Metaverse Game is a real-time multiplayer backend powering a 3D virtual world where users join spaces, customize avatars, and interact with each other live. It's fully tested, containerized, and enforces role-based access throughout.

The problem: Multiplayer backends require solving real-time sync, access control, avatar state, and space management all at once. I built this to prove those problems are solvable cleanly — with a proper test suite to back it up.

What I built:

— JWT auth with role-based access control: admins create/delete spaces and elements; users join, move, and interact

— Space management with full CRUD and authorization enforcement

— Avatar creation, metadata storage, and customization with unauthorized deletion blocked at the route level

— WebSocket-powered real-time layer: position updates broadcast to all users in a space, with graceful disconnect

— Zod schema validation on all inputs

— Prisma ORM + PostgreSQL for relational data across users, spaces, avatars, and elements

— Docker containerization — runs anywhere

— Full Jest test suite: 4 suites, 15 tests covering auth, spaces, avatars, and WebSocket edge cases

Impact: 15 tests passing across 4 test suites. Role-based access enforced at route level. WebSocket broadcast confirmed end-to-end in tests. Zero environment setup friction — fully Dockerized.

Stack: Node.js · TypeScript · Express.js · WebSockets · Prisma · PostgreSQL · Zod · Jest · Docker