Connecting

The MongoClient connection method returns a Promise if no callback is passed to it. Below is an example using the async/await commands.

const MongoClient = require('mongodb').MongoClient; const assert = require('assert'); (async function() { // Connection URL const url = 'mongodb://localhost:27017/myproject'; // Database Name const dbName = 'myproject'; const client = new MongoClient(url, { useNewUrlParser: true }); try { // Use connect method to connect to the Server await client.connect(); const db = client.db(dbName); } catch (err) { console.log(err.stack); } client.close(); })(); 

The client.connect function returns a Promise that we then execute using the await keyword inside of an async function. If an error happens during the client.connect the error is caught by the try/catch and can be handled as if it were a normal Javascript error.