Why should you care?

Without a shared connection, every route reinventing drivers is fragile.

See it live — copy this example

Run examples in your MernVerse client/ (Vite React) or server/ (Express) folders. Keep secrets in .env.

import mongoose from 'mongoose';

export async function connectDb(uri) {
  mongoose.set('strictQuery', true);
  await mongoose.connect(uri);
  console.log('Mongo connected');
}

// server.js
await connectDb(process.env.MONGO_URI);

Run Example »

Edit the code below and click Run to see the result in Toolliyo’s live editor.

What happened?

• Call connect once at boot.
• Fail fast if URI is missing.
• Use Atlas or local mongodb://127.0.0.1:27017/mernverse.

Practice next

1. Install mongoose.
2. Put MONGO_URI in .env.
3. Connect before listen.
4. Log mongoose.connection.host.
5. Add a disconnect on SIGINT later.

Remember

One connect at startup. Env holds URI. strictQuery keeps queries intentional.

DB online

Notes collection must persist.

Outcome: Server logs Mongo connected.