My database query function always return null

Question

I maked query function for my project. But result always is null, how i can debug this code?

const queryDB = async (collection,filter) =>  {
  let result = null
  await MongoClient.connect(url, function(err, getDb) {
    if (err) throw err;
    const db = getDb.db("global"); 
    db.collection(collection).findOne(filter, function(err, result) {
      if (err) throw err;
      result = result
    })
  })
  return result
}

Answer 1

Maybe this works

queryDB = (collection, filter) => {
  await client.connect();
  const db = client.db(dbName);
  return db.collection(collection).findOne(filter);
}

queryDB("collection", "filter").then((err, result) => {
  if(err) throw err;
  console.log(result)
})