How do I install JavAlert?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. Opens on Modrinth — not every file is mirrored on our own servers.

What Minecraft version does JavAlert work with?

The listing gives Minecraft 1.21.1. This is the version stated by the author or source site, not something we verified ourselves.

Home›Java›Mods›JavAlert

ModsJava

JavAlert

by Ryvione · on Modrinth

Send native OS alerts and notifications to players! Perfect for trolling friends, server announcements, quest systems, and automated interactions. Alerts…

⬇ Download on Modrinth

Open in MC Java Mods Get it on Google Play →

JavAlert

Send native OS alerts and notifications to players! Perfect for trolling friends, server announcements, quest systems, and automated interactions. Alerts appear outside the game as real system notifications on Windows, macOS, and Linux.

Full documentation: Wiki

Features

Native System Notifications - Real OS notifications outside the game
Message Boxes - Native dialog boxes (Windows, macOS, Linux)
Custom In-Game Screens - Beautiful custom alert screens with buttons
Alert Beacon Block - Automatically trigger alerts when players enter detection radius
Conditional Triggers - Trigger based on inventory, stats, location, biome, and more
Templates - Save and reuse alert configurations
Multi-Language Support - English, Spanish, French, German
API Integration - Comprehensive API for mod developers

Quick Start

Place an Alert Beacon block in your world
Right-click to configure radius, message, and display type
Set trigger mode (ENTER, EXIT, STAY, PROXIMITY, PORTAL)
Add conditions and filters (optional)
Save and players will receive alerts automatically!

Commands

/alert <target> simple <message> - Simple alert
/alert <target> messagebox <title> <message> - Messagebox alert
/alert <target> notification <message> - Notification alert
/alert <target> customscreen <title> <primaryButton> [secondaryButton] <message> - Custom screen
/alert manage - Management GUI (OP Level 5)
/alert documentation - In-game documentation

API for Mod Developers

See API Documentation.

Installation

Download JavAlert-1.2.jar from Modrinth
Place in your mods folder
Restart Minecraft

Configuration

Access configuration via the "JavAlert Config" button on the main menu (icon next to Singleplayer button).

Documentation

Complete documentation: Wiki

You can also use /alert documentation in-game for interactive documentation.

Technical Details

Minecraft: 1.20.1
Forge: 47.4.13+
Java: 17+

Developer note :

This is my first Minecraft mod, so i am just testing things with this mod and other mods are coming soon !

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft version listed: 1.21.1
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

Verified by MCModsHub

Ships as JavAlert-RELEASE-NeoForge-1.21.1-1.2.jar — drop this file into the mods folder
Download size: 248 KB
Download link checked 6 Sept 2026 — working

These come from our own check of the pack file, not from the source page.

Explore more

All Mods for Java All Minecraft Java mods Java mods for 1.21