Update index.js

index.js

@@ -140,6 +140,11 @@ app.post('/v1/generate-key', async (req, res) => {
     if (isNaN(userIdNumber)) {
       return res.status(400).json({ error: "Invalid or missing user_id" });
     }
+    const existingUser = await collection.findOne({ owner: userIdNumber });
+
+    if (existingUser) {
+      return res.status(200).json({ apiKey: `API key already: ${existingUser.key}` });
+    }
     const userDocument = {
       key: newKey,
       createdAt: new Date(),