Menu

mod

PortalJSMinecraft mod for 1.21.4

Ability to create custom portals with KubeJS

client and servernewest supported release 1.21.4Game Mechanics
Latest version
1.21.1-1.1.0
Minecraft
1.21 to 1.21.4
Java
Java 21+
Loader
NeoForge
Licence
GPL-3.0-or-later
Downloads
2.7k
Updated
2 mo ago
Available on
Modrinth
Space NodeOur hosting

Host PortalJS servers

One click and PortalJS is installed with the right loader, on hardware built for it.

  • 1.21.4
  • NeoForge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version PortalJS declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.4NeoForge21+declared3 Dec 2024
1.21.3NeoForge21+declared23 Oct 2024
1.21.2NeoForge21+declared22 Oct 2024
1.21.1NeoForge21+declared8 Aug 2024
1.21NeoForge21+declared13 Jun 2024

Download

From PortalJS’s own host. Nothing is re-hosted here.

Most recently published release

1.21.1-1.1.0release5 Mar 2025

portaljs-1.21.1-1.1.0.jar · 0.2 MB · for 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21 · NeoForge

Download this release
cc12af343446…
Older versions4
  • 1.21.1-1.0.327 Feb 20251.21.10.2 MB225 downloads59000e37cb2f…Get
  • 1.21.1-1.0.227 Feb 20251.21.10.2 MB90 downloadse1128bab4b5b…Get
  • 1.21.1-1.0.125 Feb 20251.21.10.2 MB117 downloadsa8c4aa1b5ca4…Get
  • 1.21.1-1.0.024 Feb 20251.21.1, 1.210.2 MB106 downloadsea59c9e4cf1a…Get

Frequently asked

Does PortalJS work on Minecraft 1.21.4?

Yes. 1.21.4 is the newest Minecraft version PortalJS declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does PortalJS support?

Everything the author has declared, from 1.21 up to 1.21.4. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install PortalJS on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does PortalJS support?

NeoForge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for PortalJS?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

What licence is PortalJS under?

GPL-3.0-or-later, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install PortalJS?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download PortalJS safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

Armor HiderHide or adjust the transparency of armor, glint, and offhand items - with full multiplayer sync. No dependencies required.Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftArchitectury APIAn intermediary api aimed to ease developing multiplatform mods.Jade 🔍Shows information about what you are looking at. (Hwyla/WAILA fork for Minecraft 1.16+)Collective🎓 Collective is a shared library with common code for all of Serilum's mods.sparkspark is a performance profiler for Minecraft clients, servers and proxies.

Details from Modrinth, where the author last updated it on 1 Aug 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .