diff --git a/src/createServer.js b/src/createServer.js
index 89724c920..d9f71bd39 100644
--- a/src/createServer.js
+++ b/src/createServer.js
@@ -1,3 +1,67 @@
-// Write code here
-// Also, you can create additional files in the src folder
-// and import (require) them here
+const http = require('http');
+const { convertToCase } = require('./convertToCase');
+
+function createServer() {
+  const server = http.createServer((req, res) => {
+    const url = req.url || '';
+    const [path, queryString = ''] = url.split('?');
+
+    const text = path.slice(1);
+    const params = new URLSearchParams(queryString || '');
+    const toCase = params.get('toCase');
+
+    const errors = [];
+
+    const allowedCases = ['SNAKE', 'KEBAB', 'CAMEL', 'PASCAL', 'UPPER'];
+
+    if (!text) {
+      errors.push({
+        message:
+          'Text to convert is required. ' +
+          'Correct request is: "/<TEXT_TO_CONVERT>?toCase=<CASE_NAME>".',
+      });
+    }
+
+    if (!toCase) {
+      errors.push({
+        message:
+          '"toCase" query param is required. ' +
+          'Correct request is: "/<TEXT_TO_CONVERT>?toCase=<CASE_NAME>".',
+      });
+    }
+
+    if (toCase && !allowedCases.includes(toCase)) {
+      errors.push({
+        message:
+          'This case is not supported. ' +
+          'Available cases: SNAKE, KEBAB, CAMEL, PASCAL, UPPER.',
+      });
+    }
+
+    if (errors.length) {
+      res.statusCode = 400;
+      res.statusMessage = 'Bad request';
+      res.setHeader('Content-Type', 'application/json');
+      res.end(JSON.stringify({ errors }));
+    } else {
+      const result = convertToCase(text, toCase);
+
+      res.statusCode = 200;
+      res.statusMessage = 'OK';
+      res.setHeader('Content-Type', 'application/json');
+
+      res.end(
+        JSON.stringify({
+          originalCase: result.originalCase,
+          targetCase: toCase,
+          originalText: text,
+          convertedText: result.convertedText,
+        }),
+      );
+    }
+  });
+
+  return server;
+}
+
+module.exports = { createServer };