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: 2026-03-25 00:22:16 UTC
JSON Representation

https://github.com/jentic/jentic-openapi-tools

Jentic OpenAPI Tools

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https://github.com/loopbackio/loopback-connector-openapi

LoopBack connector for OpenAPI spec (2.0 and 3.0.x) compliant services

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https://github.com/mjovanc/rust-actix-example

RESTful API written in Rust + Actix etc.

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https://github.com/FusionAuth/fusionauth-openapi

FusionAuth OpenAPI client

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https://github.com/egomobile/swagger-ui-cli

A standalone CLI application, serving Swagger UIs via a HTTP server.

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https://github.com/mockloop/mockloop-mcp

Intelligent Model Context Protocol (MCP) server for AI-assisted API development. Generate mock servers from OpenAPI specs with advanced logging, performance analytics, and server discovery. Optimized for AI development workflows with comprehensive testing insights and automated analysis.

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https://github.com/namuan/fuzzy-swagger

API fuzz testing generator using swagger document.

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https://github.com/avanov/openapi-client-generator

Generates Python client packages from OpenAPI v3 specifications. The project aims at supporting any generic valid specification.

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https://github.com/apiaddicts/sonar-openapi

Evaluation engine for OpenAPI/Swagger API definitions in SonarQube

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https://github.com/shavo007/k6-demo

demo perf tests using k6 and OAS (open api spec)

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https://github.com/mrmoeinm/aspnetcore.rapidoc

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Monkey patches for unmaintained flask-restx

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https://github.com/fleny113/endpointmapper

Endpoint Mapper for ASP.NET Core 8

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https://github.com/ybelenko/oauth2_as_oas3_components

OAuth2 definitions as OpenAPI Spec 3.0 components

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https://github.com/vrerv/openapi-markdown

Convert openapi spec to markdown file

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https://github.com/rmkasendwa/swagger-to-ts

swagger-to-ts is a powerful library that allows you to generate TypeScript code from Swagger documentation or OpenAPI specifications. It simplifies the process of integrating API definitions into your TypeScript projects, saving you time and effort.

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https://github.com/trivedi-khushi/openapi-sample-library

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https://github.com/theirish81/mockambo

Dynamic API Mocking, recording and Validation

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https://github.com/valgene/valgene-cli

Multi language validation code and DTO generator from OpenAPI specification.

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https://github.com/hey-api/upload-openapi-spec

🚀 A GitHub Action for uploading OpenAPI specifications to Hey API. Support: @mrlubos

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https://github.com/kyma-incubator/documentation-component

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https://github.com/vereinfacht/vereinfacht

Web‑based club management platform, designed to digitize core organizational tasks for nonprofit and volunteer-based associations.

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https://github.com/nicolastakashi/todoapp-openapidocuments

Examples used in the post published on Medium.

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https://github.com/fusionauth/fusionauth-openapi

FusionAuth OpenAPI specification

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https://github.com/sap/openapi-specification

The SAP's extension to OpenAPI Specification defines a standard for describing HTTP APIs at SAP.

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https://github.com/stackql/stackql-registry-docs

StackQL provider documentation for cloud and SaaS providers available in the StackQL Provider Registry, built with Docusaurus.

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https://github.com/disruptek/gcplat

Google Cloud Platform (GCP) APIs in Nim

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https://github.com/beezup/dotnet-codegen

Code Generator as a dotnet global tool

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https://github.com/e2fyi/argo-models

Generated openapi models for argo

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https://github.com/stepci/plugin-openapi

Step CI OpenAPI support

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https://github.com/scottlogic/openapi-forge

⚒️🔥 Effortlessly create OpenAPI clients, in a range of languages, from the fiery furnace of our forge

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https://github.com/thecodedaniel/flutter_gpt

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https://github.com/cameronking4/notion-openapi-chatgpt-action

NotionGPT - Create a custom GPT action that calls the official & latest Notion API. Unlock the power of custom GPTs and access your Notion workspace in ChatGPT with natural language. Push and Pull Content from Your Notion with ChatGPT 🔥.

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https://github.com/vinitshahdeo/openapi-url-resolver

Resolve server URLs and extract hosts from OpenAPI 3.x and Swagger specifications.

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https://github.com/vihuvac/expressure

Expressure is a modern, opinionated boilerplate for building scalable NodeJS APIs with Express.js, TypeScript, OpenAPI, and Docker. Whether you're crafting a monolith or spinning up microservices, Expressure gives you a clean, consistent foundation with smart defaults and zero friction.

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https://github.com/sylhare/petshop

🐶🛒 Kotlin spring-boot project using a generated API from a swagger file

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https://github.com/zhudotexe/fastlmi

A fast framework (in both performance and development time) for creating language model interfaces - a more generic term for tools built for AIs like ChatGPT plugins.

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https://github.com/sgraaf/openapi-scraper

Track changes to RESTful APIs by git scraping their OpenAPI descriptions

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https://github.com/swaggerexpert/apidom-validate

This GitHub Action validates OpenAPI 2.0, OpenAPI 3.x.y and AsyncAPI 2.x definition file using ApiDOM Language Service.

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https://github.com/vonter/open-bmtc

Unoffical Namma BMTC API documentation

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https://github.com/helciodev/weather-app

A weather app that gets user location and fetches the current weather from the open weather API. The user can search up from more than 220 cities around the world, user can also choose which unit the temperature will be displayed by pressing the toggle button.

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https://github.com/webman-tech/swagger

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https://github.com/bonitasoft/bonita-openapi

This repository contains the Bonita OpenAPI specification

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https://github.com/leidenheit/itarazzo-library

Library to parse, validate and execute an Arazzo specification.

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https://github.com/el1s7/rests

Easily generate API client's SDK — organize and simplify API Requests — OOP-ish way.

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https://github.com/jobinsjp/api-generator

Generate api docs while writing test case (Laravel).

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https://github.com/laura-rodriguez/dotnetconf22

Minimal API + OpenAPI Sample

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https://github.com/akiosarkiz/openapi-laravel-attributes

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https://github.com/skbkontur/perl-jsonschema-validator

JSON Schema and OpenAPI data validator for Perl

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https://github.com/codeasashu/react-openapi-designer

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https://github.com/getsimpletool/mcpo-simple-server

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https://github.com/ryoppippi/openapi-with-hono-and-swift

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https://github.com/wubin1989/pullcode

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https://github.com/zerotier/zerotier-one-api-spec

ZeroTier

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https://github.com/ootkin/skimx

Create web applications using OpenAPI schemas

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https://github.com/magisteriis/riot-games-help-to-swagger-dotnet

Converts Riot Games' native help format to Swagger and OpenAPI.

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https://github.com/deepgram/deepgram-api-specs

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https://github.com/damienbod/webapiopenapi

.NET 9 Open API in ASP.NET Core

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https://github.com/d-yoshi/redmine-openapi

Unofficial OpenAPI specification for the Redmine API

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https://github.com/kherp/swagger-codegen-openapi

generate code from openapi/ swagger

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https://github.com/kentaroutakeda/laravel-openapi-validator

Request and response validators based on the OpenAPI Specification.

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https://github.com/postman-open-technologies/schema-org-openapi-catalog

Schema.Org OpenAPI Catalog (GSoC 2023)

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https://github.com/birddevelper/notebookmanager

A Real World Example for Open API Restful Spring boot Application + Swagger + MySQL + Docker

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https://github.com/fnt-eve/goesi-openapi

Go client library for EVE Online's ESI API with OAuth2 authentication, PKCE support, and automatic spec updates

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https://github.com/microcks/microcks-spectral-ruleset

A set of rules for Spectral that allows linting OpenAPI and AsyncAPI spec for Microcks conventions

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https://github.com/mikestead/yaml-fragment

Generate a yaml document from smaller yaml documents

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https://github.com/omermecitoglu/next-openapi-json-generator

a Next.js plugin to generate OpenAPI documentation from route handlers

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https://github.com/grktsh/falcon-oas

Design first approach with OpenAPI 3 for Falcon

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https://github.com/paulvollmer/openapi-split

openapi-split is a simple commandline tool to organize an openapi (swagger) specification across multiple files

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https://github.com/sanidhyy/3d-website

A 3D AI Powered T-Shirt Customizer using Three.js

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https://github.com/andostronaut/eslint-ai

eslint-ai is an cli tools that help us to lint and view suggestion from ai if we had a code error with eslint support.

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https://github.com/jaredwray/docula

Beautiful Website for Your Projects

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https://github.com/pe-st/apidocs

Examples and comparison of how a REST API can be documented with different technologies

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https://github.com/welcomattic/openapi-enricher

Enrich an OpenAPI spec with response examples to mock it efficiently

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https://github.com/keift/yuppi

Schemas that can be converted to Yup and JSON Schema.

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https://github.com/apideck-libraries/openapi-specs

The OpenAPI specifications for the Apideck APIs.

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https://github.com/marioruiz/create_tests

Create Tests automatically from a Requests file. Perfect to be used with the result from importing a Swagger file using the open_api_import gem. Now we are supporting RSpec.

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https://github.com/saltbo/openapi-rest-admin

Automatically generate admin interfaces from OpenAPI specifications

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https://github.com/ketiko/open_api-rspec

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https://github.com/xuzhg/odata.openapi

OData to Open API

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https://github.com/falcoframework/falco.openapi

OpenAPI integration for Falco.

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https://github.com/gocodebox/lifterlms-rest

LifterLMS REST API Feature Plugin

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https://github.com/kaizhu256/node-swgg

this zero-dependency package will run a virtual swagger-ui server with persistent-storage in the browser, that your webapp can use (in-place of a real backend), with a working web-demo

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https://github.com/oai/sig-travel

A repo for managing the travel working group within the OpenAPI Initiative (OAI)

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https://github.com/kodius/rails-api-rest

Rails 7 REST (openapi) template repo with Dockerfile, docker-compose and docker-swarm stack

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https://github.com/ltmenezes/fences

Fences is an LLM augmented OpenAPI interpreter with a visual interface to easily make requests

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https://github.com/iamrajiv/gsod-2021

This repository contains information about my work in the Google Season of Docs 2021. I participated with Wechaty, and my project was on Improve the gRPC and OpenAPI ecosystem of Wechaty.

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