diff --git a/src/convertToCase/detectCase.js b/src/convertToCase/detectCase.js
index c1825c76d..c024c5a12 100644
--- a/src/convertToCase/detectCase.js
+++ b/src/convertToCase/detectCase.js
@@ -10,7 +10,6 @@ function detectCase(text) {
   }
 
   if (text.toLowerCase() === text) {
-    if (text.includes('_') || text.includes('-')) {
       // There are no uppercase in the text, so it's one of the lower cases
       // See if they're snake or kebab
       if (text.includes('_')) {
@@ -21,7 +20,6 @@ function detectCase(text) {
         return 'KEBAB';
       }
     }
-  }
 
   if (text[0].toUpperCase() === text[0]) {
     return 'PASCAL';
diff --git a/src/createServer.js b/src/createServer.js
index 89724c920..b80c8e3ab 100644
--- a/src/createServer.js
+++ b/src/createServer.js
@@ -1,3 +1,58 @@
-// 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/convertToCase');
+const CASES = ['SNAKE', 'KEBAB', 'CAMEL', 'PASCAL', 'UPPER'];
+
+function validateParams(text, toCase) {
+  const errors = [];
+
+  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 && !CASES.includes(toCase.toUpperCase())) {
+    errors.push({
+      message:
+        'This case is not supported. Available cases: SNAKE, KEBAB, CAMEL, PASCAL, UPPER.'
+    });
+  }
+
+  return errors;
+}
+
+function createServer() {
+  return http.createServer(function (req, res) {
+    const [path, queryString] = req.url.split('?');
+
+    const params = new URLSearchParams(queryString);
+    const toCase = params.get('toCase');
+    const errors = validateParams(path.slice(1), toCase);
+
+    if (errors.length) {
+      res.setHeader('Content-Type', 'application/json');
+      res.statusCode = 400;
+      res.end(JSON.stringify({ errors }));
+
+      return;
+    }
+
+    const target = { originalText: path.slice(1), targetCase: toCase };
+    const result = convertToCase(path.slice(1), toCase);
+
+    res.setHeader('Content-Type', 'application/json');
+    res.statusCode = 200;
+
+    res.end(JSON.stringify({ ...result, ...target }));
+  });
+}
+
+module.exports = { createServer };