Mob Spawn Indicator
Highlights block surfaces where hostile mobs can spawn using color-coded overlays
NeoForge
- Loaders
- NeoForge
- Downloads on Modrinth
- 480
- Followers on Modrinth
- 0
- version
- 1
- Updated
- June 27, 2026Jun 27
- Published
- in 2026
Preview 2 · swipe
At a glance
Runs on NeoForge
For Minecraft 1.21.1
Client only — no need to install it on the server
Latest version — 1.0.0 from June 27, 2026
License LGPL-3.0-only — free
Where it's neededGame versions1.21.1
In gamerequiredOn servernot needed
Install in the game only; not needed on the server
Mob Spawn Indicator highlights valid mob spawn floors in your vicinity with color-coded overlays. It uses vanilla spawn rules, so it works on any server without needing to be installed server-side.
Features
- Color-coded overlays on valid spawn floors: red (danger), yellow (warn), green (safe)
- Configurable render distance, opacity, and which colors to display
- Settings GUI accessible from the Options screen or via commands
- Client-side only — works on vanilla servers, SMPs, and modded servers
Commands
/msi settings— open the settings GUI/msi toggle— toggle the overlay on/off/msi on|/msi off— enable or disable the overlay/msi reset— reset all settings to defaults
Configuration
Default keybind: J (toggle overlay)
Config file: config/msi-common.toml
| Option | Default | Description |
|---|---|---|
render_rad | 16 | Render distance in blocks |
overlay_opacity | 0.5 | Overlay transparency |
show_danger | true | Show red overlay (valid spawn, no space for mobs) |
show_warn | true | Show yellow overlay (valid spawn, 1 block space) |
show_safe | false | Show green overlay (valid spawn, 2+ block space) |
Notes
- Uses vanilla Minecraft spawn rules: slabs, stairs, trapdoors, glass, and leaves are correctly excluded as non-spawnable
- Overlays update every 5 ticks
- Works in singleplayer, LAN, and multiplayer
FAQ
How to install Mob Spawn Indicator?
Install NeoForge for your Minecraft version, download Mob Spawn Indicator for the same version and loader, put the file into the mods folder and launch the game with the loader profile.
Which Minecraft versions does Mob Spawn Indicator support?
Mob Spawn Indicator has builds for Minecraft 1.21.1.
Is Mob Spawn Indicator needed on the server?
Client only — no need to install it on the server
License and source
GNU Lesser General Public License v3.0 onlyfree to use and share; changes to the mod itself must be published under the same license
