UtilitiesForProgrammers

A client-side mod that adds tools to help you learn and understand programming concepts inside Minecraft — visualize coordinates, track block updates, overlay a coordinate-axis grid, and keep the game visible while you work in another window.

Client-side only. No server installation required. Works on vanilla servers.

Features

	Feature	Description
🧭	HUD	Displays absolute coordinates, facing direction, and target-block info (block ID + block-state properties) in the top-left corner
🟥	Block Update Highlight	Colors blocks by placement order (newest = red → oldest = blue) and fades them out over time. Detects updates from the server via mixin — works even on vanilla servers
🎯	Target Highlight	Stronger outline + translucent fill on the block you're looking at
📐	Coordinate Grid	1-block-unit grid around the player with origin-anchored axis arrows (+X = red, +Z = blue)
🪟	Window Controls	Render while unfocused, always-on-top toggle, focus-border indicator, and External Operation Mode

Keybindings

Default keys are unbound in vanilla 1.21.10 and will not conflict with normal gameplay. All bindings can be changed in Options > Controls.

Key	Action
`H`	Toggle all mod features on/off at once
`K`	Toggle External Operation Mode

External Operation Mode (`K`)

Designed for studying code in an editor while referencing Minecraft at the same time:

Releases the mouse cursor so you can click in other windows
Stops player movement input
Blocks all click actions (attack, place, pick) to prevent accidental changes
Freezes HUD values and highlight timers so you can copy coordinates or observe block states without them updating

Configuration

Enable/disable each feature and tweak highlight colors, fade duration, grid size, and more:

config/utilitiesforprogrammers-client.toml

Changes apply without restarting the game.

Requirements

Minecraft 1.21.10
NeoForge 21.10.x

Source & Issues

GitHub — osad-sakana/utility-for-programmers