JS Expanded
by Collinvh
JS Expanded is a Fabric and NeoForge mob mod for 1.21.1 that serves as an expansion pack and content example for building add-ons on top of JurassicSaga.
What it does
Players who want more creatures alongside JurassicSaga can add this expansion, which supplies franchise-based mobs balanced around vanilla progression. The author describes it as a set of examples showing how to build a further expansion on JurassicSaga, so its content doubles as a reference for modders. JurassicSaga is required, and the expansion works properly only when paired with it.
Installation is needed on both sides: the server and every player run the mod in the client and server environment. Builds exist for Fabric and NeoForge on 1.21.1 only, with the latest Fabric file 0.1 and the latest NeoForge file 0.1.1. The mod is open source under the GNU General Public License v2.0 only, and its source code and issue tracker are public. Content changes between versions, so updates can add or alter creatures.
Key features
Moon Spiders
The expansion includes Moon Spiders among its example creatures, shown as a model for new mobs.
Franchise-based mobs
Creatures are drawn from specific franchises and tuned so they fit within vanilla main-mod progression.
Expansion example
The content demonstrates how an add-on can be built on top of JurassicSaga, for modders learning the structure.
Example creatures
Several example creatures are included to show the range of mobs an expansion can carry.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Extending JurassicSaga
A server running JurassicSaga can add this expansion to introduce more creatures into the same world.
Learning add-on structure
Modders can read the expansion's content as a working example before creating their own pack on JurassicSaga.
Who it’s for: The mod suits players who already run JurassicSaga and want additional mobs, and modders who plan an expansion built on the same base.
How it compares
Spider Moon 2 is a Fabric and NeoForge mob mod for 1.21.1 that is client and server, but its license is All rights reserved and its source is not open source. Draconic Archer's Moon Bundle, Ender Moon 2, Black Moon 2 and Hunter's Moon 2 share the same loaders, version and environment, and all are under All rights reserved and not open source, while JS Expanded is open source under the GNU General Public License v2.0 only.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| JS Expanded | Fabric and NeoForge | 1.21.1 | Client and server | 2026-05-04 |
| Spider Moon 2 | Fabric and NeoForge | 1.21.1 | Client and server | 2026-08-15 |
| Draconic Archer's Moon Bundle | Fabric and NeoForge | 1.21.1 | Client and server | 2026-01-31 |
| Ender Moon 2 | Fabric and NeoForge | 1.21.1 | Client and server | 2026-08-15 |
| Black Moon 2 | Fabric and NeoForge | 1.21.1 | Client and server | 2026-08-15 |
| Hunter's Moon 2 | Fabric and NeoForge | 1.21.1 | Client and server | 2026-09-01 |
Questions
Does JS Expanded need JurassicSaga?
Does the server need JS Expanded?
Which loaders are supported?
In the catalog
JS Expanded is one of 11,058 Mobs mods on ModsFinder, and one of 5,189 Mobs mods for Fabric. 32,366 mods support Minecraft 1.21.1.
More from Collinvh
Similar mods
What the author says
Some example creatures include: - Venatosaurus - Piranhadon - Moon Spiders - Bloodfish
Official listing
- Modrinth page
- modrinth.com/mod/js-expanded
- Owner
- Collinvh
- Published
- 2025-12-29
- Updated on Modrinth
- 2026-05-04
- Facts verified
- 2026-10-15