svrjs-nextjs-website/lib/db.ts

import { MongoClient } from "mongodb";

// Ensure the environment variable is set
if (!process.env.MONGODB_URI) {
	throw new Error('Invalid/Missing environment variable: "MONGODB_URI"');
}

const uri = process.env.MONGODB_URI;
const options = {
	// Add any SSL/TLS options if needed, for example:
	// ssl: true,
	// tlsAllowInvalidCertificates: true,
};

let client: MongoClient;
let clientPromise: Promise<MongoClient>;

declare global {
	var _mongoClientPromise: Promise<MongoClient> | undefined;
}

client = new MongoClient(uri, options);
clientPromise = client.connect();

export default clientPromise;