How to connect to Amazon DocumentDB from Node.js

Question

How do I connect to Amazon's new DocumentBD database from node.js (In this case, using an out-of-the-box Elastic Beanstalk setup.)

This is my code, copied from the docs (with some values altered for privacy). It just times out and the eventual value of 'err' is 'true'. What did I miss? How can I get a better error?

var MongoClient = require('mongodb').MongoClient,fs = require('fs');
var ca = [fs.readFileSync("rds-combined-ca-bundle.pem")];
var connection_string = "mongodb://USERNAME:PASSWORD@docdb-2019-04-23-12-55-44.cluster-abcdefghij.eu-west-1.docdb.amazonaws.com:27017/?ssl=true&&replicaSet=rs0&readPreference=secondaryPreferred";

MongoClient.connect(
        connection_string, {
            sslValidate: true,
            sslCA: ca,
            useNewUrlParser: true
        },
        function (err,client) {
            console.log(err+" , "+ client);
        });

Here's hoping somebody knows.

Answer 1

A timeout is often an indication that security groups are not properly configured. Check your DocumentDB inbound security group configuration to ensure that traffic from the source is permitted to your DocumentDB instance.

Answer 2

Removing the cluster- from the URL seems to work for me.

Answer 3

Great suggestion by hephalump@. Wanted to point you to the exact documentation. You can refer to point number 7.d of this documentation which talks about setting up the rules for security groups.