implemented server

src/createServer.js

@@ -1,8 +1,54 @@
 'use strict';
 
+const http = require('http');
+const fs = require('fs').promises;
+
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
+  const server = http.createServer(async (req, res) => {
+    const parsedUrl = new URL(req.url, `http://${req.headers.host}`);
+
+    if (parsedUrl.pathname !== '/add-expense') {
+      res.statusCode = 404;
+
+      return res.end('Bad request');
+    }
+
+    let requestBody = '';
+
+    for await (const chunk of req) {
+      requestBody += chunk;
+    }
+
+    let expenseData;
+
+    try {
+      expenseData = JSON.parse(requestBody);
+    } catch (error) {
+      res.statusCode = 400;
+
+      return res.end(`${error.message} error`);
+    }
+
+    const { date, title, amount } = expenseData;
+
+    if (!date || !title || !amount) {
+      res.statusCode = 404;
+
+      return res.end('No data received');
+    }
+
+    try {
+      await fs.writeFile('./db/expense.json', requestBody);
+      res.statusCode = 200;
+      res.setHeader('Content-Type', 'application/json');
+      res.end(requestBody);
+    } catch (error) {
+      res.statusCode = 500;
+      res.end('error saving data');
+    }
+  });
+
+  return server;
 }
 
 module.exports = {

src/db/expense.json

@@ -0,0 +1,17 @@
+[
+  {
+    "id": "1741863024015",
+    "amount": null,
+    "createdAt": "2025-03-13T10:50:24.015Z"
+  },
+  {
+    "id": "1741863024066",
+    "amount": null,
+    "createdAt": "2025-03-13T10:50:24.066Z"
+  },
+  {
+    "id": "1741863024083",
+    "amount": null,
+    "createdAt": "2025-03-13T10:50:24.083Z"
+  }
+]