tool.ren

AsyncAPI Contract Workbench

Inspect AsyncAPI 2.x and 3.x documents locally, summarize servers, channels, operations and messages, visualize event flows, and draft a 3.1 migration.

Contracts are parsed locally with no broker connection
Documents, server URLs, channel names, message payloads and filenames never enter anonymous analytics. External references are reported but never fetched.

Current and baseline contracts

Each document is limited to 3 MiB, 2,000 channels, 5,000 operations or messages, and 100,000 syntax nodes.

Load a sample or paste an AsyncAPI contract

Validation findings, contract inventory, topology, messages and version changes will appear here.

External $ref targets are never fetched. Generated examples and migration drafts are review aids; validate bindings and deployment behavior with the target broker and toolchain.

About AsyncAPI Contract Workbench

Validate event-driven API contracts, visualize topology and compare versions. Inspect AsyncAPI 2.x and 3.x documents locally, summarize servers, channels, operations and messages, visualize event flows, and draft a 3.1 migration. The core workflow is designed to run in your current browser.

Key capabilities

  • Use the official AsyncAPI parser when the document is self-contained
  • Understand common AsyncAPI 2.x and 3.x contract structures
  • Build a server-channel-operation topology and Mermaid diagram
  • Compare versions and draft a migration to AsyncAPI 3.1

Useful for

  • Review Kafka, MQTT, AMQP and WebSocket contracts before release
  • Share a visual event topology and message examples
  • Identify contract changes and prepare a 2.x to 3.1 migration draft

Frequently asked questions

Is AsyncAPI Contract Workbench free to use online?

Yes. AsyncAPI Contract Workbench opens in a modern browser and does not require desktop software installation.

What is AsyncAPI Contract Workbench useful for?

Common use cases include Review Kafka, MQTT, AMQP and WebSocket contracts before release; Share a visual event topology and message examples.

Is my input or file uploaded?

The core processing workflow is designed to run locally in the browser. Key capabilities include Use the official AsyncAPI parser when the document is self-contained, Understand common AsyncAPI 2.x and 3.x contract structures, Build a server-channel-operation topology and Mermaid diagram; account, comments, and anonymous analytics may still create normal site requests.

Comments

0 comments

Sign in to comment
AAccount

Sign in to comment and reply.

Sign in
No comments yet. Be the first to leave feedback.

ToolRen Online Toolkit © 2026