Confidence Configuration API

Confidence is a configuration management library that provides a structured document format and an API for serving dynamic configuration values. It builds upon standard JSON objects, introducing special `$`-prefixed keys for filtering values based on defined criteria, facilitating environment-specific configurations, A/B testing, and dynamic value selection. The current stable version is 5.0.1, which requires Node.js v12 or higher; older Node.js environments (pre-v12) must use version 4.x. The project is actively maintained, with releases primarily driven by bug fixes, feature enhancements, and Node.js compatibility updates. Its key differentiators include built-in support for environment variables, criteria-based filtering, value ranges for A/B testing, and metadata attachment, making it a robust solution for complex application configurations.