Joycon is a configuration file loader and manager. It simplifies the process of finding, loading, and merging configuration files across various formats like JSON, YAML, and JavaScript. It supports multiple configuration directories and provides a unified API for accessing configuration data. Joycon excels at handling complex configuration scenarios in Node.js projects and command-line tools, making it a valuable tool for managing application settings effectively and consistently. It supports customizable loaders and resolvers.