-      type="text"
-      id="username"
-      placeholder="Your name"
-      required
-    />
+    <div id="messages"></div>
 
-    <input
-      type="text"
-      id="message-input"
-      placeholder="Type a message"
-      required
-    />
-
-    <button type="submit">Send</button>
-  </form>
-
-  <div id="messages"></div>
+    <form id="message-form">
+      <input type="text" id="username" placeholder="Your name" required />
+      <input type="text" id="message-input" placeholder="Type a message" required />
+      <button type="submit">Send</button>
+    </form>
+  </main>
 
   <script src="script.js"></script>
 </body>
diff --git a/chat-app/frontend/style.css b/chat-app/frontend/style.css
index 5d1834b8..2df49ed3 100644
--- a/chat-app/frontend/style.css
+++ b/chat-app/frontend/style.css
@@ -1,76 +1,87 @@
+* {
+  box-sizing: border-box;
+}
+
 body {
   font-family: Arial, sans-serif;
   background: linear-gradient(135deg, #ffe4f1, #f7d9ff);
   min-height: 100vh;
   margin: 0;
   padding: 40px;
+
+  display: flex;
+  justify-content: center;
+  align-items: flex-start;
+}
+
+.chat-container {
+  width: 90%;
+  max-width: 950px;
+  margin-top: 60px;
+  background: white;
+  border-radius: 24px;
+  box-shadow: 0 12px 35px rgba(214, 51, 132, 0.25);
+  overflow: hidden;
 }
 
 .title-container {
   text-align: center;
-  margin-bottom: 30px;
+  padding: 30px 20px;
+  background: #fff0f7;
 }
 
 .title-container h1 {
-  font-size: 48px;
+  font-size: 42px;
   color: #d63384;
-  margin-bottom: 8px;
+  margin: 0 0 8px;
 }
 
 .title-container p {
-  font-size: 20px;
+  font-size: 18px;
   color: #7b2cbf;
+  margin: 0;
 }
 
-#message-form {
-  background: white;
-  max-width: 600px;
-  margin: 0 auto 30px;
+#messages {
   padding: 25px;
-  border-radius: 18px;
-  box-shadow: 0 8px 25px rgba(214, 51, 132, 0.2);
+  min-height: 300px;
+}
+
+.message {
+  background: #fff5fa;
+  border-left: 5px solid #d63384;
+  padding: 16px;
+  margin-bottom: 15px;
+  border-radius: 14px;
+}
+
+.message strong {
+  color: #7b2cbf;
+}
+
+#message-form {
   display: flex;
   gap: 10px;
+  padding: 20px;
+  background: #fff0f7;
 }
 
 input {
-  padding: 12px;
-  border: 1px solid #f3a6c8;
-  border-radius: 10px;
   flex: 1;
+  padding: 13px;
+  border: 1px solid #f3a6c8;
+  border-radius: 12px;
 }
 
 button {
   background: #d63384;
   color: white;
   border: none;
-  padding: 12px 16px;
-  border-radius: 10px;
+  padding: 13px 18px;
+  border-radius: 12px;
   cursor: pointer;
 }
 
 button:hover {
   background: #b02a6f;
-}
-
-#messages {
-  max-width: 600px;
-  margin: 0 auto;
-}
-
-.message {
-  background: white;
-  padding: 18px;
-  margin-bottom: 15px;
-  border-radius: 16px;
-  box-shadow: 0 6px 18px rgba(123, 44, 191, 0.15);
-}
-
-.message strong {
-  color: #7b2cbf;
-}
-
-.message p {
-  color: #333;
-  font-size: 16px;
 }
\ No newline at end of file

From a76f95060c9f770780e6c07d982bef46b304ba0c Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Sat, 23 May 2026 23:36:01 +0200
Subject: [PATCH 09/15] improve frontend styling and add clear button

---
 chat-app/frontend/index.html |  1 +
 chat-app/frontend/script.js  | 11 ++++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/chat-app/frontend/index.html b/chat-app/frontend/index.html
index c8a48a99..b42e846c 100644
--- a/chat-app/frontend/index.html
+++ b/chat-app/frontend/index.html
@@ -20,6 +20,7 @@ <h1>CYF Barcelona</h1>
       <input type="text" id="username" placeholder="Your name" required />
       <input type="text" id="message-input" placeholder="Type a message" required />
       <button type="submit">Send</button>
+      <button type="button" id="clear-btn">Clear Chat</button>
     </form>
   </main>
 
diff --git a/chat-app/frontend/script.js b/chat-app/frontend/script.js
index 6eca291b..3c713861 100644
--- a/chat-app/frontend/script.js
+++ b/chat-app/frontend/script.js
@@ -60,4 +60,13 @@ async function dislikeMessage(id) {
 
 getMessages();
 
- setInterval(getMessages, 1000);
\ No newline at end of file
+ setInterval(getMessages, 1000);
+ const clearButton = document.getElementById("clear-btn");
+
+clearButton.addEventListener("click", async () => {
+  await fetch(`${server}/messages`, {
+    method: "DELETE",
+  });
+
+  getMessages();
+});
\ No newline at end of file

From 91c880c07910d0ed4b87c6b1377c92bc6f1a90d0 Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Sun, 24 May 2026 00:00:06 +0200
Subject: [PATCH 10/15] add clear chat functionality to backend

---
 chat-app/backend/server.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/chat-app/backend/server.js b/chat-app/backend/server.js
index 3ec5c81e..a8716501 100644
--- a/chat-app/backend/server.js
+++ b/chat-app/backend/server.js
@@ -37,6 +37,13 @@ app.post("/messages/:id/dislike", (req, res) => {
   message.dislikes += 1;
   res.json(message);
 });
+app.delete("/messages", (req, res) => {
+  messages.length = 0;
+
+  res.json({
+    success: true,
+  });
+});
 
 app.listen(PORT, () => {
   console.log(`Server running on port ${PORT}`);

From 8226488a8dd41eb52b2837445124e3008953e777 Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Sun, 24 May 2026 18:56:58 +0200
Subject: [PATCH 11/15] Update chat app styling and clear button

---
 chat-app/frontend/style.css | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/chat-app/frontend/style.css b/chat-app/frontend/style.css
index 2df49ed3..583ca375 100644
--- a/chat-app/frontend/style.css
+++ b/chat-app/frontend/style.css
@@ -43,8 +43,8 @@ body {
 }
 
 #messages {
-  padding: 25px;
-  min-height: 300px;
+  padding: 20px;
+  min-height: 500px;
 }
 
 .message {

From fe64f2271c0f432e5d91c809c21a587e17fbb592 Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Sun, 24 May 2026 19:51:27 +0200
Subject: [PATCH 12/15] Add timestamps to chat messages

---
 chat-app/backend/server.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/chat-app/backend/server.js b/chat-app/backend/server.js
index a8716501..dde33867 100644
--- a/chat-app/backend/server.js
+++ b/chat-app/backend/server.js
@@ -20,6 +20,7 @@ app.post("/messages", (req, res) => {
     text: req.body.text,
     likes: 0,
     dislikes: 0,
+    time: new Date().toLocaleTimeString(),
   };
 
   messages.push(newMessage);

From efe3bfad18ae562cbc1cb984db292774bd8ed781 Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Sun, 24 May 2026 20:01:33 +0200
Subject: [PATCH 13/15] Display and style message timestamps

---
 chat-app/frontend/script.js | 1 +
 chat-app/frontend/style.css | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/chat-app/frontend/script.js b/chat-app/frontend/script.js
index 3c713861..00c70488 100644
--- a/chat-app/frontend/script.js
+++ b/chat-app/frontend/script.js
@@ -16,6 +16,7 @@ async function getMessages() {
     div.innerHTML = `
       <strong>${message.username}</strong>
       <p>${message.text}</p>
+      <p class="time">${message.time}</p>
       <button onclick="likeMessage(${message.id})">💗 Like ${message.likes}</button>
       <button onclick="dislikeMessage(${message.id})">👎 Dislike ${message.dislikes}</button>
     `;
diff --git a/chat-app/frontend/style.css b/chat-app/frontend/style.css
index 583ca375..50050f38 100644
--- a/chat-app/frontend/style.css
+++ b/chat-app/frontend/style.css
@@ -84,4 +84,10 @@ button {
 
 button:hover {
   background: #b02a6f;
+}
+
+.time {
+  font-size: 12px;
+  color: gray;
+  text-align: right;
 }
\ No newline at end of file

From 14899cd7d0d2181d86e2686621bc7d8c25d9ca8c Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Sun, 24 May 2026 20:43:28 +0200
Subject: [PATCH 14/15] backend server url

---
 chat-app/frontend/script.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/chat-app/frontend/script.js b/chat-app/frontend/script.js
index 00c70488..658b79e6 100644
--- a/chat-app/frontend/script.js
+++ b/chat-app/frontend/script.js
@@ -1,7 +1,7 @@
 const form = document.getElementById("message-form");
 const messagesDiv = document.getElementById("messages");
 
-const server = "http://localhost:3000";
+const server = "http://zprywrhs4bn9tkoessxlkb93.178.105.39.91.sslip.io";
 
 async function getMessages() {
   const response = await fetch(`${server}/messages`);

From 0df9e1d29c1cc491d851c84ae25a44dc1640372c Mon Sep 17 00:00:00 2001
From: SlimMicheals <slimmicheals77@gmail.com>
Date: Sat, 20 Jun 2026 10:01:55 +0200
Subject: [PATCH 15/15] Add middleware exercises

---
 README.md                                 |  14 +
 custom-middleware/package-lock.json       | 843 ++++++++++++++++++++++
 custom-middleware/package.json            |  11 +
 custom-middleware/server.js               |  62 ++
 express-json-middleware/package-lock.json | 843 ++++++++++++++++++++++
 express-json-middleware/package.json      |  12 +
 express-json-middleware/server.js         |  50 ++
 7 files changed, 1835 insertions(+)
 create mode 100644 custom-middleware/package-lock.json
 create mode 100644 custom-middleware/package.json
 create mode 100644 custom-middleware/server.js
 create mode 100644 express-json-middleware/package-lock.json
 create mode 100644 express-json-middleware/package.json
 create mode 100644 express-json-middleware/server.js

diff --git a/README.md b/README.md
index 2d6b50c3..b0ad77d7 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,17 @@
 # Coursework
 
 Exercises to practice and solidify your understanding of the Decomposition module of the Software Development Course.
+
+custom-middleware/README.md:
+This project uses three custom middlewares:
+
+1. customJsonParser
+2. usernameMiddleware
+3. bodyValidationMiddleware
+
+express-json-middleware/README.md:
+This project replaces the custom JSON parser with Express's built-in:
+
+express.json()
+
+The other two middlewares remain custom.
diff --git a/custom-middleware/package-lock.json b/custom-middleware/package-lock.json
new file mode 100644
index 00000000..01fb6d37
--- /dev/null
+++ b/custom-middleware/package-lock.json
@@ -0,0 +1,843 @@
+{
+  "name": "custom-middleware",
+  "version": "1.0.0",
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+  "requires": true,
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+    "": {
+      "name": "custom-middleware",
+      "version": "1.0.0",
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+      "license": "MIT",
+      "dependencies": {
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+        "negotiator": "^1.0.0"
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+      "engines": {
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+      },
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+        "type": "opencollective",
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+      "license": "ISC"
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+}
diff --git a/custom-middleware/package.json b/custom-middleware/package.json
new file mode 100644
index 00000000..dd6d2156
--- /dev/null
+++ b/custom-middleware/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "custom-middleware",
+  "version": "1.0.0",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "express": "^5.2.1"
+  }
+}
\ No newline at end of file
diff --git a/custom-middleware/server.js b/custom-middleware/server.js
new file mode 100644
index 00000000..f0f832ca
--- /dev/null
+++ b/custom-middleware/server.js
@@ -0,0 +1,62 @@
+const express = require("express");
+
+const app = express();
+const PORT = 3000;
+
+function customJsonParser(req, res, next) {
+  let data = "";
+
+  req.on("data", (chunk) => {
+    data += chunk;
+  });
+
+  req.on("end", () => {
+    try {
+      req.body = JSON.parse(data);
+      next();
+    } catch (error) {
+      res.status(400).send("Invalid JSON");
+    }
+  });
+}
+
+function usernameMiddleware(req, res, next) {
+  req.username = req.get("X-Username") || null;
+  next();
+}
+
+function bodyValidationMiddleware(req, res, next) {
+  if (!Array.isArray(req.body)) {
+    return res.status(400).send("Body must be an array");
+  }
+
+  const allStrings = req.body.every((item) => typeof item === "string");
+
+  if (!allStrings) {
+    return res.status(400).send("All items must be strings");
+  }
+
+  next();
+}
+
+app.use(customJsonParser);
+app.use(usernameMiddleware);
+app.use(bodyValidationMiddleware);
+
+app.post("/", (req, res) => {
+  const usernameMessage = req.username
+    ? `You are authenticated as ${req.username}.`
+    : "You are not authenticated.";
+
+  const subjectsCount = req.body.length;
+  const subjectWord = subjectsCount === 1 ? "subject" : "subjects";
+  const subjectsList = req.body.join(", ");
+
+  res.send(`${usernameMessage}
+
+You have requested information about ${subjectsCount} ${subjectWord}: ${subjectsList}.`);
+});
+
+app.listen(PORT, () => {
+  console.log(`Server running on port ${PORT}`);
+});
\ No newline at end of file
diff --git a/express-json-middleware/package-lock.json b/express-json-middleware/package-lock.json
new file mode 100644
index 00000000..369968f3
--- /dev/null
+++ b/express-json-middleware/package-lock.json
@@ -0,0 +1,843 @@
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+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
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+      "name": "express-json-middleware",
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+      },
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+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
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+    },
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+}
diff --git a/express-json-middleware/package.json b/express-json-middleware/package.json
new file mode 100644
index 00000000..ca429210
--- /dev/null
+++ b/express-json-middleware/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "express-json-middleware",
+  "version": "1.0.0",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "type": "commonjs",
+  "dependencies": {
+    "express": "^5.2.1"
+  }
+}
\ No newline at end of file
diff --git a/express-json-middleware/server.js b/express-json-middleware/server.js
new file mode 100644
index 00000000..45bd1157
--- /dev/null
+++ b/express-json-middleware/server.js
@@ -0,0 +1,50 @@
+const express = require("express");
+
+const app = express();
+const PORT = 3000;
+
+app.use(express.json());
+
+function usernameMiddleware(req, res, next) {
+  req.username = req.get("X-Username") || null;
+  next();
+}
+
+function bodyValidationMiddleware(req, res, next) {
+  if (!Array.isArray(req.body)) {
+    return res.status(400).send("Body must be an array");
+  }
+
+  const allStrings = req.body.every(
+    (item) => typeof item === "string"
+  );
+
+  if (!allStrings) {
+    return res.status(400).send("All items must be strings");
+  }
+
+  next();
+}
+
+app.use(usernameMiddleware);
+app.use(bodyValidationMiddleware);
+
+app.post("/", (req, res) => {
+  const usernameMessage = req.username
+    ? `You are authenticated as ${req.username}.`
+    : "You are not authenticated.";
+
+  const subjectsCount = req.body.length;
+  const subjectWord = subjectsCount === 1 ? "subject" : "subjects";
+  const subjectsList = req.body.join(", ");
+
+  res.send(`
+${usernameMessage}
+
+You have requested information about ${subjectsCount} ${subjectWord}: ${subjectsList}.
+`);
+});
+
+app.listen(PORT, () => {
+  console.log(`Server running on port ${PORT}`);
+});
\ No newline at end of file