BetterConfig

A developer registers a Configs class in the mod's onInitialize method on Fabric, or in the plugin's onEnable method on Paper, and the library then builds the commands that read and change those values. Clients and servers use different command roots, so a player edits client settings with one command and a server owner edits server settings with another. The replacement of the mod's identifier in those examples is handled by the developer, not the player.

Once a value is registered, the code can read it directly through the Configs class, and a player can change it at runtime with the config command instead of editing a file. The library also covers cases beyond simple single values: developers can write their own update methods, add setters, adders, putters and removers through the Config annotation, and manage key-value entries in map-based settings. Details of each annotation and parameter are documented in the JavaDocs, and the library's sample Configs classes for Fabric and Paper show a full working setup.

Installation details are short: the library is published for Fabric on the catalog side, for 1.19.3 – 1.21, and it is also offered for Paper as a server platform. Either side can run it, and neither needs it, so a player can run it alone, a server can run it alone, or both can run it. BetterConfig is open source under the GNU Lesser General Public License v3.0 or later.