Develop

An open schema, a typed REST API, and an SDK. Build viewers, importers, games, or app backends: the world is the database.

The stack

schema

Schema

22 element types, versioned in the open. The language itself.

 api

API

Typed REST, every route live, free, documented.

 integration_instructions

SDK

@onlyworlds/sdk: typed access to every element and endpoint.

 menu_book

Docs

The full developer reference: guides, endpoints, patterns.

Build with AI

In your browser

Hand Claude, ChatGPT, Gemini and friends the LLM guide, one text file that teaches the whole standard, and describe your project or ideas.

OnlyWorldsBot is a custom ChatGPT that knows the schema and infrastructure.

On your computer

Claude Code or Codex plus the toolkit: migrating, modeling, and the API at fingertips (handle with care).

The MCP server can also provide the schema and manage worlds through API, credentials optional.

Keys

Worlds can be reached through keys, minted in your account.

  • ow_w_# reads and writes a world.
  • ow_r_# reads only. Safe to share, no PIN needed.
  • ow_a_# account token: authenticates an app to list an account's worlds and mint keys.

Keys are scoped per world and shown once at creation.

More details in the developer docs. Feedback welcome on the public tracker.