How to use MongoDB with promises in Node.js?

To use MongoDB with promises in Node.js, we use async and await.

For instance, we write

const main = async () => {
  let client, db;
  try {
    client = await MongoClient.connect(mongoUrl, { useNewUrlParser: true });
    db = client.db(dbName);
    const dCollection = db.collection("collectionName");
    const result = await dCollection.find();
    return result.toArray();
  } catch (err) {
    console.error(err);
  } finally {
    client.close();
  }
};

to call connect to connect to the Mongo database.

We call db to get the database.

We call collection to get the collection.

And we call find to return a promise with the collection data.

We call toArray to convert the data to an array.