I’ve been struggling with getting my cluster to connect in various node.js applications. Here’s the following troubleshooting techniques I’ve tried:
Database access - I’ve confirmed that my password for ‘user1’ is typed in correctly in the below connection URL.
Network access - 0.0.0.0/0 is on my list of IP Addresses in the IP Access List. It says in parentheses that this includes my current IP address.

Here’s the code copied from Clusters → Connect → MongoDB Driver connection code sample on the mongoDB website (my cluster’s name is Cluster0):

const { MongoClient, ServerApiVersion } = require('mongodb');
const uri = "mongodb+srv://user1:<password>@cluster0.1umconu.mongodb.net/?retryWrites=true&w=majority&appName=Cluster0";
// Create a MongoClient with a MongoClientOptions object to set the Stable API version
const client = new MongoClient(uri, {
  serverApi: {
    version: ServerApiVersion.v1,
    strict: true,
    deprecationErrors: true,
  }
});
async function run() {
  try {
    // Connect the client to the server	(optional starting in v4.7)
    await client.connect();
    // Send a ping to confirm a successful connection
    await client.db("admin").command({ ping: 1 });
    console.log("Pinged your deployment. You successfully connected to MongoDB!");
  } finally {
    // Ensures that the client will close when you finish/error
    await client.close();
  }
}
run().catch(console.dir);