mate-academy · luchali · Mar 23, 2026 · Mar 24, 2026
diff --git a/src/createServer.js b/src/createServer.js
@@ -1,8 +1,126 @@
 'use strict';
 
+const http = require('http');
+const fs = require('fs');
+const path = require('path');
+const querystring = require('querystring');
+
 function createServer() {
   /* Write your code here */
   // Return instance of http.Server class
+  return http.createServer((req, res) => {
+    if (req.url === '/' && req.method === 'GET') {
+      res.statusCode = 200;
+      res.setHeader('Content-Type', 'text/html');
+
+      res.end(`
+        <html>
+          <head>
+            <title>Expense Form</title>
+          </head>
+          <body>
+            <h2>Add Expense</h2>
+            <form method="POST" action="/submit-expense">
+              <label>Date:</label>
+              <input type="date" name="date" required />
+
+              <label>Title:</label>
+              <input type="text" name="title" placeholder="Title" required />
+
+              <label>Amount:</label>
+              <input type="number" name="amount" placeholder="Amount" required />
+
+              <button type="submit">Submit</button>
+            </form>
+          </body>
+        </html>
+      `);
+    } else if (
+      (req.url === '/submit-expense' || req.url === '/add-expense') &&
+      req.method === 'POST'
+    ) {
+      const chunks = [];
+
+      req.on('data', (chunk) => {
+        chunks.push(chunk);
+      });
+
+      req.on('end', () => {
+        try {
+          const body = Buffer.concat(chunks).toString();
+
+          if (!body) {
+            res.statusCode = 400;
+            res.end('Empty body');
+
+            return;
+          }
+
+          const contentType = req.headers['content-type'] || '';
+          let bodyParsed;
+
+          if (contentType.includes('application/json')) {
+            bodyParsed = JSON.parse(body);
+          } else {
+            bodyParsed = querystring.parse(body);
+          }
+
+          const { date, title, amount } = bodyParsed;
+
+          if (
+            !date ||
+            !title ||
+            !amount ||
+            date.trim() === '' ||
+            title.trim() === '' ||
+            amount.toString().trim() === ''
+          ) {
+            res.statusCode = 400;
+            res.setHeader('Content-Type', 'text/plain');
+
+            res.end(
+              'Missing required fields: date, title and amount are required',
+            );
+
+            return;
+          }
+
+          const dbDir = path.join(__dirname, '..', 'db');
+
+          if (!fs.existsSync(dbDir)) {
+            fs.mkdirSync(dbDir);
+          }
+
+          const filePath = path.join(dbDir, 'expense.json');
+
+          fs.writeFileSync(filePath, JSON.stringify(bodyParsed, null, 2));
+          res.statusCode = 200;
+
+          if (req.url === '/add-expense') {
+            res.setHeader('Content-Type', 'application/json');
+            res.end(JSON.stringify(bodyParsed));
+          } else {
+            res.setHeader('Content-Type', 'text/html');
+
+            res.end(`
+              <html>
+                <body>
+                  <pre>${JSON.stringify(bodyParsed, null, 2)}</pre>
+                </body>
+              </html>
+            `);
+          }
+        } catch (err) {
+          res.statusCode = 500;
+          res.end('Server error: ' + err.message);
+        }
+      });
+    } else {
+      res.statusCode = 404;
+      res.setHeader('Content-Type', 'text/plain');
+      res.end(`Invalid url: ${req.url}`);
+    }
+  });
 }
 
 module.exports = {