Unpacking Config & Env Variables in Node.js

Configuration management in Node.js applications is often treated as an afterthought, leading to security vulnerabilities and production issues. Common problems include secrets leaking into logs, hardcoded credentials, and silent failures from missing environment variables. Best practices include validating configuration immediately at startup, maintaining a single source of truth across environments, keeping secrets out of code and logs, and treating configuration as first-class code. When using Kubernetes, avoid simply copying messy .env files into ConfigMaps and instead properly distinguish between sensitive and non-sensitive configurations while validating them at deployment time.