CurseForge · Minecraft mod

Longer Command Box

Removes the 256-character limit on the chat and command input box, raising it to 32,767 characters. Send long NBT commands (setblock, summon, give) without truncation — client-side only, no Fabric API required, for Minecraft 26.1+.

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Quick answer

Which Longer Command Box release matches 26.1.2?

Updated 24 days ago

Best match for your filters longercommandbox-1.0.0-26.1.2.jar

Game version 26.1.2

Loader Fabric

Longer Command Box longercommandbox-1.0.0-26.1.2.jar targets 26.1.2 with Fabric. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.

Where it goes

Is Longer Command Box required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say

Dedicated server Source doesn’t say

Loader for this release Fabric

Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does Longer Command Box longercommandbox-1.0.0-26.1.2.jar need?

longercommandbox-1.0.0-26.1.2.jar on 26.1.2. Every mod below is checked against that same setup.

No extra mods listed for this file

This file does not list any required mods. Do not add a library just because a different file uses it.

This file does not list any required or optional mods.

Before you install it

Add Longer Command Box without breaking your instance.

Built for Longer Command Box longercommandbox-1.0.0-26.1.2.jar on 26.1.2. Pick another file and the loader, install side or required mods may change.

01
Stick to this file

Use longercommandbox-1.0.0-26.1.2.jar. It targets 26.1.2 with Fabric; another release may have different loader, side or dependency requirements.
02
Bring the mods it needs

This file does not list any required mods. Do not add a library just because a different file uses it.
03
Put it on the correct side

The project page does not say whether this file belongs on the client, dedicated server, or both.
04
Pick the file you checked

Use the “Get this file” button beside longercommandbox-1.0.0-26.1.2.jar. It opens that exact file at the source.

About this project

What does Longer Command Box add?

Longer Command Box

Type and send commands up to the server's real 32,500-character limit - no more 256-character wall.

What it does

Input limit raised from 256 to 32,767 characters: the chat and command input box (ChatScreen) accepts the full range.
Commands are no longer truncated before sending: Minecraft 26.2 silently cuts every command to 256 characters on its way out (normalizeChatMessage to trimChatMessage). This mod bypasses that truncation for slash commands, so long NBT commands are transmitted intact.
Only the chat and command box is affected: signs, books, server-address fields and other text widgets keep vanilla behaviour.

The result

Long commands now work, up to the limit the server accepts:

Commands (setblock, summon, give, data, ...): client limit 32,767 (this mod), server limit about 32,500.

Plain chat messages: client limit 32,767 (input only), server limit 256 (vanilla server).

A 449-character setblock command that places a zombie spawner with full iron armor, trims and effects - typed in one go, executed as-is.

Why Minecraft 26.1+ needs this

Minecraft 26.1+ refactored the UI and chat-send layers, which introduced two 256-character walls:

EditBox.setMaxLength(256): the input box refuses anything past 256 characters.
New in 26.1+: ChatScreen.normalizeChatMessage() applies StringUtil.trimChatMessage(), a hard substring(0, 256) truncation on every message, commands included, right before it is sent. Even with a raised input limit, commands were cut to 256 and the server failed with "Expected literal ','".

Longer Command Box fixes both: the box accepts more, and commands leave the client intact.

Requirements

Minecraft 26.1+
Fabric Loader 0.19.3 or newer
Java 25 or newer
No Fabric API required: the mod uses only Mixin and the Fabric Loader.

Limitations

Client-side only (environment: client). Servers enforce their own rules:
Commands: about 32,500 characters on vanilla servers - plenty for long NBT.
Plain chat messages: still rejected at 256 characters by vanilla servers; sending longer chat requires server-side support.
Works in singleplayer and multiplayer. No server-side mod needed for long commands.

Technical details

Two targeted Mixins on ChatScreen:

init: re-applies setMaxLength(32767) after vanilla's 256.
normalizeChatMessage: skips the 256-character truncation for slash commands, keeping plain chat messages on vanilla behaviour.

Project description from CurseForge.

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