Codecium

A Fabric mod that vastly improves codec error messages.

2.3K Downloads

fabriclibrarytechnologyutility

Rent Server with this Mod

Screenshots

About this Mod

Codecium is a Fabric mod that vastly improves Codec error messages.
This mod was made because most of the current error messages are not useful at all.
The name is a play on the term Codec and the common use of periodic table elements for Minecraft mods.

Examples and Comparisons

Commands used:

/give @s minecraft:stick[minecraft:food={saturation: "text"}]
/item modify entity @s weapon {function: "minecraft:set_components", components: {"minecraft:rarity": "uncommon", "rarity": "rare"}}
/item modify entity @s weapon {function: "minecraft:set_enchantments", enchantments: {"minecraft:fake": "oops"}}

A comparison between error messages in vanilla and this mod.

Available Versions

Codecium 1.2.0 for 26.xrelease

MC 26.1-snapshot-1, 26.1-snapshot-2, 26.1-snapshot-3, 26.1-snapshot-4, 26.1-snapshot-5, 26.1-snapshot-6, 26.1-snapshot-7, 26.1-snapshot-8, 26.1-snapshot-9, 26.1-snapshot-10, 26.1-snapshot-11, 26.1-pre-1, 26.1-pre-2, 26.1-pre-3, 26.1-rc-1, 26.1-rc-2, 26.1-rc-3, 26.1, 26.1.1-rc-1, 26.1.1, 26w14a, 26.2-snapshot-1, 26.1.2-rc-1, 26.1.2, 26.2-snapshot-2, 26.2-snapshot-3, 26.2-snapshot-4, 26.2-snapshot-5, 26.2-snapshot-6, 26.2-snapshot-7, 26.2-snapshot-8, 26.2-pre-1, 26.2-pre-2fabric

January 26, 2026

Codecium 1.1.0 for 1.21.5-1.21.11release

MC 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10, 1.21.11fabric

April 1, 2025

Codecium 1.0.0release

MC 1.21.4fabric

February 26, 2025

How to Install Codecium on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (26.2-pre-2).

Install Mod

Open the mod browser in the dashboard and search for "Codecium". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

26.2-pre-2, 26.2-pre-1, 26.2-snapshot-8 (+38 more)

Server-side

~ Optional

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Codecium server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (26.2-pre-2). You can switch loaders with one click in the panel.

Is Codecium compatible with fabric?

Codecium officially supports fabric for Minecraft 26.2-pre-2, 26.2-pre-1, 26.2-snapshot-8. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Codecium – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Codecium consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.