Generator

Generator is a datapack for Minecraft chunk generation. To use it, place Pregenerator.zip in the world's datapack folder and enable it with the datapack enable command. The pack ships as a datapack, so the mod loader itself is not part of the install beyond the mod loader the world already uses. Once enabled, the world starts and the pregeneration can be launched from in game.

Pregeneration matters because many players exploring new land at once force the server to create chunks on the spot, which causes lag. Generator moves that work ahead of time, and the effect is most noticeable on servers with slower hardware. The pack is compatible with Realms. Start the job as a server administrator, set the size in blocks and a direction (north, east, west or south), and generation stops once the desired size is reached. Progress is shown on a scoreboard, which can be removed when no longer needed. Generation can be raised to a faster pace than the default, with 2 recommended by the author, and the chat reports when everything is done.

Only the server needs Generator: it runs on the server alone, and players may join without installing it. It is released under the MIT License and is open source. Files are published for Fabric, Forge, NeoForge and Quilt, as a data pack for the same worlds, and the latest build is 12+mod for 26.3, dated 2026-09-18. The game versions cover 1.14.4 – 26.3 with 44 release versions and snapshot builds.