const {MongoClient} = require('mongodb')
// or as an es module:
// import { MongoClient } from 'mongodb'

// Connection URL
const url = `mongodb://username:password@localhost:27017/test`
const client = new MongoClient(url, {
    tlsAllowInvalidHostnames: false,
    tlsCAFile: "./src/rds-combined-ca-bundle.pem",
    sslValidate: false,
    serverSelectionTimeoutMS: 3000,
    useUnifiedTopology: true,
})

// Database Name
const dbName = 'myProject'

async function main() {
    // Use connect method to connect to the server
    await client.connect()
    console.log('Connected successfully to server')
    const db = client.db(dbName)
    const collection = db.collection('documents')

    // the following code examples can be pasted here...

    return 'done.'
}

main()
    .then(console.log)
    .catch(console.error)
    .finally(() => client.close())

MongoServerSelectionError: Server selection timed out after 3000 ms
    at Timeout._onTimeout (/long/path/node_modules/mongodb/lib/sdam/topology.js:296:38)
    at listOnTimeout (internal/timers.js:554:17)
    at processTimers (internal/timers.js:497:7) {
  reason: TopologyDescription {
    type: 'Unknown',
    servers: Map(1) { 'localhost:27017' => [ServerDescription] },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    logicalSessionTimeoutMinutes: undefined
  }
}