diff --git a/labs/04/lang/en/en.json b/labs/04/lang/en/en.json
new file mode 100644
index 0000000..e9660bb
--- /dev/null
+++ b/labs/04/lang/en/en.json
@@ -0,0 +1,3 @@
+{
+	"greeting": "Hello %1, What a beautiful day. Server current date and time is %2"
+}
diff --git a/labs/04/modules/fileManager.js b/labs/04/modules/fileManager.js
new file mode 100644
index 0000000..4fa346f
--- /dev/null
+++ b/labs/04/modules/fileManager.js
@@ -0,0 +1,26 @@
+const fs = require("fs");
+const path = require("path");
+
+class FileManager {
+	constructor(baseDir) {
+		this.baseDir = baseDir;
+	}
+
+	resolve(fileName) {
+		return path.join(this.baseDir, path.basename(fileName));
+	}
+
+	exists(fileName) {
+		return fs.existsSync(this.resolve(fileName));
+	}
+
+	append(fileName, text) {
+		fs.appendFileSync(this.resolve(fileName), `${text}\n`);
+	}
+
+	read(fileName) {
+		return fs.readFileSync(this.resolve(fileName), "utf8");
+	}
+}
+
+module.exports = FileManager;
diff --git a/labs/04/modules/math.js b/labs/04/modules/math.js
new file mode 100644
index 0000000..8e3dbfc
--- /dev/null
+++ b/labs/04/modules/math.js
@@ -0,0 +1,13 @@
+const PI = 3.141592654;
+
+exports.add = (a, b) => {
+	return a + b
+}
+
+exports.subtract = (a, b) => {
+	return a - b
+}
+
+exports.area = (r) => {
+	return 2*PI*r;
+}
diff --git a/labs/04/modules/utils.js b/labs/04/modules/utils.js
new file mode 100644
index 0000000..da493f9
--- /dev/null
+++ b/labs/04/modules/utils.js
@@ -0,0 +1,19 @@
+class Utils {
+	getDate() {
+		return new Date().toString();
+	}
+
+	format(template, ...values) {
+		return template.replace(/%(\d+)/g, (match, index) => {
+			const value = values[Number(index) - 1];
+			return value === undefined ? match : value;
+		});
+	}
+
+	escapeHtml(text) {
+		const entities = {"&": "&amp;", "<": "&lt;", ">": "&gt;", "\"": "&quot;", "'": "&#39;"};
+		return text.replace(/[&<>"']/g, (char) => entities[char]);
+	}
+}
+
+module.exports = Utils;
diff --git a/labs/04/server.js b/labs/04/server.js
new file mode 100644
index 0000000..25aee53
--- /dev/null
+++ b/labs/04/server.js
@@ -0,0 +1,89 @@
+const http = require("http");
+const fs = require("fs");
+const path = require("path");
+const Utils = require("./modules/utils");
+const FileManager = require("./modules/fileManager");
+
+const PORT = process.env.PORT || 8000;
+
+class Server {
+	constructor(port) {
+		this.port = port;
+		this.utils = new Utils();
+		this.files = new FileManager(__dirname);
+		this.strings = JSON.parse(fs.readFileSync(path.join(__dirname, "lang", "en", "en.json"), "utf8"));
+	}
+
+	start() {
+		http.createServer((req, res) => this.handleRequest(req, res)).listen(this.port, () => {
+			console.log(`listening on port :${this.port}`);
+		});
+	}
+
+	handleRequest(req, res) {
+		if (req.method !== "GET") {
+			return this.send(res, 405, "text/plain", "Method not allowed");
+		}
+
+		const url = new URL(req.url, "http://localhost");
+
+		try {
+			if (url.pathname === "/") {
+				return this.send(res, 200, "text/plain", "Server Status: OK");
+			}
+			if (/\/getDate\/?$/.test(url.pathname)) {
+				return this.handleGetDate(url, res);
+			}
+			if (/\/writeFile\/?$/.test(url.pathname)) {
+				return this.handleWriteFile(url, res);
+			}
+			const readMatch = url.pathname.match(/\/readFile\/(.+)$/);
+			if (readMatch) {
+				return this.handleReadFile(decodeURIComponent(readMatch[1]), res);
+			}
+			return this.send(res, 404, "text/plain", "Not found");
+		} catch (err) {
+			return this.send(res, 500, "text/plain", `Server error: ${err.message}`);
+		}
+	}
+
+	handleGetDate(url, res) {
+		const name = url.searchParams.get("name");
+		if (!name) {
+			return this.send(res, 400, "text/plain", "Missing required query parameter: name");
+		}
+
+		const message = this.utils.format(
+			this.strings.greeting,
+			this.utils.escapeHtml(name),
+			this.utils.getDate()
+		);
+		const html = `<!DOCTYPE html><html><body><p style="color: blue;">${message}</p></body></html>`;
+		return this.send(res, 200, "text/html", html);
+	}
+
+	handleWriteFile(url, res) {
+		const text = url.searchParams.get("text");
+		if (text === null) {
+			return this.send(res, 400, "text/plain", "Missing required query parameter: text");
+		}
+
+		this.files.append("file.txt", text);
+		return this.send(res, 200, "text/plain", `Appended a new line to file.txt`);
+	}
+
+	handleReadFile(fileName, res) {
+		if (!this.files.exists(fileName)) {
+			return this.send(res, 404, "text/plain", `File not found: ${fileName}`);
+		}
+
+		return this.send(res, 200, "text/plain; charset=utf-8", this.files.read(fileName));
+	}
+
+	send(res, status, contentType, body) {
+		res.writeHead(status, {"Content-Type": contentType});
+		res.end(body);
+	}
+}
+
+new Server(PORT).start();
diff --git a/labs/04/testModule.js b/labs/04/testModule.js
new file mode 100644
index 0000000..c840ae5
--- /dev/null
+++ b/labs/04/testModule.js
@@ -0,0 +1,2 @@
+const mo = require("./modules/math");
+console.log(`Hello Braeden. The area is ${mo.area(r)}`);