OpenAPI Specification API

The OpenAPI Specification (OAS) offers a standardized, machine-readable format (YAML/JSON) for describing RESTful HTTP APIs. It enables automation of documentation, code generation, testing, and client/server scaffolding, fostering collaboration across development, testing, and product teams. Highly supported and evolving through community contributions, it’s pivotal in API contract-first engineering.

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Aug 29, 2025

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API Endpoints

Retrieve the OpenAPI Specification document

Full URL

https://spec.openapis.org/oas/v3.1/oas/v3.1

Code Examples

curl -X GET 'https://spec.openapis.org/oas/v3.1/oas/v3.1'

Example Response

{
  "info": {
    "title": "OpenAPI Specification",
    "version": "3.1.0"
  },
  "openapi": "3.1.0"
}

Version

v3.1

Rate Limit

Unlimited
Tags
api-standardizationdocumentation-generationtool-interoperability
Technical Details
Authentication
None
Response Formats
JSON, YAML
Availability
global
Status
Published
Rate Limits

Unlimited

Supported Languages
All
Use Cases
API standardization
documentation generation
tool interoperability

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OpenAPI Specification API | Standard REST API Contracts | Free API Hub