Solution

src/createServer.js

@@ -1,3 +1,62 @@
-// Write code here
-// Also, you can create additional files in the src folder
-// and import (require) them here
+/* eslint-disable max-len */
+
+const http = require('http');
+const { convertToCase } = require('./convertToCase');
+
+const createServer = () => {
+  const server = http.createServer((req, res) => {
+    const url = new URL(req.url, `http://${req.headers.host}`);
+    const textToConvert = url.pathname.slice(1);
+    const toCase = url.searchParams.get('toCase');
+
+    const errors = [];
+
+    if (!textToConvert) {
+      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 &&
+      !['SNAKE', 'KEBAB', 'CAMEL', 'PASCAL', 'UPPER'].includes(toCase)
+    ) {
+      errors.push({
+        message:
+          'This case is not supported. Available cases: SNAKE, KEBAB, CAMEL, PASCAL, UPPER.',
+      });
+    }
+
+    if (errors.length > 0) {
+      res.writeHead(400, 'Bad request', { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({ errors }));
+
+      return;
+    }
+
+    const result = convertToCase(textToConvert, toCase);
+
+    res.writeHead(200, 'OK', { 'Content-Type': 'application/json' });
+
+    res.end(
+      JSON.stringify({
+        originalCase: result.originalCase,
+        targetCase: toCase,
+        originalText: textToConvert,
+        convertedText: result.convertedText,
+      }),
+    );
+  });
+
+  return server;
+};
+
+module.exports = { createServer };