Fiw AntiCheat

Professional mod verification, modpack enforcement, and admin investigation tools for Minecraft servers.

Fiw AntiCheat helps server owners deal with unwanted client mods without guessing what players are running. On join, the server challenges the client companion mod, records the reported mod list, checks it against configurable rules, and gives admins readable tools for enforcement, rollout, and investigation.

This is built for real server administration: blacklist known unfair mods, enforce an official modpack with a whitelist, monitor detections before kicking, and keep per-player mod profiles so staff can see what changed over time.

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Why Fiw AntiCheat?

Most anti-cheat setups focus only on movement or combat behavior. Fiw AntiCheat focuses on client mod visibility and modpack integrity:

• Detect common unfair mod categories such as cheat clients, x-ray, fullbright, freecam, autoclickers, and schematic printers
• Enforce an official modpack list for private SMPs, events, staff servers, and modded communities
• Keep readable player mod profiles with noisy loader/API entries separated from real installed mods
• Let admins roll out rules safely with monitor-only mode before kicking players
• Work across Fabric, Forge, and NeoForge targets with one shared rule engine

Fiw AntiCheat is an admin enforcement tool and mod verification layer. It is not magic and does not claim to be cheat-proof: a malicious custom client can lie. It is designed to make honest clients enforceable, catch common unwanted mods, and give staff practical visibility.

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Supported Targets

Loader	Minecraft	Status
Fabric	1.21.1	Active
NeoForge	1.21.1	Active
Fabric	1.21.11	Active
NeoForge	1.21.11	Active
Fabric	1.20.1	Active
MinecraftForge	1.20.1	Active

NeoForge does not publish a real Minecraft 1.20.1 artifact on the current NeoForge Maven, so the 1.20.1 Forge-family build targets MinecraftForge 47.x.

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Features

• Blacklist mode - allow normal mods while blocking selected unfair categories
• Whitelist mode - enforce a captured official modpack list
• Built-in signature database - detects known unfair mods by id and stable markers such as packages or mixin configs
• Admin profiles - view each player's current mods, platform/loader entries, and recent changes
• Readable grouping - Fabric, Forge, NeoForge, API, and loader noise is separated from player-installed mods
• Monitor-only rollout - log and alert staff without kicking while tuning your rules
• Staff alerts - online operators can see detections as they happen
• Bypass list - exempt trusted accounts or test users by name or UUID
• Floodgate/Geyser support - optional Bedrock-player exemption when Floodgate is present
• Hot reload - reload config and signatures without restarting
• Server snapshots - capture the server or an online player as the official whitelist baseline

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Commands

All commands require permission level 4.

Command	Does
/fiwmods reload	Reload config and bundled signatures
/fiwmods snapshot server	Capture the server's loaded mods into the whitelist
/fiwmods snapshot player <name>	Capture an online player's reported mods into the whitelist
/fiwmods profile <name>	Show grouped current mods and recent profile history

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Configuration

The config is generated at:

config/fiw-mods-api/config.json

The internal config folder keeps the original id for compatibility, even though the public mod name is Fiw AntiCheat.

Main options:

Option	Purpose
mode	blacklist or whitelist
detection.preset	strict, balanced, lenient, or custom
detection.monitor_only	Log detections without kicking
detection.allow_overrides	Allow specific signatures/categories even if preset blocks them
detection.banned_mods	Add exact mod ids to block
exemptions.bypass_players	Bypass specific names or UUIDs
whitelist.official_mods	Official modpack snapshot used in whitelist mode

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Requirements

Target	Requirements
Fabric 1.20.1	Fabric Loader, Fabric API, Java 17
MinecraftForge 1.20.1	Forge 47.x, Java 17
Fabric 1.21.1	Fabric Loader, Fabric API, Java 21
NeoForge 1.21.1	NeoForge 21.1.x, Java 21
Fabric 1.21.11	Fabric Loader 0.19.2+, Fabric API 0.141.4+1.21.11, Java 21
NeoForge 1.21.11	NeoForge 21.11.x, Java 21

Install Fiw AntiCheat on the server and on player clients. The client companion is what reports the mod list to the server.

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Best Uses

• Private SMP modpack enforcement
• Event servers where everyone must use the same mod list
• Staff visibility into suspicious or changing client setups
• Blocking common unfair utility mods without locking down harmless QoL mods
• Gradual anti-cheat rollout with monitor-only logging before enforcement

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License

Fiw AntiCheat is all rights reserved under the Fiw AntiCheat Proprietary
License. Normal server/client use is allowed, but redistribution,
reuploads, modified builds, forks, reverse engineering, resale, and derivative
works require written permission from Fi3w0.

Contact: Discord fi3w0.

Contact me: @Fi3w0 on Github/Discord

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Made by Fi3w0 — built for a private SMP, shared with everyone.