diff --git a/index.js b/index.js
index afc6a8bd6c..9e74c4dd85 100644
--- a/index.js
+++ b/index.js
@@ -1,7 +1,25 @@
-const express = require('express')
-const app = express()
-app.all('/', (req, res) => {
-    console.log("Just got a request!")
-    res.send('Yo!')
-})
-app.listen(process.env.PORT || 3000)
\ No newline at end of file
+const http = require('http');
+const url = require('url');
+
+const server = http.createServer((req, res) => {
+
+    req.query = url.parse(req.url, true).query;
+    const radius = req.query.radius;
+
+    if (radius === undefined) {
+        res.statusCode = 400;
+        res.setHeader('Content-Type', 'text/plain');
+        res.end('Nama: Vincent Sompie\nNIM: 210211060120\n\nError: Silahkan memasukkan parameter radius pada request query.\n');
+    } else {
+        const area = Math.PI * radius ** 2;
+        res.statusCode = 200;
+        res.setHeader('Content-Type', 'text/plain');
+        res.end(`Nama: Vincent Sompie\nNIM: 210211060120\n\nLuas lingkaran dengan jari-jari ${radius} adalah ${area}.\n`);
+    }
+});
+
+const PORT = 3000
+
+server.listen(PORT, () => {
+    console.log(`Server up and running at port ${PORT}`);
+});