Minecraft server properties for the server.properties file. Only has an effect when services.minecraft-server.declarative is set to true. See https://minecraft.wiki/w/Server.properties#Java_Edition for documentation on these values.

{ }

{
  server-port = 43000;
  difficulty = 3;
  gamemode = 1;
  max-players = 5;
  motd = "NixOS Minecraft server!";
  white-list = true;
  enable-rcon = true;
  "rcon.password" = "hunter2";
}