CloudEvents

aid: cloudevents
name: CloudEvents
description: >-
  CloudEvents is a CNCF graduated specification for describing event data in a common way. It provides a consistent
  format for event metadata across services, platforms, and systems, enabling interoperability between event producers
  and consumers. The specification includes protocol bindings for HTTP, AMQP, Kafka, MQTT, and NATS, along with SDKs in
  multiple languages.
url: https://cloudevents.io
image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
tags:
  - Cloud Native
  - Events
  - Graduated
  - Interoperability
  - Messaging
  - Specification
created: '2026-03-16'
modified: '2026-05-19'
kind: standard
x-governance: CNCF (Cloud Native Computing Foundation)
x-status: Graduated
x-spec-version: 1.0.2
specificationVersion: '0.19'
type: Index
apis:
  - aid: cloudevents:cloudevents-spec
    name: CloudEvents Specification
    description: >-
      The CloudEvents specification defines a set of metadata attributes that must be present in every event, including
      source, type, id, and specversion. It provides a vendor-neutral way to describe events that enables consistent
      routing, filtering, and processing across different systems and cloud providers.
    humanURL: https://cloudevents.io/
    image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    properties:
      - type: Documentation
        url: https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/spec.md
      - type: Reference
        url: https://github.com/cloudevents/spec/blob/main/cloudevents/spec.md
      - type: GitHubRepository
        url: https://github.com/cloudevents/spec
      - type: ChangeLog
        url: https://github.com/cloudevents/spec/releases
      - type: JSONSchema
        url: json-schema/cloudevents-event-schema.json
      - type: AsyncAPI
        url: asyncapi/cloudevents-http-asyncapi.yml
    tags:
      - Events
      - Specification
      - Standards
  - aid: cloudevents:cloudevents-http-binding
    name: CloudEvents HTTP Protocol Binding
    description: >-
      The HTTP protocol binding defines how CloudEvents are transported using HTTP, including structured content mode
      where the entire event is in the HTTP body, and binary content mode where event attributes are mapped to HTTP
      headers. This enables REST APIs to produce and consume standardized events.
    humanURL: https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/bindings/http-protocol-binding.md
    image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    properties:
      - type: Documentation
        url: https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/bindings/http-protocol-binding.md
      - type: Reference
        url: https://github.com/cloudevents/spec/blob/main/cloudevents/bindings/http-protocol-binding.md
    tags:
      - HTTP
      - Protocol Binding
      - REST
  - aid: cloudevents:cloudevents-kafka-binding
    name: CloudEvents Kafka Protocol Binding
    description: >-
      The Kafka protocol binding for CloudEvents defines how events are mapped to Apache Kafka messages. It specifies
      how CloudEvents attributes are encoded as Kafka message headers and how the event payload is placed in the Kafka
      message value, enabling standardized event interchange over Kafka topics.
    humanURL: https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/bindings/kafka-protocol-binding.md
    image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    properties:
      - type: Documentation
        url: https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/bindings/kafka-protocol-binding.md
      - type: Reference
        url: https://github.com/cloudevents/spec/blob/main/cloudevents/bindings/kafka-protocol-binding.md
    tags:
      - Kafka
      - Messaging
      - Protocol Binding
  - aid: cloudevents:cloudevents-amqp-binding
    name: CloudEvents AMQP Protocol Binding
    description: >-
      The AMQP protocol binding for CloudEvents defines how events are mapped to OASIS AMQP 1.0 messages. In structured
      content mode, event attributes and data are placed in the AMQP message application data section; in binary content
      mode, event data is placed as-is with attributes mapped to AMQP message properties.
    humanURL: https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/bindings/amqp-protocol-binding.md
    image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    properties:
      - type: Documentation
        url: https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/bindings/amqp-protocol-binding.md
      - type: Reference
        url: https://github.com/cloudevents/spec/blob/main/cloudevents/bindings/amqp-protocol-binding.md
    tags:
      - AMQP
      - Messaging
      - Protocol Binding
  - aid: cloudevents:cloudevents-mqtt-binding
    name: CloudEvents MQTT Protocol Binding
    description: >-
      The MQTT protocol binding for CloudEvents defines how events are mapped to MQTT 3.1.1 and MQTT 5.0 messages. It
      supports both structured and binary content modes for IoT and constrained device environments that use MQTT as
      their messaging protocol.
    humanURL: https://github.com/cloudevents/spec/blob/main/cloudevents/bindings/mqtt-protocol-binding.md
    image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    properties:
      - type: Documentation
        url: https://github.com/cloudevents/spec/blob/main/cloudevents/bindings/mqtt-protocol-binding.md
    tags:
      - IoT
      - MQTT
      - Protocol Binding
  - aid: cloudevents:cloudevents-nats-binding
    name: CloudEvents NATS Protocol Binding
    description: >-
      The NATS protocol binding for CloudEvents defines how events are mapped to NATS messages. It enables CloudEvents
      to be produced and consumed over the NATS messaging system, supporting both publish/subscribe and request/reply
      patterns.
    humanURL: https://github.com/cloudevents/spec/blob/main/cloudevents/bindings/nats-protocol-binding.md
    image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    properties:
      - type: Documentation
        url: https://github.com/cloudevents/spec/blob/main/cloudevents/bindings/nats-protocol-binding.md
    tags:
      - Messaging
      - NATS
      - Protocol Binding
  - aid: cloudevents:cloudevents-subscriptions
    name: CloudEvents Subscriptions API
    description: >-
      The CloudEvents Subscriptions API specification defines a standard REST API for managing subscriptions to event
      streams. It enables clients to create, list, update, and delete subscriptions with filter criteria, providing a
      vendor-neutral way to manage event delivery configurations across different event brokers and message systems.
    humanURL: https://github.com/cloudevents/spec/blob/main/subscriptions/spec.md
    image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    properties:
      - type: Documentation
        url: https://github.com/cloudevents/spec/blob/main/subscriptions/spec.md
      - type: OpenAPI
        url: openapi/cloudevents-subscriptions-openapi.yml
    tags:
      - REST
      - Specification
      - Subscriptions
  - aid: cloudevents:cloudevents-cesql
    name: CloudEvents SQL (CESQL)
    description: >-
      CloudEvents SQL (CESQL) is a v1.0 specification that defines a standardized query language for filtering and
      routing CloudEvents based on their attributes. It provides a SQL-like syntax for writing event filter expressions
      that can be used across different event processing platforms and systems.
    humanURL: https://github.com/cloudevents/spec/blob/main/cesql/spec.md
    image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    properties:
      - type: Documentation
        url: https://github.com/cloudevents/spec/blob/main/cesql/spec.md
    tags:
      - Filtering
      - Specification
      - SQL
  - aid: cloudevents:cloudevents-sdk-go
    name: CloudEvents Go SDK
    description: >-
      The official Go SDK for CloudEvents provides libraries for producing and consuming CloudEvents in Go applications.
      It supports all CloudEvents protocol bindings and content modes, and includes client implementations for HTTP,
      Kafka, and other transports.
    humanURL: https://github.com/cloudevents/sdk-go
    image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    properties:
      - type: Documentation
        url: https://cloudevents.github.io/sdk-go/
      - type: GitHubRepository
        url: https://github.com/cloudevents/sdk-go
    tags:
      - Client Library
      - Go
      - SDK
  - aid: cloudevents:cloudevents-sdk-javascript
    name: CloudEvents JavaScript SDK
    description: >-
      The official JavaScript SDK for CloudEvents provides libraries for producing and consuming CloudEvents in Node.js
      and browser environments. It supports structured and binary content modes over HTTP and other transports.
    humanURL: https://github.com/cloudevents/sdk-javascript
    image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    properties:
      - type: Documentation
        url: https://github.com/cloudevents/sdk-javascript/blob/main/README.md
      - type: GitHubRepository
        url: https://github.com/cloudevents/sdk-javascript
    tags:
      - Client Library
      - JavaScript
      - SDK
  - aid: cloudevents:cloudevents-sdk-java
    name: CloudEvents Java SDK
    description: >-
      The official Java SDK for CloudEvents provides libraries for producing and consuming CloudEvents in Java
      applications. It includes support for HTTP, Kafka, and other transports, and integrates with popular Java
      frameworks.
    humanURL: https://github.com/cloudevents/sdk-java
    image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    properties:
      - type: Documentation
        url: https://github.com/cloudevents/sdk-java/blob/main/README.md
      - type: GitHubRepository
        url: https://github.com/cloudevents/sdk-java
    tags:
      - Client Library
      - Java
      - SDK
  - aid: cloudevents:cloudevents-sdk-python
    name: CloudEvents Python SDK
    description: >-
      The official Python SDK for CloudEvents provides libraries for producing and consuming CloudEvents in Python
      applications. It supports HTTP transport bindings and both structured and binary content modes.
    humanURL: https://github.com/cloudevents/sdk-python
    image: https://kinlane-productions2.s3.amazonaws.com/apis-json/apis-json-logo.jpg
    properties:
      - type: Documentation
        url: https://github.com/cloudevents/sdk-python/blob/main/README.md
      - type: GitHubRepository
        url: https://github.com/cloudevents/sdk-python
    tags:
      - Client Library
      - Python
      - SDK
common:
  - type: Website
    url: https://cloudevents.io
  - type: Documentation
    url: https://github.com/cloudevents/spec
  - type: GettingStarted
    url: https://github.com/cloudevents/spec/blob/main/cloudevents/primer.md
  - type: Blog
    url: https://cloudevents.io/blog/
  - type: GitHubOrganization
    url: https://github.com/cloudevents
  - type: SDKs
    url: https://github.com/cloudevents/spec/blob/main/cloudevents/SDK.md
  - type: ChangeLog
    url: https://github.com/cloudevents/spec/releases
  - type: JSONSchema
    url: json-schema/cloudevents-event-schema.json
  - type: OpenAPI
    url: openapi/cloudevents-subscriptions-openapi.yml
  - type: AsyncAPI
    url: asyncapi/cloudevents-http-asyncapi.yml
  - type: JSONLD
    url: json-ld/cloudevents-context.jsonld
  - type: Spectral
    url: rules/cloudevents-rules.yml
maintainers:
  - FN: Kin Lane
    email: [email protected]