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Block Blocker

Event Prevention for Blocks

FabricNeoForgeForge
Loaders
FabricNeoForgeForge
Downloads on Modrinth
10.7K
Followers on Modrinth
10
versions
32
Updated
September 10, 2026Sep 10
Published
in 2022

At a glance

Runs on Fabric, NeoForge and Forge
For Minecraft 1.21.4, 1.21.11 …
Server only — players don't need to install it
Latest version — 1.4.3 from September 10, 2026
License MIT — free
Where it's needed
In gamenot neededOn serverrequired

Install on the server only; players don't need it

Game versions1.21.1, 1.21.4, 1.21.11 …

 

 

There are a few cases in the course of modding history where it is evident that a mechanism is required to prevent the breaking or placing of blocks into the Minecraft world. This mod provides a configuration that allows a server administrator to specify the blocks that they do not want to be breakable nor to be placed.

 

For example:

In some versions of Ice and Fire there exists a pixie house that is world gen'd in and when it is broken the client and server both crash. To prevent this you would add the ID for the pixie house to the configuration and restart your server. Now no one can break the block and crash the server.

 

There may be other cases where you would want this behavior.

 

Another example:

You have a hard mode pack and you want to make it harder, therefore you add other blocks to the list to prevent them from being broken much like bedrock. Stone, Gravel, Sand could be some. 

 

Similarly why stop there, maybe there are certain blocks in your world that have crafting uses but you don't want to see them placed in your world. For instance you don't want people building dirt towers or lava sources. You would add those ID's to the prevent-placement section of the configuration and restart your server.

 

 

 

The mod is not required on the client but can exist and run there as well, which is great for LAN and Hamachi play too.

 

The following example config is the config that generates when you first run the mod, this way you can prepopulate the config the with blocks you want to block for placing and harvesting.

 

blockblocker.cfg

 

Notes

Does not block fluid placement. There is an excellent mod that does that already found at https://www.curseforge.com/minecraft/mc-mods/no-lava-bucketing

 

Now ported to 1.7.10

 

None of the versions support title entities or nbt data. Possibly planned, but can't say when, a fat donation of higher than $20 at https://patreon.com/kreezxil can speed up this process. Make sure you send me a message via private what your donation email was and what it was for.

 

Modpacks

No need to ask, just add. A link back not required but sure would be sweet.

 

Reviewers

Go ahead. Let me know and I'll feature it. I only ask that you link back to this page in your review description.

 

 

 

FAQ

How to install Block Blocker?

Install Fabric for your Minecraft version, download Block Blocker for the same version and loader, put the file into the mods folder and launch the game with the loader profile.

Which Minecraft versions does Block Blocker support?

Block Blocker has builds for Minecraft 1.20.4, 1.21.1, 1.21.4, 1.21.11 ….

Is Block Blocker needed on the server?

Server only — players don't need to install it

License and source
MIT Licensefree to use and share with credit to the author
Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders

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