Extension
by Octal
Extension, a Fabric server mod by Octal, adds placeholders, nicknames and gamerules that server owners can use in chat and commands.
What it does
Extension works on Fabric and is server-side only, so players join without installing it. It is open source under the MIT License and published for 1.17 – 1.18.2 with four release versions, 1.17, 1.17.1, 1.18 and 1.18.2. Its latest file is 1.5+1.18.2, published on 2022-03-19.
The mod provides a Namespace Extension placeholder set with the ext prefix, and a nickname feature that exposes a player's nickname through a placeholder. Gamerules follow the Extension name pattern in lowercase, and the rules cover villager trades restocking instantly, item cooldowns, ender pearl cooldowns and chorus fruit cooldowns. A rule can also disable mutually exclusive enchantments. Styled Chat is an optional dependency that can pick up the placeholders in chat formatting.
Key features
Namespace placeholders
Placeholders under the ext namespace return values that other text and chat formatting can display.
Nickname placeholder
A placeholder reads each player's nickname, so formatted output can show it in place of the account name.
Cooldown gamerules
Separate gamerules toggle cooldowns for items, ender pearls and chorus fruit.
Villager trade restock
A gamerule decides whether villager trades restock instantly instead of on the usual schedule.
Compatibility
Latest build for each game version and loader.
This mod also publishes snapshot builds. Snapshots are not shown in the matrix.
Requirements
Dependencies declared by the latest file for each loader.
Optional 1
Use cases
Chat formatting on servers
Server owners can combine the placeholders with Styled Chat to show nicknames and other values in chat lines.
Tuning survival rules
Gamerules for cooldowns and villager restocking let server owners change pacing without editing game code.
Who it’s for: Server owners who want placeholders and gamerules for chat or survival pacing. Players join without installing the mod.
How it compares
Lanitium is a Fabric server-side mod under the Apache License 2.0, published for 1.20.5 – 1.21.4, so it covers a different version range than Extension. NickName Changer is client-side only and not open source; it targets 1.21 – 1.21.11 and changes nicknames on the client instead of exposing them on the server.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Extension | Fabric | 1.17 – 1.18.2 | Server-side only | 2022-03-19 |
| Lanitium | Fabric | 1.20.5 – 1.21.4 | Server-side only | 2025-05-11 |
| NickName Changer | Fabric | 1.21 – 1.21.11 | Client-side only | 2026-07-11 |
Questions
Does Extension need to be installed on the client?
Which loader does Extension use?
Does Styled Chat have to be installed?
In the catalog
Extension is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 9,044 mods support Minecraft 1.18.2.
More from Octal
Similar mods
Official listing
- Modrinth page
- modrinth.com/mod/ext
- Owner
- Octal
- Published
- 2021-05-24
- Updated on Modrinth
- 2022-03-19
- Facts verified
- 2026-10-15