diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..85c8b42d
--- /dev/null
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new file mode 100644
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+ "statuses": "^2.0.2"
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+ },
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+ "license": "MIT",
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+ }
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+ "version": "1.1.2",
+ "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
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+ "license": "MIT",
+ "engines": {
+ "node": ">= 0.8"
+ }
+ },
+ "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==",
+ "license": "ISC"
+ }
+ }
+}
diff --git a/chat-app/backend/package.json b/chat-app/backend/package.json
new file mode 100644
index 00000000..175e11b1
--- /dev/null
+++ b/chat-app/backend/package.json
@@ -0,0 +1,17 @@
+{
+ "name": "backend",
+ "version": "1.0.0",
+ "description": "",
+ "main": "server.js",
+ "scripts": {
+ "start": "node server.js"
+ },
+ "keywords": [],
+ "author": "",
+ "license": "ISC",
+ "type": "commonjs",
+ "dependencies": {
+ "cors": "^2.8.6",
+ "express": "^5.2.1"
+ }
+}
\ No newline at end of file
diff --git a/chat-app/backend/server.js b/chat-app/backend/server.js
new file mode 100644
index 00000000..7156329f
--- /dev/null
+++ b/chat-app/backend/server.js
@@ -0,0 +1,44 @@
+const express = require("express");
+const cors = require("cors");
+
+const app = express();
+const PORT = 3000;
+
+app.use(cors());
+app.use(express.json());
+
+const messages = [
+ {
+ username: "System",
+ message: "Welcome to Onur's Chat App!",
+ timestamp: Date.now(),
+ },
+];
+
+app.get("/messages", (req, res) => {
+ res.json(messages);
+});
+
+app.post("/messages", (req, res) => {
+ const { username, message } = req.body;
+
+ if (!username.trim() || !message.trim()) {
+ return res.status(400).json({
+ error: "Username and message cannot be empty.",
+ });
+ }
+
+ const newMessage = {
+ username: username.trim(),
+ message: message.trim(),
+ timestamp: Date.now(),
+ };
+
+ messages.push(newMessage);
+
+ res.json({ success: true });
+});
+
+app.listen(PORT, () => {
+ console.log(`Chat server running on port ${PORT}`);
+});
\ No newline at end of file
diff --git a/chat-app/frontend/index.html b/chat-app/frontend/index.html
new file mode 100644
index 00000000..cc205af3
--- /dev/null
+++ b/chat-app/frontend/index.html
@@ -0,0 +1,46 @@
+
+
+
+
+
+ Onur's Chat App
+
+
+
+
+
+
+
💬 Onur's Chat App
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/chat-app/frontend/script.js b/chat-app/frontend/script.js
new file mode 100644
index 00000000..4e222904
--- /dev/null
+++ b/chat-app/frontend/script.js
@@ -0,0 +1,63 @@
+const server = "https://gziswcuniy8wailsojnj6aki.hosting.codeyourfuture.io";
+
+const messagesDiv = document.getElementById("messages");
+const form = document.getElementById("chat-form");
+const usernameInput = document.getElementById("username");
+const messageInput = document.getElementById("message");
+const status = document.getElementById("status");
+
+async function loadMessages() {
+ const response = await fetch(`${server}/messages`);
+ const messages = await response.json();
+
+ messagesDiv.innerHTML = "";
+
+ for (const message of messages) {
+ const p = document.createElement("p");
+
+ const time = new Date(message.timestamp).toLocaleTimeString();
+
+ p.innerHTML = `${message.username} ${time}
${message.message}`;
+
+ messagesDiv.appendChild(p);
+ }
+
+ messagesDiv.scrollTop = messagesDiv.scrollHeight;
+}
+
+form.addEventListener("submit", async (event) => {
+ event.preventDefault();
+
+ try {
+ const response = await fetch(`${server}/messages`, {
+ method: "POST",
+ headers: {
+ "Content-Type": "application/json",
+ },
+ body: JSON.stringify({
+ username: usernameInput.value,
+ message: messageInput.value,
+ }),
+ });
+
+ const result = await response.json();
+
+ if (!response.ok) {
+ throw new Error(result.error);
+ }
+
+ status.textContent = "Message sent!";
+ status.style.color = "green";
+
+ messageInput.value = "";
+
+ loadMessages();
+ } catch (error) {
+ status.textContent = error.message;
+ status.style.color = "red";
+ }
+});
+
+loadMessages();
+
+setInterval(loadMessages, 1000);
\ No newline at end of file
diff --git a/chat-app/frontend/style.css b/chat-app/frontend/style.css
new file mode 100644
index 00000000..c2904245
--- /dev/null
+++ b/chat-app/frontend/style.css
@@ -0,0 +1,84 @@
+body {
+ margin: 0;
+ padding: 0;
+ font-family: Arial, Helvetica, sans-serif;
+ background: #eef2f7;
+}
+
+.container {
+ max-width: 750px;
+ margin: 40px auto;
+ background: white;
+ padding: 30px;
+ border-radius: 12px;
+ box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
+}
+
+h1 {
+ text-align: center;
+ color: #2c3e50;
+ margin-bottom: 30px;
+}
+
+#messages {
+ height: 350px;
+ overflow-y: auto;
+ border: 1px solid #ddd;
+ border-radius: 8px;
+ background: #fafafa;
+ padding: 15px;
+ margin-bottom: 20px;
+}
+
+#messages p {
+ margin: 0 0 12px;
+ padding: 12px;
+ background: white;
+ border-radius: 8px;
+ border-left: 4px solid #3498db;
+ box-shadow: 0 2px 5px rgba(0, 0, 0, 0.08);
+}
+
+form {
+ display: flex;
+ gap: 10px;
+}
+
+input {
+ flex: 1;
+ padding: 12px;
+ border: 1px solid #ccc;
+ border-radius: 6px;
+ font-size: 15px;
+}
+
+input:focus {
+ outline: none;
+ border-color: #3498db;
+}
+
+button {
+ background: #3498db;
+ color: white;
+ border: none;
+ padding: 12px 20px;
+ border-radius: 6px;
+ cursor: pointer;
+ font-size: 15px;
+}
+
+button:hover {
+ background: #2980b9;
+}
+
+#status {
+ margin-top: 15px;
+ text-align: center;
+ font-weight: bold;
+ min-height: 20px;
+}
+
+small {
+ color: #777;
+ margin-left: 8px;
+}
\ No newline at end of file
diff --git a/middleware-custom/package-lock.json b/middleware-custom/package-lock.json
new file mode 100644
index 00000000..ef38481c
--- /dev/null
+++ b/middleware-custom/package-lock.json
@@ -0,0 +1,862 @@
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+ "lockfileVersion": 3,
+ "requires": true,
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+ "": {
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+ "license": "MIT",
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+ "version": "1.0.2",
+ "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
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+ }
+ }
+}
diff --git a/middleware-custom/package.json b/middleware-custom/package.json
new file mode 100644
index 00000000..f31b1f4f
--- /dev/null
+++ b/middleware-custom/package.json
@@ -0,0 +1,16 @@
+{
+ "name": "middleware-custom",
+ "version": "1.0.0",
+ "description": "",
+ "main": "server.js",
+ "scripts": {
+ "start": "node server.js"
+ },
+ "keywords": [],
+ "author": "",
+ "license": "ISC",
+ "type": "commonjs",
+ "dependencies": {
+ "express": "^5.2.1"
+ }
+}
\ No newline at end of file
diff --git a/middleware-custom/server.js b/middleware-custom/server.js
new file mode 100644
index 00000000..32d67864
--- /dev/null
+++ b/middleware-custom/server.js
@@ -0,0 +1,63 @@
+const express = require("express");
+
+const app = express();
+const PORT = 3000;
+
+function usernameMiddleware(req, res, next) {
+ req.username = req.header("X-Username") || null;
+ next();
+}
+
+function jsonArrayMiddleware(req, res, next) {
+ let body = "";
+
+ req.on("data", (chunk) => {
+ body += chunk;
+ });
+
+ req.on("end", () => {
+ try {
+ const parsed = JSON.parse(body);
+
+ if (!Array.isArray(parsed)) {
+ return res.status(400).send("Body must be a JSON array.");
+ }
+
+ if (!parsed.every((item) => typeof item === "string")) {
+ return res.status(400).send("Array must contain only strings.");
+ }
+
+ req.body = parsed;
+ next();
+ } catch {
+ res.status(400).send("Invalid JSON.");
+ }
+ });
+}
+
+app.use(usernameMiddleware);
+
+app.post("/", jsonArrayMiddleware, (req, res) => {
+ const username = req.username;
+ const subjects = req.body;
+
+ const authMessage = username
+ ? `You are authenticated as ${username}.`
+ : "You are not authenticated.";
+
+ let subjectMessage;
+
+ if (subjects.length === 0) {
+ subjectMessage = "You have requested information about 0 subjects.";
+ } else if (subjects.length === 1) {
+ subjectMessage = `You have requested information about 1 subject: ${subjects[0]}.`;
+ } else {
+ subjectMessage = `You have requested information about ${subjects.length} subjects: ${subjects.join(", ")}.`;
+ }
+
+ res.send(`${authMessage}\n\n${subjectMessage}`);
+});
+
+app.listen(PORT, () => {
+ console.log(`Server running on port ${PORT}`);
+});
\ No newline at end of file
diff --git a/middleware-express/package-lock.json b/middleware-express/package-lock.json
new file mode 100644
index 00000000..5b8bf7aa
--- /dev/null
+++ b/middleware-express/package-lock.json
@@ -0,0 +1,862 @@
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+ "license": "MIT",
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+}
diff --git a/middleware-express/package.json b/middleware-express/package.json
new file mode 100644
index 00000000..3c90f2f8
--- /dev/null
+++ b/middleware-express/package.json
@@ -0,0 +1,16 @@
+{
+ "name": "middleware-express",
+ "version": "1.0.0",
+ "description": "",
+ "main": "server.js",
+ "scripts": {
+ "start": "node server.js"
+ },
+ "keywords": [],
+ "author": "",
+ "license": "ISC",
+ "type": "commonjs",
+ "dependencies": {
+ "express": "^5.2.1"
+ }
+}
\ No newline at end of file
diff --git a/middleware-express/server.js b/middleware-express/server.js
new file mode 100644
index 00000000..74d27dae
--- /dev/null
+++ b/middleware-express/server.js
@@ -0,0 +1,52 @@
+const express = require("express");
+
+const app = express();
+const PORT = 3000;
+
+app.use(express.json());
+
+function usernameMiddleware(req, res, next) {
+ req.username = req.header("X-Username") || null;
+ next();
+}
+
+function validateArrayMiddleware(req, res, next) {
+ const body = req.body;
+
+ if (!Array.isArray(body)) {
+ return res.status(400).send("Body must be a JSON array.");
+ }
+
+ if (!body.every((item) => typeof item === "string")) {
+ return res.status(400).send("Array must contain only strings.");
+ }
+
+ next();
+}
+
+app.use(usernameMiddleware);
+
+app.post("/", validateArrayMiddleware, (req, res) => {
+ const username = req.username;
+ const subjects = req.body;
+
+ const authMessage = username
+ ? `You are authenticated as ${username}.`
+ : "You are not authenticated.";
+
+ let subjectMessage;
+
+ if (subjects.length === 0) {
+ subjectMessage = "You have requested information about 0 subjects.";
+ } else if (subjects.length === 1) {
+ subjectMessage = `You have requested information about 1 subject: ${subjects[0]}.`;
+ } else {
+ subjectMessage = `You have requested information about ${subjects.length} subjects: ${subjects.join(", ")}.`;
+ }
+
+ res.send(`${authMessage}\n\n${subjectMessage}`);
+});
+
+app.listen(PORT, () => {
+ console.log(`Server running on port ${PORT}`);
+});
\ No newline at end of file