# OpenAPI Specification

**Canonical:** https://apis.io/apis/restful/openapi-specification/  
**Provider:** RESTful — https://apis.io/providers/restful/  
**Documentation:** https://spec.openapis.org/oas/latest.html

OpenAPI Specification is one of 5 APIs that [RESTful](https://apis.io/providers/restful/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Documentation, Standards, and Tooling.

The OpenAPI Specification (OAS) defines a standard, language-agnostic interface for HTTP APIs. OpenAPI 3.x is the most widely-used format for describing RESTful APIs, enabling documentation, code generation, and validation.

## Machine-readable artifacts (2)

- **Specification** — https://spec.openapis.org/oas/latest.html
- **Website** — https://www.openapis.org/

## Other RESTful APIs (4)

- [Richardson Maturity Model](https://apis.io/apis/restful/richardson-maturity-model/)
- [JSON:API](https://apis.io/apis/restful/json-api/)
- [HAL - Hypertext Application Language](https://apis.io/apis/restful/hal-specification/)
- [RFC 9110 - HTTP Semantics](https://apis.io/apis/restful/http-rfc-9110/)

## Tags

Documentation, Standards, Tooling

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/restful/openapi-specification/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/restful/.