1. What would you like to communicate to the user about this feature? We've removed support for the listed options in favor of the tls-* variants. See the table here: https://github.com/mongodb/node-mongodb-native/pull/3743 The non standard tlsCertificateFile has been removed, users should use tlsCertificateKeyFile, note the documentation from the driver specification: Path to the client certificate file or the client private key file; in the case that they both are needed, the files should be concatenated 2. Would you like the user to see examples of the syntax and/or executable code and its output? We should remove tlsCertificateFile from: https://www.mongodb.com/docs/drivers/node/current/fundamentals/connection/tls/#provide-certificate-filepaths I think the advice to use node's secureContext and reading in file contents remains correct and the better approach if you need to specify certificate and key and have the data for each in a separate file. 3. Which versions of the driver/connector does this apply to? v6.0.0, next major version, this is a breaking change.