Create: SchematicChecker
by PInk_Cats
Schematic Checker is a server-side safeguard for Create schematics, scanning uploads and blocking or sanitizing known malicious NBT patterns before they are printed into a world.
What it does
Schematics are scanned asynchronously, so the scan runs off the Minecraft server main thread. When a known malicious Create schematic exploit is detected, the mod blocks it, and specified data can be cleaned instead of rejected outright. High-risk block entities such as belts, drive chains, arms and fluid storage are checked one by one, and logs plus optional schematic backups are kept for auditing and later investigation.
The mod targets servers that let players upload Create schematics, including setups running Create addons. Its rule updates can be synced online, but only when the server owner enables that option. Create is required, and Just Enough Items (JEI) and Observable are optional. Works on either side, and neither needs it: the mod can run on a server alone, so players need nothing extra. Files exist for Fabric, Forge, NeoForge and Quilt across 8 release versions, 1.14.4 – 1.21.1, and the GNU General Public License v3.0 only covers the code, which is open source.
Key features
Asynchronous schematic scanning
Uploaded schematics are checked off the main server thread, so scanning does not stall the game loop.
Known exploit blocking
Malicious Create schematic patterns that have been reported are detected and stopped before placement.
Selective data cleaning
Chosen parts of a schematic's data can be cleaned rather than rejected, keeping the valid parts of a build.
High-risk block entity checks
Belts, drive chains, arms, filters, fluid storage and clipboards are validated individually.
Audit logs and backups
Logs and optional schematic backups are written for later investigation of suspicious uploads.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Optional 2
Use cases
Public Create servers
Server owners who accept schematic uploads from many players can screen them before anything is placed in the world.
Addon-heavy modpacks
Packs with several Create addons can use the mod to cover addon-specific exploits alongside core Create blocks.
Who it’s for: Server owners and administrators who allow players to upload or print Create schematics, especially on multiplayer servers running Create addons.
Questions
Does Schematic Checker have to be installed on the client?
Which Create version does a build need?
Can server owners turn off online rule updates?
In the catalog
Create: SchematicChecker is one of 5,392 Social mods on ModsFinder, and one of 4,084 Social mods for Fabric. 32,366 mods support Minecraft 1.21.1.
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What the author says
Create: Schematic Checker is a server-side protection mod for Create schematics. It scans uploaded schematics and blocks or sanitizes known malicious NBT patterns before they can be printed into a world. CSC is designed for public and survival servers that allow schematic uploads. It protects against known Create…
Official listing
- Modrinth page
- modrinth.com/mod/createschematicchecker
- Owner
- PInk_Cats
- Published
- 2025-10-02
- Updated on Modrinth
- 2026-09-27
- Facts verified
- 2026-10-15