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Box Outlines Api

by Spit365

Box Outlines Api is a Fabric library for drawing outlined boxes in the world, with server commands that control the client-side rendering.

FabricClient and serverMIT LicenseOpen source1.21.6 – 26.2

What it does

Box Outlines Api lets a server summon box outlines that appear on the screens of players who have the mod installed. The client-side rendering is driven by server-side commands, so a server owner can control which boxes are drawn without each player changing anything. Box colors are given in hexadecimal format, such as 0xFFFF0000 for full-opacity red, and rendering persists across ticks through a tick callback.

The mod depends on Fancy some client tweaks? and needs it installed alongside. Servers that run it need every player to install it too. Files are published for Fabric only, for seven release versions, 1.21.6 – 26.2, under the MIT License, and the code is open source with the source code on GitHub.

Developers can use the mod as a library: its methods are included in the project directory and can be called from other Fabric mods. Installation follows the standard Fabric loader process, and the official Fabric wiki covers the general steps for modding with Fabric.

Key features

  1. Server-controlled outlines

    Server-side commands summon and control box outlines that the client renders.

  2. Hexadecimal box colors

    Colors are set in ARGB hexadecimal, so 0xFFFF0000 gives full-opacity red.

  3. Continuous rendering

    A tick callback keeps outlines drawn across ticks until they are removed.

  4. Developer methods

    The mod's methods are available to other Fabric mods that want to draw outlines.

Compatibility

Latest build for each game version and loader.

26.21.0.0-26.2
1.21.111.0.0
1.21.101.0.0
1.21.91.0.0
1.21.81.0.0
1.21.71.0.0
1.21.61.0.0
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 1

FS
Fancy some client tweaks?Adds Cosmetics, new death particles and some pvp utils
Required

Use cases

Server-marked locations

A server can outline areas or blocks for players to find during events or minigames.

Mod integration

Other Fabric mods can call the library to add outline rendering without writing their own client code.

Who it’s for: Server owners who want to show outlines to players, and developers of Fabric mods that need box outline rendering.

How it compares

Full comparison

Box Outlines Api is client and server and open source under the MIT License, for 1.21.6 – 26.2 on Fabric. Toggle highlight outline box is client-side only and open source under the MIT License, for 1.21.11 – 26.3 on Fabric. Outline Mod (Action & Stuff) is client-side only, released under All rights reserved, and covers 1.21.1 – 1.21.5 on Fabric.

ModLoadersGame versionsEnvironmentUpdated
Box Outlines ApiFabric1.21.6 – 26.2Client and server2026-07-20
Toggle highlight outline boxFabric1.21.11 – 26.3Client-side only2026-10-03
Outline Mod (Action & Stuff)Fabric1.21.1 – 1.21.5Client-side only2025-06-09

Questions

Does Box Outlines Api need Fancy some client tweaks??

Yes. Fancy some client tweaks? is a required dependency and has to be installed next to Box Outlines Api on Fabric.

Does the server need Box Outlines Api installed?

Yes. Every player and the server need a copy of the mod.

Which game versions does Box Outlines Api support?

Files cover 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10, 1.21.11 and 26.2. The latest Fabric file is 1.0.0-26.2 for 26.2, published 2026-07-20.

More from Spit365

All projects
FSFancy some client tweaks?1.21.6 – 26.2Coins and Stuff1.20.1

What the author says

This is an api for one of my other mod client-tweaks. It allows the server to summon box outlines from client-tweaks for a tick to those with both mods installed.
Spit365, on the Modrinth page

Official listing

Owner
Spit365
Published
2026-04-21
Updated on Modrinth
2026-07-20
Facts verified
2026-10-15
Open on ModrinthCompare