Fix console.err & format code

connection.js

@@ -1,6 +1,6 @@
-const {MongoClient} = require('mongodb');
+const { MongoClient } = require('mongodb');
 
-async function main(){
+async function main() {
     /**
      * Connection URI. Update <username>, <password>, and <your-cluster-url> to reflect your cluster.
      * See https://docs.mongodb.com/ecosystem/drivers/node/ for more details
@@ -28,13 +28,13 @@ async function main(){
     }
 }
 
-main().catch(console.err);
+main().catch(console.error);
 
 /**
  * Print the names of all available databases
  * @param {MongoClient} client A MongoClient that is connected to a cluster
  */
-async function listDatabases(client){
+async function listDatabases(client) {
     databasesList = await client.db().admin().listDatabases();
 
     console.log("Databases:");