Knex.js PostgreSQL SSL connection fails in production with self-signed certificate authority

PostgreSQL SSL Configuration Inconsistency Between Local and Production Environments

When configuring Knex.js to connect to PostgreSQL, local development environments often omit SSL settings entirely, allowing connections to succeed on localhost without encryption. However, managed production PostgreSQL instances typically require TLS for all connections. The ssl option passed through to the node-postgres driver determines whether connections can be established, but default behavior may fail when the production server uses certificates signed by a private or self-signed CA.

Knex forwards the ssl configuration directly to node-postgres, which validates server certificates by default. Using ssl: true alone can fail in production environments that do not present certificates trusted by the system's default CA bundle. Conditional configuration in knexfile.js that applies SSL only in production environments can mask these issues during local development, making the defect invisible until deployment.

Disabling certificate validation with rejectUnauthorized: false resolves connection failures but introduces security risks including man-in-the-middle attacks. The proper solution involves configuring ssl.ca with the appropriate certificate authority, but this requires access to the production server's certificate chain.

Which approach provides the recommended balance between security and connectivity when Knex.js connects to a managed PostgreSQL instance with a self-signed certificate authority?

How should the ssl configuration be structured in the production knexfile to properly validate the server certificate while maintaining secure connections?

What verification steps should be taken to confirm that SSL connections are properly established and certificate validation is functioning correctly in production?