OpenAPI Specification

The OpenAPI Specification (OAS), previously known as the Swagger Specification, is a specification for a programming language-agnostic, machine-readable interface definition language for describing, producing, consuming, and visualizing web services. OpenAPI documents describe API services and are represented in YAML or JSON formats.

GitHub: https://github.com/topics/openapi
Wikipedia: https://en.wikipedia.org/wiki/OpenAPI_Specification
Repo: https://github.com/OAI/OpenAPI-Specification
Created by: OpenAPI Initiative, Tony Tam, Darrel Miller, Mike Ralphson, Ron Ratovsky, Uri Sarid, Jason Harmon
Released: August 10, 2011
Related Topics: json-schema, raml, rest-api,
Aliases: open-api, swagger-spec, swagger-specification, openapi-spec, openapi-specification, open-api-specification, oas, openapi-description,
Last updated: 2026-01-22 00:18:40 UTC
JSON Representation

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https://github.com/mkon/openapi_contracts

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https://github.com/microsoft/kiota-python

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https://github.com/sambacha/ethereum-api

Solidity API contract design information for utilizing RPC/RESTful Node Interaction and GraphQL

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Generate an OpenAPI specification from a Python class definition

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Automate design-first API workflows by generating schemas and types from OpenAPI specs.

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https://github.com/vymalo/keycloak-phone-number

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OpenAPI specification for the Outline API

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Library for generating a Mastercard API compliant OAuth signature.

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https://github.com/apiaddicts/openapi2postman

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OpenAPI descriptions for Pinterest's REST API

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https://github.com/marle3003/mokapi

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OpenAPI, AsyncAPI and JSON Schema Scala models.

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https://github.com/arcus-azure/arcus.webapi

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https://github.com/FuzzyMonkeyCo/monkey

@FuzzyMonkeyCo's minion

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Open API spec definition for the scanners that can be plugged into Harbor to do artifact scanning.

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Let's bring OpenAPI-driven routing, request and response validation to Laravel!

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Extension that generates a compliant OpenAPI spec and server implementation

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OpenAPI-based test coverage analysis tool that helps teams improve integration test coverage in CI/CD pipelines

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https://github.com/orsinium-labs/valdo

✅ Go package for validating JSON. It's the first Go package that can generate JSON Schema (OpeanAPI-compatible), produces user-friendly errors, and supports translations.

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https://github.com/hypnoglow/oas2

OpenAPI 2.0 (aka Swagger) utils for Golang.

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https://github.com/lusingander/topi

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https://github.com/rpstreef/aws-sam-node-example

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https://github.com/api-specification-toolbox/toolbox

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https://github.com/wapmorgan/openapigenerator

OpenApi configuration generator directly from PHP code (PhpDoc and php type hints). Can be used with a large monolithic backend

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https://github.com/darkredz/zeko-restapi-framework

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https://github.com/kevinswiber/spego

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https://github.com/heikkilamarko/todo-app

Todo App

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https://github.com/juliancataldo/astro-openapi

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https://github.com/speakeasy-api/openapi-overlay

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https://github.com/kberov/slovo

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https://github.com/microcks/microcks-testcontainers-java-spring-demo

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https://github.com/visulima/visulima

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