AsyncAPI is a Linux Foundation project that improves the state of event-driven architectures by providing an open specification and tooling ecosystem for defining asynchronous and event-driven APIs. It enables developers to document, validate, generate code, and manage message-driven APIs across protocols including Kafka, MQTT, WebSocket, AMQP, and others. The AsyncAPI specification serves as the industry standard for describing asynchronous messaging interfaces, similar to how OpenAPI serves REST APIs.
AsyncAPI publishes 9 APIs on the APIs.io network, including Specification, Server API, Bundle API, and 6 more. Tagged areas include Event-Driven, Linux Foundation, Messaging, Standards, and Specification.
AsyncAPI’s developer surface includes developer portal, documentation, engineering blog, CLI, authentication, changelog, sandbox, and 26 more developer resources.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it
carries 10 points of the composite. It is scored from the published contracts
themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already
holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in
front of it, and the first time that check is skipped a duplicate record is created.
Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet,
not penalised by it.
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The AsyncAPI Specification is an open standard for describing asynchronous and event-driven APIs. It provides a machine-readable format for defining messaging interfaces across ...
The AsyncAPI Server API is the only callable HTTP API the AsyncAPI Initiative operates. It exposes the official AsyncAPI toolchain — validate, parse, convert, generate, bundle a...
An open specification standard for describing asynchronous and event-driven APIs, supporting multiple messaging protocols including Kafka, MQTT, WebSocket, AMQP, and more.
AsyncAPI Generator
Code and documentation generation tool that uses AsyncAPI definitions to produce boilerplate code, documentation, and other artifacts in multiple programming languages.
AsyncAPI CLI
Command-line interface tool for working with AsyncAPI files including validation, generation, and conversion operations from the terminal.
AsyncAPI Studio
Web-based editor and visualization tool for creating, editing, and previewing AsyncAPI specification documents with real-time validation.
Protocol Support
Broad protocol support covering Kafka, MQTT, WebSocket, AMQP, NATS, JMS, and other messaging protocols through a unified specification format.
Development teams use AsyncAPI to create machine-readable documentation for their message-driven APIs, making it easier for consumers to understand and integrate with event stre...
Code Generation for Messaging
Engineers generate boilerplate code for Kafka consumers, MQTT publishers, and other messaging clients directly from AsyncAPI specifications to accelerate development.
API Governance for Event-Driven Systems
Platform teams apply AsyncAPI specifications to enforce standards and governance across microservices architectures using event-driven communication.
aid: asyncapi
name: AsyncAPI
description: AsyncAPI is a Linux Foundation project that improves the state of event-driven architectures by providing an
open specification and tooling ecosystem for defining asynchronous and event-driven APIs. It enables developers to document,
validate, generate code, and manage message-driven APIs across protocols including Kafka, MQTT, WebSocket, AMQP, and others.
The AsyncAPI specification serves as the industry standard for describing asynchronous messaging interfaces, similar to
how OpenAPI serves REST APIs.
type: Index
deliveryModel:
model: open-source
open_source: true
commercial: false
callable_host: true
label: Open source (Apache-2.0) with a free hosted API
confidence: high
source:
- openapi
- packages
- plans
note: The specification and every first-party tool are Apache-2.0 under the Linux Foundation, and the AsyncAPI Server API
is callable at https://api.asyncapi.com/v1 — verified by an anonymous HTTP 200 on 2026-09-06. There is no commercial offering
of any kind.
generated: '2026-09-06'
method: probed
accessModel:
pricing: free
onboarding: none
trial: false
try_now: true
public: true
label: Free and keyless — no account required
confidence: high
source:
- plans
- authentication
note: No pricing page, no plans, no signup and no API key. An anonymous POST to https://api.asyncapi.com/v1/validate returned
HTTP 200 on 2026-09-06, and AsyncAPI Studio at https://studio.asyncapi.com is usable without an account.
generated: '2026-09-06'
method: probed
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/asyncapi.png
tags:
- Event-Driven
- Linux Foundation
- Messaging
- Standards
- Specification
url: https://raw.githubusercontent.com/api-evangelist/asyncapi/refs/heads/main/apis.yml
created: '2026-03-16'
modified: '2026-09-06'
specificationVersion: '0.23'
apis:
- aid: asyncapi:asyncapi-spec
name: AsyncAPI Specification
description: The AsyncAPI Specification is an open standard for describing asynchronous and event-driven APIs. It provides
a machine-readable format for defining messaging interfaces across protocols like Kafka, MQTT, WebSocket, and AMQP, enabling
documentation generation, code generation, and validation tooling for event-driven architectures.
humanURL: https://www.asyncapi.com/docs
tags:
- Event-Driven
- Messaging
- Specification
- Standards
properties:
- type: Documentation
url: https://www.asyncapi.com/docs
- type: GettingStarted
url: https://www.asyncapi.com/docs/tutorials/getting-started
- type: AsyncAPI
url: https://github.com/asyncapi/spec/blob/master/spec/asyncapi.md
- aid: asyncapi:asyncapi-server-api
name: AsyncAPI Server API
description: 'The AsyncAPI Server API is the only callable HTTP API the AsyncAPI Initiative operates. It exposes the official
AsyncAPI toolchain — validate, parse, convert, generate, bundle and diff — over HTTP at https://api.asyncapi.com/v1, free,
keyless and without signup. It is stateless: every operation takes an AsyncAPI (or OpenAPI 3.0) document in the request
body and returns a derived document, diagnostics or service metadata. The same service is self-hostable via Docker or
`asyncapi start api`.'
humanURL: https://api.asyncapi.com/v1/docs
baseURL: https://api.asyncapi.com/v1
tags:
- Event-Driven
- Specification
- Tooling
- Validation
- Code Generation
properties:
- type: OpenAPI
url: openapi/asyncapi-server-api-openapi.yml
- type: APIReference
url: https://api.asyncapi.com/v1/docs
- type: Overlay
url: overlays/asyncapi-server-api-overlay.yaml
- type: ErrorCatalog
url: errors/asyncapi-problem-types.yml
- type: DataModel
url: data-model/asyncapi-data-model.yml
- type: SourceCode
url: https://github.com/asyncapi/cli/tree/master/src/apps/api
- aid: asyncapi:asyncapi-bundle-api
name: AsyncAPI Bundle API
description: The Bundle API from AsyncAPI — 1 operation(s) for bundle.
humanURL: https://api.asyncapi.com/v1/docs
baseURL: https://api.asyncapi.com/v1
tags:
- Bundle
properties:
- type: OpenAPI
url: openapi/asyncapi-bundle-api-openapi.yml
- aid: asyncapi:asyncapi-convert-api
name: AsyncAPI Convert API
description: The Convert API from AsyncAPI — 1 operation(s) for convert.
humanURL: https://api.asyncapi.com/v1/docs
baseURL: https://api.asyncapi.com/v1
tags:
- Convert
properties:
- type: OpenAPI
url: openapi/asyncapi-convert-api-openapi.yml
- aid: asyncapi:asyncapi-diff-api
name: AsyncAPI Diff API
description: The Diff API from AsyncAPI — 1 operation(s) for diff.
humanURL: https://api.asyncapi.com/v1/docs
baseURL: https://api.asyncapi.com/v1
tags:
- Diff
properties:
- type: OpenAPI
url: openapi/asyncapi-diff-api-openapi.yml
- aid: asyncapi:asyncapi-generate-api
name: AsyncAPI Generate API
description: The Generate API from AsyncAPI — 1 operation(s) for generate.
humanURL: https://api.asyncapi.com/v1/docs
baseURL: https://api.asyncapi.com/v1
tags:
- Generate
properties:
- type: OpenAPI
url: openapi/asyncapi-generate-api-openapi.yml
- aid: asyncapi:asyncapi-help-api
name: AsyncAPI Help API
description: The Help API from AsyncAPI — 1 operation(s) for help.
humanURL: https://api.asyncapi.com/v1/docs
baseURL: https://api.asyncapi.com/v1
tags:
- Help
properties:
- type: OpenAPI
url: openapi/asyncapi-help-api-openapi.yml
- aid: asyncapi:asyncapi-parse-api
name: AsyncAPI Parse API
description: The Parse API from AsyncAPI — 1 operation(s) for parse.
humanURL: https://api.asyncapi.com/v1/docs
baseURL: https://api.asyncapi.com/v1
tags:
- Parse
properties:
- type: OpenAPI
url: openapi/asyncapi-parse-api-openapi.yml
- aid: asyncapi:asyncapi-validate-api
name: AsyncAPI Validate API
description: The Validate API from AsyncAPI — 1 operation(s) for validate.
humanURL: https://api.asyncapi.com/v1/docs
baseURL: https://api.asyncapi.com/v1
tags:
- Validate
properties:
- type: OpenAPI
url: openapi/asyncapi-validate-api-openapi.yml
common:
- type: Website
url: https://www.asyncapi.com/
- type: AgenticAccess
url: agentic-access/asyncapi-agentic-access.yml
- type: DomainSecurity
url: security/asyncapi-domain-security.yml
- type: LinkedIn
url: https://www.linkedin.com/company/asyncapi
- type: Portal
url: https://www.asyncapi.com/
title: AsyncAPI Website
- type: Documentation
url: https://www.asyncapi.com/docs
title: Documentation
- type: GitHubOrganization
url: https://github.com/asyncapi
title: AsyncAPI GitHub Organization
- type: Blog
url: https://www.asyncapi.com/blog
title: Blog
- type: Features
data:
- name: AsyncAPI Specification
description: An open specification standard for describing asynchronous and event-driven APIs, supporting multiple messaging
protocols including Kafka, MQTT, WebSocket, AMQP, and more.
- name: AsyncAPI Generator
description: Code and documentation generation tool that uses AsyncAPI definitions to produce boilerplate code, documentation,
and other artifacts in multiple programming languages.
- name: AsyncAPI CLI
description: Command-line interface tool for working with AsyncAPI files including validation, generation, and conversion
operations from the terminal.
- name: AsyncAPI Studio
description: Web-based editor and visualization tool for creating, editing, and previewing AsyncAPI specification documents
with real-time validation.
- name: Protocol Support
description: Broad protocol support covering Kafka, MQTT, WebSocket, AMQP, NATS, JMS, and other messaging protocols through
a unified specification format.
- type: UseCases
data:
- name: Event-Driven API Documentation
description: Development teams use AsyncAPI to create machine-readable documentation for their message-driven APIs, making
it easier for consumers to understand and integrate with event streams.
- name: Code Generation for Messaging
description: Engineers generate boilerplate code for Kafka consumers, MQTT publishers, and other messaging clients directly
from AsyncAPI specifications to accelerate development.
- name: API Governance for Event-Driven Systems
description: Platform teams apply AsyncAPI specifications to enforce standards and governance across microservices architectures
using event-driven communication.
- type: Integrations
data:
- name: Apache Kafka
description: AsyncAPI supports defining Kafka-based event-driven APIs with topic, message schema, and broker configuration
documentation.
- name: MQTT Brokers
description: IoT and messaging platforms using MQTT can document their pub/sub interfaces using AsyncAPI specifications
for device and service integration.
- name: CI/CD Pipelines
description: AsyncAPI CLI integrates into continuous integration pipelines for automated validation and linting of AsyncAPI
specification files.
- type: Packages
url: packages/asyncapi-packages.yml
title: First-party packages and SDKs
- type: SDKs
url: packages/asyncapi-packages.yml
title: AsyncAPI client libraries and tooling packages
- type: CLI
url: cli/asyncapi-cli.yml
title: AsyncAPI CLI command surface
- type: Components
url: components/asyncapi-components.yml
title: Embeddable AsyncAPI document renderers
- type: Authentication
url: authentication/asyncapi-authentication.yml
title: Authentication profile (keyless public API)
- type: Conventions
url: conventions/asyncapi-conventions.yml
title: API conventions and runtime semantics
- type: ErrorCatalog
url: errors/asyncapi-problem-types.yml
title: Problem-details error catalog
- type: Lifecycle
url: lifecycle/asyncapi-lifecycle.yml
title: Versioning and lifecycle
- type: ChangeLog
url: changelog/asyncapi-changelog.yml
title: Specification and CLI release history
- type: Conformance
url: conformance/asyncapi-conformance.yml
title: Standards conformance
- type: DataModel
url: data-model/asyncapi-data-model.yml
title: Server API data model
- type: Plans
url: plans/asyncapi-plans-pricing.yml
title: Plans and pricing (none — open source, no commercial tiers)
- type: RateLimits
url: rate-limits/asyncapi-rate-limits.yml
title: Rate limits (none published)
- type: Sandbox
url: sandbox/asyncapi-sandbox.yml
title: AsyncAPI Studio and self-hosted API
- type: Console
url: https://studio.asyncapi.com
title: AsyncAPI Studio
- type: Overlay
url: overlays/asyncapi-server-api-overlay.yaml
title: API Evangelist enhancements overlay
- type: LLMsTxt
url: llms/asyncapi-llms.txt
title: llms.txt
- type: AgentSkill
url: skills/_index.yml
title: Packaged agent skills for the AsyncAPI Server API
- type: VulnerabilityDisclosure
url: security/asyncapi-vulnerability-disclosure.yml
title: Coordinated vulnerability disclosure
- type: Security
url: https://github.com/asyncapi/.github/blob/master/SECURITY.md
title: AsyncAPI Security Policy
- type: APIReference
url: https://api.asyncapi.com/v1/docs
title: AsyncAPI Server API reference
- type: GettingStarted
url: https://www.asyncapi.com/docs/tutorials/getting-started
title: Getting Started
- type: Support
url: https://www.asyncapi.com/community
title: Community
- type: TermsOfService
url: https://lfprojects.org/policies/terms-of-use/
title: LF Projects Terms of Use
- type: PrivacyPolicy
url: https://lfprojects.org/policies/privacy-policy/
title: LF Projects Privacy Policy
maintainers:
- FN: Kin Lane
email: kin@apievangelist.com
x-enrichment:
date: '2026-09-06'
status: enriched
artifacts_added: 31
pass: local-v3
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