diff --git a/index.js b/index.js
index eb4a705..f6da8d4 100644
--- a/index.js
+++ b/index.js
@@ -6,30 +6,30 @@ module.exports = async (req, res) => {
   const parsed = queryString.parse(req.url.slice(1));
   const response = {};
 
-  if (!parsed.url) {
-    response.error = 'valid url is required';
-    send(res, 400, response);
-  }
+  if (parsed.url) {
+    const options = {
+      debug: !!parsed.debug || false,
+      delay: parsed.delay || 500,
+      maxDepth: parsed.maxDepth || 3,
+      maxUrls: parsed.maxUrls || 10,
+      maxWait: parsed.maxWait || 3000,
+      recursive: !!parsed.recursive || true,
+      userAgent: parsed.userAgent || 'Wappalyzer',
+    };
+    const wappalyzer = new Wappalyzer(parsed.url, options);
 
-  const options = {
-    debug: !!parsed.debug || false,
-    delay: parsed.delay || 500,
-    maxDepth: parsed.maxDepth || 3,
-    maxUrls: parsed.maxUrls || 10,
-    maxWait: parsed.maxWait || 3000,
-    recursive: !!parsed.recursive || false,
-    userAgent: parsed.userAgent || 'Wappalyzer',
-  };
-  const wappalyzer = new Wappalyzer(parsed.url, options);
-
-  try {
-    const data = await wappalyzer.analyze();
-    response.url = parsed.url;
-    response.options = options;
-    response.data = data;
-    send(res, 200, response);
-  } catch (e) {
-    response.error = e.message;
+    try {
+      const data = await wappalyzer.analyze();
+      response.url = parsed.url;
+      response.options = options;
+      response.data = data;
+      send(res, 200, response);
+    } catch (e) {
+      response.error = e.message;
+      send(res, 400, response);
+    }
+  } else {
+    response.error = 'valid url is required';
     send(res, 400, response);
   }
 };