Como conectar minha API NodeJs no meu banco MongoDB

Minha Api não conecta no meu banco MongoDB rodando no mesmo servidor. Todas as configurações estão feitas, conforme a documentação da Digital Ocean, mas nada dá certo

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If you are using MongoDB Node.js Driver

then try the following code snippet

async function main(){
     * Connection URI. Update <username>, <password>, and <your-cluster-url> to reflect your cluster.
     * See for more details
    const uri = "mongodb+srv://<username>:<password>@<your-cluster-url>/test?retryWrites=true&w=majority";

    const client = new MongoClient(uri);
    try {
        // Connect to the MongoDB cluster
        await client.connect();
        // Make the appropriate DB calls
        await  listDatabases(client);
    } catch (e) {
    } finally {
        await client.close();