A fork of Mozilla's Rhino library, modified for use in mods
A fork of Mozilla's Rhino library, modified for use in mods. This library adds JavaScript engine Rhino that supports ES6 and doesn't depend on built-in Nashorn engine that got removed in Java 15.
This mod doesn't do anything on it's own, it's a library used by KubeJS.
ABOUT THIS LISTING
This page describes Rhino by Lat. The description and screenshots are the author's own, imported from their listing on Modrinth on 24 October 2026: https://modrinth.com/mod/rhino
Mythiq.net hosts no files for it. The download button goes straight to the release file on cdn.modrinth.com, so you are downloading from the author's own host, not from a copy of ours.
The download count, rating and comments on this page start at zero and count Mythiq.net only. The source's own figures are not copied here — they measure a different site, and a number that cannot be checked against our own ledger is not worth printing.
Requirements
Game versions
26.1.2
1.21.4
1.21.3
1.21.2
1.21.1
1.21
MOD LOADER
This release is built for Neoforge. A mod built for one loader will not load under another — Fabric mods do not run on Forge, and vice versa.
GAME VERSION
Built for Minecraft 26.1.2, 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21. Minecraft mods are tied to an exact version: a 1.21.4 build will refuse to load on 1.21.5.
THIS IS A LIBRARY
On its own it adds nothing you can see. It is here because other mods require it, and installing it is usually something another mod asked you to do.
DEPENDENCIES
Check the author's listing for required libraries before you start the game — a missing dependency shows up as a crash on launch, not as a warning.
Installation
1. Install Neoforge for the Minecraft version you play, if you have not already.
2. Download the .jar with the button on this page. Do not unzip it — a mod jar is installed as it is.
4. Launch the game with the Neoforge profile selected.
ON A SERVER
Anything that changes world generation or gameplay has to be installed on the server as well as on every client. Client-side visual and interface mods do not.
UPDATING
Replace the old .jar rather than adding the new one beside it. Two versions of the same mod in the folder is a crash on launch.
This release downloads from cdn.modrinth.com, not from us, so
there is no checksum to compare against. Scan the archive before you unpack it.
Note: This release is a major update to Rhino's internals and contains a bunch of new or fixed language features, including:
- Destructuring const {a, b} = obj, const [x, y] = arr, defaults, nested patterns, destructuring in catch, for loops, and function parameters
- Default parameters function f(a, b = a 2)
- Rest parameters function f(...args) (unfortunately NYI in arrow functions, also no spread yet!)
- Nullish coalescing (??) and optional chaining (?.), hopefully working this time :p
- Computed properties in object literals {[key]: value} (i didn't even know this wasn't supported until a few days ago tbh...)
- Tagged string literals
- more JS builtins like Array.flatMap, impls of values/entries/fromEntries for Object, and more
- Changes to iterators where we basically just copy what upstream Rhino does tho; beware of this change especially since it may have either fixed or broken some for...in or for...of loops (also no, unfortunately variable scoping is not fixed yet)
If anything breaks, addons may need to be updated, otherwise, feel free to report issues directly to us on our Discord!
Off-site on cdn.modrinth.com —
no checksum, because we never held this file.
Link checked by our review team on 25 Oct 2026.
Tell us if something is wrong — a file that will not work, content taken from
someone else, or anything that looks unsafe. Reports go to our review team, not
to the author.
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