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CloudEvents Specification

Project README


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Events are everywhere. However, event producers tend to describe events differently.

The lack of a common way of describing events means developers must constantly re-learn how to consume events. This also limits the potential for libraries, tooling and infrastructure to aide the delivery of event data across environments, like SDKs, event routers or tracing systems. The portability and productivity we can achieve from event data is hindered overall.

CloudEvents is a specification for describing event data in common formats to provide interoperability across services, platforms and systems.

CloudEvents has received a large amount of industry interest, ranging from major cloud providers to popular SaaS companies. CloudEvents is hosted by the Cloud Native Computing Foundation (CNCF) and was approved as a Cloud Native sandbox level project on May 15, 2018 and as an incubator project on Oct 24, 2019.

CloudEvents Documents

Latest Release Working Draft
Core Specification:
CloudEvents v1.0.2 WIP
Optional Specifications:
AMQP Protocol Binding v1.0.2 WIP
AVRO Event Format v1.0.2 WIP
HTTP Protocol Binding v1.0.2 WIP
JSON Event Format v1.0.2 WIP
Kafka Protocol Binding v1.0.2 WIP
MQTT Protocol Binding v1.0.2 WIP
NATS Protocol Binding v1.0.2 WIP
WebSockets Protocol Binding - WIP
Protobuf Event Format v1.0.2 WIP
XML Event Format - WIP
Web hook v1.0.2 WIP
Additional Documentation:
CloudEvents Primer v1.0.2 WIP
CloudEvents Adapters - Not versioned
CloudEvents SDK Requirements - Not versioned
Documented Extensions - Not versioned
Proprietary Specifications - Not versioned

Other Specifications

Latest Release Working Draft
Discovery - WIP
Pagination - WIP
Schema Registry - WIP
Subscriptions - WIP

Additional release related information: Historical releases and changelogs

If you are new to CloudEvents, it is recommended that you start by reading the Primer for an overview of the specification's goals and design decisions, and then move on to the core specification.

Since not all event producers generate CloudEvents by default, there is documentation describing the recommended process for adapting some popular events into CloudEvents, see CloudEvents Adapters.


In addition to the documentation mentioned above, there is also an SDK proposal. A set of SDKs is also being developed:

Community and Docs

Learn more about the people and organizations who are creating a dynamic cloud native ecosystem by making our systems interoperable with CloudEvents.

Security Concerns

If there is a security concern with one of the specifications in this repository please open an issue.

A security assessment was performed by Trail of Bits in October 2022. The report can be found here.


The main mailing list for e-mail communications:

And a #cloudevents Slack channel under CNCF's Slack workspace.

For SDK related comments and questions:

Meeting Time

See the CNCF public events calendar. This specification is being developed by the CNCF Serverless Working Group. This working group meets every Thursday at 9AM PT (USA Pacific) (World Time Zone Converter):

Please see the meeting minutes doc for the latest information on how to join the calls.

Recording from our calls are available here, and older ones are here.

Periodically, the group may have in-person meetings that coincide with a major conference. Please see the meeting minutes doc for any future plans.

Open Source Agenda is not affiliated with "CloudEvents" Project. README Source: cloudevents/spec
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