Minecraft launcher support

Every project page has an Install with a launcher panel with step-by-step instructions for the launcher you use. Here's the overview.

Prism Launcher / MultiMC

Modpacks: Add Instance → Import → paste a modpack's file URL (the Copy URL button on any project) or choose a downloaded .mrpack/.zip. Mods, resource packs, shaders: Edit instance → the matching tab → drag the file in.

Modrinth App

Import uploaded .mrpack modpacks via Create instance → Import. (Packs from the pack builder link to files hosted here, which the Modrinth App may refuse — use Prism for those.) Drag individual files onto an instance's Content page.

ATLauncher

Use the Import tab with a downloaded .mrpack or .zip. Individual files go in the instance folder (Open Folder).

CurseForge App

Open a profile's folder and drop files into mods/, resourcepacks/ or shaderpacks/.

Official Minecraft Launcher

Install Fabric/Forge/NeoForge with its installer, then copy files into .minecraft/mods (or resourcepacks, shaderpacks).

Build a modpack

Pick mods, resource packs and shaders from the store, choose a Minecraft version and loader, and download a standard .mrpack. The pack references files by URL and SHA-1/SHA-512 hash, so launchers verify every download.

Open pack builder

Building a launcher?

Use the Launcher API to put a full Jace Store browser inside your launcher: search, one-call install resolution and batch update checks.

Launcher API docs

Public API

A read-only JSON API modelled on Modrinth's v2 API, so launcher and update-checker code written for Modrinth can point at this store by changing the base URL. No key needed; CORS is open.

https://jace-store-deb.vercel.app/api/v2

GET/search?query=sodium&facets=[["project_type:mod"],["versions:1.21.1"]]&limit=10Search projects (Modrinth facet syntax)

GET/project/{id|slug}Project details

GET/projects?ids=["slug-a","slug-b"]Several projects at once

GET/project/{id|slug}/version?loaders=["fabric"]&game_versions=["1.21.1"]List versions, filterable

GET/version/{id}One version with files and hashes

GET/version_file/{sha1}?algorithm=sha1Identify a file on disk by hash

POST/version_files {"hashes":[…],"algorithm":"sha1"}Identify many files at once

POST/version_file/{sha1}/update {"loaders":[…],"game_versions":[…]}Check a file for updates

GET/tag/{game_version|loader|project_type|category}Tag lists

File URLs in responses go through /api/download/{fileId} (counts the download, then redirects). Each file also has direct_url. Modpacks: GET /api/mrpack?v={versionIds}&mc=1.21.1&loader=fabric&loader_version=…