ModsFinder

Codecium

by ErrorCraft

Codecium is a Fabric library that rewrites the error messages produced when a Codec fails to parse data.

FabricClient or server, optionalMIT LicenseOpen source1.21.4 – 26.3

What it does

Codecium replaces the default Codec error output with clearer messages, so a failed parse points to the field and value that caused it. The author built it because the stock messages are often hard to act on when a datapack or mod reads its own data. Codec is a common way for Minecraft mods to define periodic table elements and other structured data, and that is where these messages usually appear. Files are published for Fabric for 1.21.4 – 26.3, with 1.2.2+26.3 as the latest build for 26.3, and the mod is open source under the MIT License. It can run on a client alone, a server alone or both, and neither side needs it.

Key features

  1. Clearer Codec errors

    Parse failures are reported with more useful messages than the default Codec output provides.

  2. Field-level detail

    Messages aim to show which part of the data failed, so the source of a problem is easier to find.

  3. Library for other mods

    Other mods that use Codec benefit from the rewritten messages without changing their own data definitions.

Compatibility

Latest build for each game version and loader.

26.x5 of 5 versions with builds
26.31.2.2+26.3
26.21.2.0+26.1
26.1.21.2.0+26.1
26.1.11.2.0+26.1
26.11.2.0+26.1
1.21.x8 of 8 versions with builds
1.21.111.1.0
1.21.101.1.0
1.21.91.1.0
1.21.81.1.0
1.21.71.1.0
1.21.61.1.0
1.21.51.1.0
1.21.41.0.0
ReleaseBetaAlphaNot available

This mod also publishes snapshot builds. Snapshots are not shown in the matrix.

How it compares

Full comparison

Codec2Schema is also a Fabric library under the MIT License, open source, with files for 1.21.11 – 26.3 and the same optional environment. zNBTEditor is a Fabric tool under the MIT License that is not open source, covering 1.21.11 – 26.2. DevKit API is open source under the Apache License 2.0 but needs both client and server, and its files cover 1.21.1 – 1.21.11.

ModLoadersGame versionsEnvironmentUpdated
CodeciumFabric1.21.4 – 26.3Client or server, optional2026-07-22
Codec2SchemaFabric1.21.11 – 26.3Client or server, optional2026-10-07
zNBTEditorFabric1.21.11 – 26.2Client or server, optional2026-07-01
DevKit APIFabric1.21.1 – 1.21.11Client and server2026-09-01

Questions

Does Codecium need to be installed on the server?

No. It works on either side, and neither the client nor the server needs it, so it can run on one side alone or on both.

In the catalog

Codecium is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 8,071 mods support Minecraft 26.3.

Library mods3,514Fabric modsMods for 26.38,071

More from ErrorCraft

All projects
Itematic1.20.5 – 26.3Entity Modifiers1.17 – 1.19Text Builders1.18.1MixedList1.21.4

Similar mods

Fabric API1.14 – 26.3Cloth Config API1.14 – 26.3YetAnotherConfigLib (YACL)1.19 – 26.3Architectury API1.16.5 – 26.3Just Enough Items (JEI)1.8 – 26.3Geckolib1.12.2 – 26.3

What the author says

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.
ErrorCraft, on the Modrinth page

Official listing

Owner
ErrorCraft
Published
2025-02-26
Updated on Modrinth
2026-07-22
Facts verified
2026-10-15

Tags

LibraryTechnologyUtility
Open on ModrinthCompare