🚀 Fix: MongoParseError “useNewUrlParser is not supported” in Next.js (2026)

While building a Next.js App Router project with MongoDB, I ran into this error: MongoParseError: option useNewUrlParser is not supported At first, it looks confusing—especially if you're following older tutorials. Here's a simple breakdown of what’s happening and how to fix it. ❌ The Problem If you're using code like this: const options = { useNewUrlParser : true , useUnifiedTopology : true , }; const client = new MongoClient ( uri , options ); 👉 You’ll get the error: MongoParseError: option useNewUrlParser is not supported 🧠 Why This Happens This error occurs because: Older MongoDB (pre-2021) used these options In MongoDB Node.js Driver v4+, these options were: ❌ Removed ✅ Enabled by default internally So now, passing them manually actually breaks the connection ✅ The Fix (Simple) Just remove the options completely. ✔️ Correct Code const client = new MongoClient ( uri ); That’s it. No extra config needed. 📁 Full Working Example (lib/mongodb.js) import { MongoClient } from ' mongodb '