@peter.grainger That’s the way to configure TLS with client certificates to strengthen the client authentication security beyond username/password.
Most redis providers just give you a connection string that starts with rediss:// (notice the double s), which means it uses a TLS socket, and that is recognized and used by the node redis package (check redis - npm and search for rediss in the page)
Do you need a setup with redis client authentication with client certificates? (in this scenario you should also configure the server to trust those client certificates that connect to it)