diff --git a/src/createServer.js b/src/createServer.js
index 1cf1dda..ed84031 100644
--- a/src/createServer.js
+++ b/src/createServer.js
@@ -1,8 +1,74 @@
 'use strict';
+/* eslint-disable no-console */
+
+const { Server } = require('node:http');
+const fs = require('node:fs');
 
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
+  const server = new Server();
+
+  server.on('request', async (req, res) => {
+    const url = req.url;
+    const method = req.method;
+
+    const template = fs.readFileSync('public/index.html', 'utf-8');
+    const dbData = fs.readFileSync('db/expense.json', 'utf-8');
+
+    if (method === 'GET' && url === '/') {
+      res.statusCode = 200;
+      res.setHeader('Content-Type', 'text/html; charset=utf-8');
+
+      const formattedJson = JSON.stringify(JSON.parse(dbData), null, 2);
+      const html = template.replace('{{jsonData}}', formattedJson);
+
+      return res.end(html);
+    } else if (method === 'POST' && url === '/add-expense') {
+      let body = '';
+
+      req.on('data', (chunk) => {
+        body += chunk;
+      });
+
+      req.on('end', () => {
+        const contentType = req.headers['content-type'];
+        let expense;
+
+        if (contentType === 'application/json') {
+          expense = JSON.parse(body);
+        } else {
+          const params = new URLSearchParams(body);
+
+          expense = {
+            date: params.get('date'),
+            title: params.get('title'),
+            amount: params.get('amount'),
+          };
+        }
+
+        if (!expense.date || !expense.title || !expense.amount) {
+          res.statusCode = 400;
+
+          return res.end('Missing parameters');
+        }
+
+        const jsonData = JSON.stringify(expense, null, 2);
+
+        res.statusCode = 200;
+        res.setHeader('Content-Type', 'text/html; charset=utf-8');
+
+        fs.writeFileSync('db/expense.json', jsonData);
+
+        const newHtml = template.replace('{{jsonData}}', jsonData);
+
+        res.end(newHtml);
+      });
+    } else {
+      res.statusCode = 404;
+      res.end();
+    }
+  });
+
+  return server;
 }
 
 module.exports = {