Bad Mobs — Guide

Getting Started

Nothing needs to be crafted - Bad Mobs is pure configuration:

Open the mods list from the title screen or the pause menu.
Select Bad Mobs and press the Config button - the mod's configuration screen opens.
Pick an entity from the alphabetical list (every entity in the game has an entry, grouped by the namespace it comes from) and press Edit....
Toggle that entity's spawn options (see Configuration Options).
Done. Changes apply immediately - no restart needed. Any blocked entity vanishes the next time it tries to enter the world.

Prefer files? The same settings live in badmobs-common.toml inside the world's/instance's config folder and can be edited with any text editor.

Bad Mobs works server-side:

On a dedicated server, install the mod on the server and configure badmobs-common.toml there - spawn control applies to the whole world for every connected player.
Server admins get per-world control: each server instance carries its own config, so different worlds can run different blacklists.
In single player, the mod runs with your local game and the in-game config screen edits your world's behavior directly.
The filtering happens where entities are spawned (the server side of the game), which is what makes join-time removal reliable for natural spawns, spawners, eggs and conversions alike.

Bad Mobs does not delete entities that already exist - it filters new arrivals:

Whenever an entity tries to join the world, the mod checks that entity's config section.
If the route it used is disabled (allowNormalSpawning, allowSpawners, allowSpawnEggs or allowConversions), the entity is removed on the spot - it never appears, makes no sound and drops nothing.
Mobs that were already in the world before you blocked them stay until they despawn or are killed; only new spawn attempts are filtered.
Blocking is per entity id: blacklisting zombies does not affect skeletons, and passive animals keep spawning normally unless you block them too.