Config.json -

.NET Core uses similar appsettings.json files to map configuration data to strongly typed objects for better error checking.

Enabling or disabling specific application features or "flags" at runtime. config.json

A config.json file is a plain-text file used by software applications to store settings and parameters in the format. It allows developers to separate application logic from its configuration, enabling behavior changes—like switching database URLs or toggling features—without modifying or recompiling the source code. Core Purpose and Use Cases config.json

Tools like Homebridge use it to define which plugins and smart home accessories should be loaded. config.json