Server-authoritative Java 21 + Spring WebFlux (Netty) backend, React + Phaser (TypeScript) client, in-browser map editor. Save 180–320 hours of engine work and ship your MMO faster.
One-time $99 (first 1000 buyers) • Commercial use • Email support • Bug-fix maintenance
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Just make a git clone and start developing your browser MMORPG or other online game
Networking, editor, movement, combat, AI, persistence — the unsexy plumbing is already solved.
Threading, backpressure, serialization patterns that survived real iteration — not just boilerplate.
Spend your time on maps, classes, skills and quests — not foundations.
This kit bakes in months of research, hundreds of experiments, and the painful dead-ends. You don’t reinvent the networking or editor — you understand the solution, then adapt or extend it. Result: drastic time savings and fewer production surprises.
Estimates (180–320h) come from typical solo-dev builds; exact savings depend on your content scope.
A practical tally of tasks you usually have to build from scratch. Add your features on top — don’t rebuild the base.
Paint tiles, place obstacles, set movement speeds — and autosave to Mongo. Build content, not tools.
Spring WebFlux on Netty: managers for movement and combat, clean ports & adapters.
React + Phaser with clean, testable classes and an event bus to keep UI and canvas in sync.
Actions schedule follow-ups (start/finish march, etc.) for smooth realtime without a classic tick loop.
Every command is its own byte; less overhead than JSON.
Flow control to keep your realtime stable under load.
Desktop-first canvas gameplay + modern UI panels.
Paint terrain, place obstacles; autosave to Mongo.
Domain core with ports & adapters on Spring WebFlux.
Compose up with local Mongo; or point to Mongo Atlas.
Two mobs with simple AI, basic combat & skills, item drag, terrain speed.
Registration, login, session handling included.
Stand up an MMO foundation fast and iterate on content.
Split work between content, client UI and server logic.
Prototype a 2D MMO quickly before investing in a custom engine.
Cost: time + uncertainty
Cost: ecosystem constraints
Cost: one small purchase
Hi, I’m Michał 👋 — a full-stack developer with over 9 years of commercial experience. In 2024 I was bored of yet another business app and wanted to chase a childhood dream: a simple MMORPG. I chose tech I use and trust daily: Spring WebFlux on Netty, React and Phaser. The result is this starter — I even reused it for another online game and saved weeks.
Follow me on X (Twitter)No subscriptions. Pull fixes via Git when available.
launch price • first 1000 buyers
One-time payment • Secure Stripe checkout
At $50/h, saving 180–320h is $9,000–$16,000 in avoided work. Pay once — keep shipping.
Not yet — it’s optimized for desktop browsers. On mobile, users see a 'desktop only' message.
Yes. Keep this server and implement your own desktop/mobile client that speaks to it.
Yes. The event-driven server can be adapted for co-op RPGs, arenas, survival or other real-time games with your custom logic.
Mid-level Java 21 + Spring WebFlux and React/TypeScript.
Yes. The data layer is decoupled — point it at any Mongo instance or replace it with another store.
Run `docker compose up` (local Mongo) or set `MONGO_URI` to Atlas and start coding.
Frontend fits Vercel/Netlify; backend runs on Heroku, Fly.io, AWS — set your cloud Mongo URI.
I don’t promise continuous feature development, but I fix reported bugs and ship patches via Git.
Absolutely. Commercial use is included, no royalties.
Yes — 14-day refunds for any reason. If refunded, your commercial license is revoked and your access to updates & support ends.
Lifetime single-user license. For team/studio licenses, contact me.
Not a fully-fledged MMO with content. It’s a source-available starter kit: networking, core systems, editor, and example content to build upon.
Please try the public demo before purchasing.
