LosaDev Tools

Lost Saga modding tools that run in the browser: https://tools.losadev.wiki

Open a game folder, browse and edit .iop packs, preview models, animations, effects, maps, UI windows and textures, look up items, heroes, costumes and quests, and encode/decode server values. Game files never leave your PC: everything runs in your browser tab, and changed packs come back as downloads.

Guides for every tool: https://losadev.wiki/tools/overview/ · tutorials: https://losadev.wiki/tools/tutorials/

Run it locally

Requirements: Node.js 20 or newer.

cd app
npm install
npm run dev        # http://localhost:4700

npm run build writes the static site to app/dist/; npm start serves it with the small server in app/server.mjs (port and address in app/.env, see app/.env.example and app/DEPLOY.md).

The folder picker needs a Chromium-based browser (Chrome, Edge) on HTTPS or localhost.

Layout

Path	What
`app/src/`	The app: game folder, worker with the pack reader (`src/worker/`), IOP Manager (`src/iop/`), Encode / Decode (`src/cipher/`), workbench layout (`src/legacy/workbench.*`)
`app/public/legacy/`	Tool views shared with the desktop LS Tools. Generated: change them through `app/tools/legacy-patches.mjs`, then `node tools/extract-legacy.mjs`
`app/tools/`	Build helpers (legacy extraction, handler generation)

Contributing

Pull requests are welcome and count toward your LosaDev tier: fixes, new file formats, better previews, UI work, tutorials. Read https://losadev.wiki/contribute/how-to/ first.

One change per pull request, with a short description and how you tested it (which client year, which pack).
Never commit game files, packs, or passwords of your own server. The built-in pack passwords are the defaults from the shared sources.
Pull requests are reviewed and merged by the Core team.

Lost Saga is the property of its publishers. This project is fan-made, for development and preservation, and not affiliated with them.