# OAI/OpenAPI-Specification

The OpenAPI Specification Repository

Repository: https://github.com/OAI/OpenAPI-Specification
Canonical: https://ross.abutalabs.com/products/openapi-specification
Homepage: https://openapis.org
Language: Markdown
License: Apache-2.0
License Family: permissive
Topics: openapi, openapi-specification, apis, rest, oas, webapi
Last push: 2026-08-26T23:44:42+00:00

## Health v2 (maintenance only)
Score: 81/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 48, longevity 100
- inputs: {"age_days": 4566, "days_push": 7, "days_rel": 348, "gap_med": 0, "n_releases_24m": 4}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 31183, forks 9165 (observed 2026-08-28T04:11:56.602947+00:00)

## What it is
The official repository for the OpenAPI Specification (OAS), a vendor-neutral, language-agnostic standard for describing HTTP/REST APIs in YAML or JSON. It hosts the Markdown sources of all published spec versions under the Linux Foundation's OpenAPI Initiative, alongside related specs like Arazzo and Overlays.

## Use cases
- describe a REST API in a machine-readable format
- generate client SDKs and server stubs from an API definition
- generate interactive API documentation
- validate and lint API description files
- automate API test cases from a spec
- learn how to write OpenAPI descriptions
- adopt a design-first API development workflow

## When to choose
- you need the authoritative source for OpenAPI spec versions and release notes
- you want a widely supported, vendor-neutral standard for describing HTTP APIs
- you want tooling interoperability for docs, codegen, and testing built on one description format

## When to avoid
- you need a tool or library that parses or validates OpenAPI files rather than the spec itself
- you need to describe non-HTTP APIs or styles outside REST that OAS does not cover
- you want a ready-made implementation rather than a specification document

## Facets
- artifact type: learning-resource
- maturity: active
- function: api-documentation, documentation, sdk, testing
- domain: apis, web-development, developer-tools, documentation
- platform: cross-platform
- tags: openapi, swagger, rest, api-description, specification, yaml, json, code-generation, design-first

## Member repositories
- OAI/OpenAPI-Specification (main) score 81

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:56.602947+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T16:52:19.084121+00:00, confidence not recorded.
  - readme: https://github.com/OAI/OpenAPI-Specification (fetched 2026-08-28T04:11:56.602947+00:00, sha 0f4a35c47bfa)
  - homepage: https://openapis.org (fetched 2026-08-29T07:49:37.219728+00:00, sha f7c86dec7765)
  - site_page: https://www.openapis.org/about (fetched 2026-08-29T07:49:37.222448+00:00, sha 8a852c2d6946)
  - site_page: https://www.openapis.org/about/technical-developer-community (fetched 2026-08-29T07:49:37.224120+00:00, sha 8dfa9e58a87c)
  - site_page: https://www.openapis.org/get-involved/about (fetched 2026-08-29T07:49:37.227962+00:00, sha 8c0f250b7d06)
  - site_page: https://learn.openapis.org (fetched 2026-08-29T07:49:37.226073+00:00, sha a411d595c0ad)
  - site_page: https://www.openapis.org/membershipjoin (fetched 2026-08-29T07:49:37.229722+00:00, sha 0e611d74261d)
  - site_page: https://www.openapis.org/faq (fetched 2026-08-29T07:49:37.231476+00:00, sha 72c6eb02405d)
- Data as of 2026-08-30T08:39:29.467469+00:00.