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AsyncAPI

Open standard for defining event-driven async APIs

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About

The specification standard for async, event-driven APIs over Kafka, MQTT, WebSockets, and more — the async equivalent of OpenAPI. The ecosystem includes CLI, parser, code generators, and server stub templates. Widely adopted in microservices and streaming architectures.

Choose AsyncAPI when…

  • •You're documenting event-driven or async APIs
  • •Kafka, WebSocket, or MQTT interfaces need specs
  • •You want OpenAPI-style tooling for async messaging

Builder Slot

How do you define what you're building?Optional for most stacks

Spec writing, API design, architecture diagrams, and contract-first tooling — the upstream layer before code is written

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Other tools in this slot:

Spec KitMermaidEraserStructurizrSwagger / OpenAPIRedoclyStoplightSpeakeasy+3 more

Integrates with (1)

RedoclySpecifications

Redocly supports rendering AsyncAPI specs alongside OpenAPI specs, providing a unified documentation experience.

→ Unified API docs covering REST and event-driven APIs — both spec formats rendered and validated through one toolchain.

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Often paired with (1)

Swagger / OpenAPI

Pricing

✦ Free tier available

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