cloudevents/spec

★ 5,758PythonAudience · developerComplexity · 2/5Setup · easy

Mindmap

mindmap
  root((CloudEvents))
    What it does
      Standard event format
      Cross-system compatibility
      No custom translation code
    Transport bindings
      HTTP and WebSockets
      Kafka and AMQP
      MQTT and NATS
    Serialization formats
      JSON
      Avro and Protobuf
    Official SDKs
      Go and Java
      Python and JavaScript
      C# Ruby PHP Rust

mindmap root((CloudEvents)) What it does Standard event format Cross-system compatibility No custom translation code Transport bindings HTTP and WebSockets Kafka and AMQP MQTT and NATS Serialization formats JSON Avro and Protobuf Official SDKs Go and Java Python and JavaScript C# Ruby PHP Rust

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Things people build with this

USE CASE 1

Adopt a shared event format so a service on AWS can send events that a Kafka consumer on another cloud processes without custom parsing

USE CASE 2

Build middleware or tooling that handles events from any source following the CloudEvents spec without special-casing each provider

USE CASE 3

Replace custom event schemas across microservices with a standard format that always includes source, type, unique ID, and timestamp

USE CASE 4

Use the official Go, Java, Python, or JavaScript SDKs to produce and consume CloudEvents without reading raw spec documents

Tech stack

JSONHTTPKafkaAMQPProtobuf

Getting it running

Difficulty · easy Time to first run · 30min

No code to install, start with the Primer document, then pick an official SDK for your language.

In plain English

CloudEvents is a specification, not a piece of software. It defines a standard way to describe events so that different systems can send and receive them without each needing custom integration code. An event in this context is a signal that something happened: a file was uploaded, a payment was processed, a database record changed. The problem is that every platform describes these signals in its own format, so any team connecting two systems has to write translation logic. CloudEvents provides an agreed-upon format that any system can produce or consume. The specification covers what fields an event must carry (such as a unique ID, the source that produced the event, the type of event, and the time it occurred) and how those fields should be packaged when sent over different transport protocols. Separate documents in the repository define bindings for HTTP, Kafka, MQTT, AMQP, NATS, and WebSockets, as well as serialization formats including JSON, Avro, and Protobuf. A team using HTTP and JSON can write to the same spec as a team using Kafka and Avro, and any middleware or tooling built around CloudEvents can handle both. The project is hosted by the Cloud Native Computing Foundation, a well-regarded industry body that also oversees Kubernetes and other widely adopted infrastructure projects. CloudEvents graduated from that organization in January 2024, meaning it passed a maturity review and has broad real-world adoption. Major cloud providers and SaaS companies have backed the effort. Alongside the spec documents, the repository links to official SDKs in a range of languages including Go, Java, Python, JavaScript, C#, Ruby, PHP, PowerShell, and Rust. These SDKs handle the mechanics of building and parsing CloudEvents so developers do not need to work with the raw specification documents. If you are new to the project, the README recommends starting with the Primer document, which explains the goals and design thinking behind the spec before you read the technical details.

Copy-paste prompts

Prompt 1

Show me what a valid HTTP POST request with a CloudEvents JSON payload looks like for a file-upload event, including all required fields.

Prompt 2

I am building a Kafka consumer that handles CloudEvents from multiple producers. Show me the Kafka binding format and how to parse the required attributes.

Prompt 3

What fields are required in a CloudEvents message and which are optional? Give me a comparison table using the HTTP plus JSON format.

Prompt 4

Using the official CloudEvents Python SDK, show me how to create a CloudEvent for a database record change and publish it over HTTP.

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