Wait until MongoDB has completed its query without using callbacks - node.js

Question

I have an issue with the asynchrous programming model in Node.js.
I know this has been asked before, but so far I haven't found anything that I can use to solve my issue.
How do I force console.log from running before dbQueryName has been invoked and username has gotten its value from it?
var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/";
function dbQueryName() {
MongoClient.connect(url, function(err, db) {
if (err) throw err;
var dbo = db.db("mydb");
dbo.collection("users").findOne({}, function(err, result) {
if (err) throw err;
return result.name
db.close();
});
});
}
var username = dbQueryName();
// Wait until dbQueryName() has been invoked and username has gotten its value before running this
console.log(username);
I have managed to get it working using a callback parameter in the function, but is there a way to do this with less code and indentation?
function dbQueryName(callback) {
MongoClient.connect(url, function(err, db) {
if (err) throw err;
var dbo = db.db("mydb");
dbo.collection("users").findOne({}, function(err, result) {
if (err) throw err;
callback(result.name)
db.close();
});
});
}
dbQuery(function(result){
var username = result
console.log(username);
});

Answer 1

Yes if you are not passing a callback to MongoClient.connect or collection.findOne, it returns a promise.
But you need to add another function to use async await
init()
async function dbQueryName() {
const db = await MongoClient.connect(url);
const dbo = db.db("mydb");
const user = await dbo.collection("users").findOne({})
return user.name
}
async function init() {
try {
const name = await dbQueryName()
} catch (error) {
console.log(error);
}
}