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Tester Mod project artwork

CurseForge · Minecraft mod

Tester Mod

A damage testing tool for mod developers - spawn configurable tester entities to track and analyze damage output in real-time.

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which Tester Mod release should I use?

Updated today
Latest stable file tester_mod-1.2.1.jar
Game version 1.21.1
Loader NeoForge

Tester Mod tester_mod-1.2.1.jar targets 1.21.1 with NeoForge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.

Where it goes

Is Tester Mod required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say
Dedicated server Source doesn’t say
Loader for this release NeoForge
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does Tester Mod tester_mod-1.2.1.jar need?

tester_mod-1.2.1.jar. Change the file and its required mods may change too.

No extra mods listed for this file

This file does not list any required mods. Do not add a library just because a different file uses it.

This file does not list any required or optional mods.

Before you install it

Add Tester Mod without breaking your instance.

Built for Tester Mod tester_mod-1.2.1.jar. Pick another file and the loader, install side or required mods may change.

  1. 01

    Stick to this file

    Use tester_mod-1.2.1.jar. It targets 1.21.1 with NeoForge; another release may have different loader, side or dependency requirements.

  2. 02

    Bring the mods it needs

    This file does not list any required mods. Do not add a library just because a different file uses it.

  3. 03

    Put it on the correct side

    The project page does not say whether this file belongs on the client, dedicated server, or both.

  4. 04

    Pick the file you checked

    Use the “Get this file” button beside tester_mod-1.2.1.jar. It opens that exact file at the source.

About this project

What does Tester Mod add?

Tester Mod - Damage Testing Tool for Minecraft

Tester Mod provides configurable damage testing entities for Minecraft NeoForge 1.21.1, perfect for mod developers and players who want to analyze damage mechanics.

Key Features:

  • Advanced Damage Tracking: Spawn stationary tester entities that output detailed damage information in real-time, including raw damage, post-armor/resistance damage, and post-invulnerability damage.
  • Player Tester Mode: Players can now act as testers by right-clicking air with the Tester Setter to output damage they receive.
  • New Damage Output Format: [Entity Name] Damage: [Post-Mitigation Damage]/[Post-Invulnerability Damage]/[Raw Damage], Type: [Damage Type], Tick: [Game Tick]
  • Full Tester Configuration: Right-click a tester with the Tester Setter to open a GUI for configuring armor value, toughness, max health, knockback toggle, and whether to show zero-damage entries.
  • Player Tester Settings: Shift + right-click to configure invincibility toggle and zero-damage display.
  • Multi-Tester Support: Each tester displays its name prefix in damage output, allowing easy identification when testing with multiple entities.
  • Fire Resistance Integration: Testers with Fire Resistance effect automatically ignore fire-type damage.
  • Clean UI: Damage information appears as system messages, keeping the chat clean and focused.

How to Use:

  1. Obtain the Tester Setter from the Tools creative tab or with /give @s tester_mod:tester_setter
  2. Right-click a block to spawn a tester entity
  3. Attack the tester to see damage output
  4. Right-click the tester to open configuration GUI
  5. Right-click air with the Tester Setter to enable Player Tester mode
  6. Shift + Right-click air to configure Player Tester settings

Commands:

  • /removetester - Remove your testers
  • /removetester all - Remove all testers

Damage Output Format:

[Tester]: 2.0/2.5/8.0, Type: player, Tick: 54321

Perfect for:

  • Testing custom weapon damage
  • Debugging combat systems
  • Balancing modded content

Usage Notes:

  • Optimized for NeoForge 1.21.1
  • Open source with MIT license

Project description from CurseForge.

Pick your setup

Tester Mod by Minecraft version and loader

Choose the version and loader you play, then open the matching release.

1 available setups

Check the dependencies, then try the file in a copied instance before changing a world you care about.

Recent files

Tester Mod versions and loaders

6 of 6 releases match

Looking for an older file? The official CurseForge project page is in Resources.

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