added mognodb database

db.js

@@ -0,0 +1,30 @@
+const { MongoClient, ServerApiVersion } = require('mongodb');
+const { mongodb } = require("./config.json");
+
+let dbClient;
+
+async function connectToDatabase() {
+    if (!dbClient) {
+        // Create a new MongoClient only once
+        dbClient = new MongoClient(mongodb, {
+            serverApi: {
+                version: ServerApiVersion.v1,
+                strict: true,
+                deprecationErrors: true,
+            }
+        });
+
+        await dbClient.connect();
+        console.log("Connected to MongoDB!");
+
+        await dbClient.db("admin").command({ ping: 1 });
+        console.log("Pinged your deployment. You successfully connected to MongoDB!");
+    }
+
+    // Return the existing connection if already connected
+    return dbClient;
+}
+
+module.exports = {
+    connectToDatabase
+};