event-catalog/eventcatalog

The open source documentation tool for software architectures.

A documentation tool designed for software architecture not generic pages.

Document systems, domains, services, messages and schemas. Document your architecture they way you build it.

Customize your documentation to fit your workflow. Automate it, customize it, visualize it.

40,000+ catalogs created

Documentation | Live Demo | Discord

npx @eventcatalog/create-eventcatalog@latest my-catalog

That's it. Open http://localhost:3000 and start documenting your architecture.

Looking for a guided walkthrough? Check out the Getting Started guide.

Document domains, services and messages across your architecture.

Ask questions about your architecture and business in natural language. The built-in AI chat and MCP server let you and your tools query your catalog.

Quickly find any schema across your catalog — OpenAPI, AsyncAPI, Protobuf, JSON Schema, Avro, and more. All in one searchable place.

Filter and find any property on any field across your entire catalog. See how fields are used across services and messages.

Attach architecture decision records, runbooks, and any custom documentation to your domains, services, and teams. Version them alongside your architecture.

Tell the end-to-end story of your business workflows. Reference the services and messages you already have to build a higher-level picture of how everything fits together.

• Version your resources — Full semantic versioning for events, commands, services, and more
• 15+ generators — Auto-generate from AsyncAPI, OpenAPI, Kafka, Confluent, AWS EventBridge, and more
• Customizable — Themes, custom MDX components, and configurable layouts
• Enterprise ready — OAuth2, RBAC, schema governance, breaking change detection

See EventCatalog powering real-world architectures: