The AsyncAPI specification allows you to create machine-readable definitions of your asynchronous APIs.
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Updated
Jan 31, 2026 - JavaScript
The AsyncAPI Specification (AAS), is a specification for a programming language-agnostic, machine-readable interface definition language for describing, producing, consuming, and visualizing event-driven services.
AsyncAPI documents describe API services and are represented in YAML or JSON formats.
The AsyncAPI specification allows you to create machine-readable definitions of your asynchronous APIs.
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Created by AsyncAPI Initiative, Fran Méndez
Released September 20, 2017
Latest release 13 days ago