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TMM datapack_extension

by YUN-SAN3

TMM datapack_extension lets server owners customize the game areas of the Train Murder Mystery mod through datapack JSON files.

FabricServer-side onlyAll rights reserved1.21.1

What it does

A datapack placed in the world's datapacks folder can set the player spawn, spectator spawn, ready area, play area and offset for each game area. Areas are defined in a custom areas.json file, and values in it replace the defaults of the original mod. Where a setting is absent, the original default values remain in use. The area reset template and area reset paste settings are configured the same way.

Following the required folder structure, a datapack can be built with custom configuration files and applied without touching the original mod code. Hot reload is supported, so changes take effect with a reload instead of a server restart. Wathe: Murder Mystery is bundled inside the mod, so the game it configures is included in the same package.

The mod runs on the server alone, so players join without installing it. It is published for Fabric only, for game version 1.21.1, with version 1.0.0 as the latest file released on 2025-12-07. The code is not open source; a public source repository exists, but the mod is released under All rights reserved.

Key features

  1. Datapack area configuration

    Game areas are set through datapack JSON files, so the layout can change without editing the mod.

  2. Spawn and play area settings

    Player spawn, spectator spawn, ready area, play area and offset are each configurable per area.

  3. Area reset templates

    Area reset template and area reset paste options let a map return to a saved state between rounds.

  4. Hot reload

    A reload applies datapack changes to running areas, so no server restart is needed.

Compatibility

Latest build for each game version and loader.

1.21.11.0.0
ReleaseBetaAlphaNot available

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

Requirements

Dependencies declared by the latest file for each loader.

Embedded 1

Wathe: Murder MysteryA murder mystery social game (core mod for the Last Voyage of the Harpy Express experience)
Embedded

Use cases

Custom maps for a server

A server owner can build a separate set of play areas and ready areas, then switch them in through a datapack.

Testing area layouts

Spawn and offset values can be adjusted and reloaded repeatedly while a map is being tuned.

Who it’s for: Server owners who run Train Murder Mystery on Fabric and want to change its game areas through datapacks rather than modifying the mod's code.

Questions

Does the mod need to be installed on clients?

No. It runs on the server alone, so players need nothing extra to join.

Where does the datapack go?

The datapack is placed in the world's datapacks folder, and its areas.json file defines the custom game areas.

Do changes need a server restart?

No. Hot reload is supported, so a reload applies the changes without restarting the server.

Which game version does the mod support?

Files are published for 1.21.1 only, with version 1.0.0 as the latest Fabric file.

What the author says

Allows customizing game area settings of the Train Murder Mystery mod through datapacks. Includes: Player spawn position, spectator spawn position, ready area, play area offset, play area, reset template area, and reset paste area.
YUN-SAN3, on the Modrinth page

Official listing

Owner
YUN-SAN3
Published
2025-12-07
Updated on Modrinth
2025-12-07
Facts verified
2026-10-15
Open on ModrinthCompare