added express js

db.js

@@ -0,0 +1,20 @@
+import { MongoClient } from "mongodb";
+
+const client = new MongoClient(`mongodb://${process.env.MONGODB_USER}:${process.env.MONGODB_PASSWORD}@${process.env.MONGODB_URL}`);
+
+const dbName = `jeopardy`;
+
+/**
+ * @type {Db}
+ */
+export let db;
+
+export async function initDbConnection() {
+    await client.connect();
+    console.log('Connected successfully to mongodb');
+    db = client.db(dbName);
+}
+
+export function close() {
+    client.close();
+}