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: 2026-07-08 00:22:40 UTC
JSON Representation

https://github.com/jimsten/ticketflow

High-concurrency booking/ticketing system (MVP first)

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https://github.com/bradpatras/openapi-swift-package-schema-only

Testing out a swift package containing only the OpenAPI schema and generator plugin that can be consumed by an iOS app via spm.

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https://github.com/fluvpay/openapi

Especificação OpenAPI pública (v1) do gateway de pagamentos PIX da FluvPay. Cobranças, saques, transferências e webhooks.

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https://github.com/soenneker/soenneker.stoplight.openapibundler

A utility library to download and bundle OpenApi specs from Stoplight

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https://github.com/alexandramartinez/todo-app-mule-curietechai

Everything discussed in the 'From Zero to API with MuleSoft, CurieTech AI & Anypoint Code Builder' playlist.

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https://github.com/fibercrypto/skycoinr

Skycoin client libraries for the R programming language

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https://github.com/leanhanc/hono-betterauth-openapi-starter

A Hono 🔥 starter project using Drizzle ORM and Stoker helpers, featuring Better Auth integration and API documentation powered by OpenAPI.

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https://github.com/danhpaiva/pbh.smfa.viagensservidor.api.net

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https://github.com/oamerge/oamerge

Merge and share OpenAPI endpoints and schemas.

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https://github.com/mreiche/marketstack-openapi

Generated OpenAPI for Marketstack

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https://github.com/mahmudindev/oreno-comicking-openapi-python

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https://github.com/alessandro1918/swagger-api

Um exemplo de documentação de rotas de API com Swagger. Especificação de endpoints, parâmetros, retorno, tudo facilmente documentável e consultável em uma página web disponível em uma rota da própria API.

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https://github.com/thanadolps/swarch_rest

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https://github.com/kwaytv/hono-steamer-api

⚡ High-performance Steam profile resolver API with MySQL-powered smart caching system | Built with Hono & TypeScript 🚀

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https://github.com/soldarlabs/oapi-litegraph-nodegen

Generate dynamic and callable Litegraph nodes from OpenAPI specifications, enabling seamless API integration in a visual programming environment.

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https://github.com/webitel/webitel-openapi-client-go

Webitel OpenAPI Client for Go

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https://github.com/lifeiscontent/openapi-sdk

Generate Typesafe SDK from OpenAPI spec

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https://github.com/merkys/openapi-3to2

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https://github.com/zunda-pixel/niabis-api

NiaBis API

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https://github.com/block65/openapi-codegen

Opinionated OpenAPI Typescript code generator

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https://github.com/the-orange-alliance/toa-docs

📄Swagger Docs site hosting The Orange Alliance's OpenAPI Spec

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https://github.com/ahilke/openapi-microservice-playground

A demo project to showcase and experiment with various OpenAPI technologies in a microservice environment.

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https://github.com/soenneker/soenneker.openrouter.httpclients

A thread-safe singleton HttpClient for OpenRouter's OpenAPI integration.

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https://github.com/soenneker/soenneker.fastly.httpclients

A thread-safe singleton HttpClient for Fastly's OpenAPI integration.

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https://github.com/soenneker/soenneker.unified.httpclients

A thread-safe singleton HttpClient for Unified's OpenAPI integration.

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https://github.com/soenneker/soenneker.paypal.openapiclientutil

A thread-safe utility for obtaining PayPal's OpenApiClient singleton.

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https://github.com/duquejo/quarkus-tokencache-microservice

Resilient-ready external token cacheable service Proof of concept

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https://github.com/srinitude/effect-json-schema

Tiny Effect Schema adapter for Standard JSON Schema V1

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https://github.com/speakeasy-sdks/template-speakeasy-bar

A template for the Speakeasy Bar starter SDK.

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https://github.com/hyesungoh/cultural_heritage_administration_api

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https://github.com/aydanrahimova/linkedinclone

This LinkedIn clone replicates key features of the professional networking platform, allowing users to manage profiles, create posts, comment, react, connect with others, follow organizations, and explore job opportunities. Advanced features include creating organizations and applying for jobs.

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https://github.com/esn8der/tour-of-heroes-api

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https://github.com/robsonlmds/java-screenmatch

Este projeto é uma aplicação Java que utiliza uma API para buscar informações sobre séries de TV e seus episódios, permitindo que os dados sejam armazenados e listados através de um repositório.

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https://github.com/libninjacom/postman-go

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https://github.com/k5ki/oapigen-poc

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https://github.com/soenneker/soenneker.openhands.httpclients

A thread-safe singleton HttpClient for OpenHands's OpenAPI integration.

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https://github.com/drewalth/openapi-generator

Generate an OpenAPI Spec file from ORM model definitions

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https://github.com/swimmwatch/openapi-compare-version

A GitHub Action for comparing OpenAPI specifications version.

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https://github.com/rickyli79/egg-openapi-router

init `router` and connect `controller` by Openapi-doc. validate the request and response by Openapi-doc

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https://github.com/zaydiscold/goodreads-cli

Unofficial CLI + MCP for the full Goodreads API — shelves, ratings, reviews, friends, feed, giveaways (read + write). The API map is the product.

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https://github.com/scrntprcrz/openapi-sankeylizer

Visualize your OpenAPI specs as Sankey diagrams. Upload, explore request/response flows, and export as PNG.

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https://github.com/takeruun/fastify-sample

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https://github.com/serafin-labs/open-api

Open Api 3 typescript types definition

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https://github.com/ferror/openapi-coverage

Symfony Command that calculates Open API documentation coverage

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https://github.com/owlebot/open-api

Public API to interact with the owle.bot app

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https://github.com/luismendes070/desafio-parcelas

https://github.com/luismendes070/desafio-parcelas/blob/main/credit-application-system/src/test/kotlin/me/dio/credit/application/system/service/CustomerServiceTest.kt

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https://github.com/leozqin/laridae

A registry and proxy server for agentic tool-calling

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https://github.com/toobeeh/tirith

Angular & NEST fullstack application for skribbltypo website & dashboard

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https://github.com/soenneker/soenneker.intercom.openapiclient

A .NET client generated from the Intercom OpenAPI schema, updated daily

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https://github.com/rashidintheworld/file-document-restapi

This project contains a collection of services that perform step-by-step PDF creation. It allows users to convert any text in PDF format by setting font, color and RGB properties through a single API. I shared the project on GitHub and am open to development.

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https://github.com/layoric/exampleopenaiplugin

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https://github.com/soenneker/soenneker.openaq.openapiclientutil

A thread-safe utility for obtaining OpenAq's OpenApiClient singleton.

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https://github.com/romanow/aggregator-by-tags

OpenAPI aggregator by Tags

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https://github.com/debitoor/express-openapi

Express Open API

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https://github.com/bolshchikov/quiver-mcp

MCP server for Quiver API

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https://github.com/not-three/api

The !3 api, written in typescript, with the NestJS framework.

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https://github.com/humbertodias/mn-kotlin-openapi-helloworld

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https://github.com/gridaco/postgrest-openapi

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https://github.com/todofixme/openapi-showcases

How different OpenAPI generators might help to build stable REST APIs.

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https://github.com/andrecaiado/spring-boot-openapi

Spring Boot demo project that implements API documentation using OpenApi specification and API-first approach

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https://github.com/pixxiti/oax

Open API Spec validation and client generation tooling for Typescript

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https://github.com/go-api-libs/jobicy

Go library for the Remote Jobs API/RSS Feed. Discover and integrate a diverse range of remote job listings with Jobicy's public API. This API offers the latest remote job opportunities across various industries and regions, making it a valuable resource for developers and businesses looking to enhance their job feed platforms.

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https://github.com/skuong/rclone-rc-api-docs

Easy-to-read Rclone RC API docs using Scalar

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https://github.com/soenneker/soenneker.coinbase.openapiclients.cdp

A Coinbase .NET client generated from their OpenAPI schema, updated daily

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https://github.com/tpdlshdmlrkfmcla/sparta_coding

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https://github.com/ramanks19/the-complete-spring-boot-development-bootcamp

Contains workbook and practice exercise of the Udemy course - The Complete Spring Boot Development Bootcamp (by Learn The Part Inc.)

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https://github.com/mermade/api-registry

Own-label API registry which powers APIs.guru

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https://github.com/toliyansky/openapi-spring-generator-example

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https://github.com/thalida/openapi-docs-viewer

Display interactive OpenAPI schema documentation in VSCode

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https://github.com/soenneker/soenneker.cohere.openapiclient

A .NET client generated from the Cohere AI OpenAPI schema, updated daily

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https://github.com/axel7083/electron-vite-react-openapi-generator

electron template using openapi-generator for IPCs communication

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https://github.com/soenneker/soenneker.productboard.openapiclientutil

A thread-safe utility for obtaining ProductBoard's OpenApiClient singleton.

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https://github.com/soenneker/soenneker.nws.openapiclientutil

A thread-safe utility for obtaining Nws's OpenApiClient singleton.

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https://github.com/soenneker/soenneker.pipedrive.openapiclientutil

A thread-safe utility for obtaining Pipedrive's OpenApiClient singleton.

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https://github.com/k-kinzal/oas-fake-php

Intercept HTTP requests, validate against OpenAPI schemas, and generate fake responses for testing

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Last synced: 04 Apr 2026

https://github.com/adilrasheed139/lumilens-ai

LumiLens is an AI-powered platform designed to revolutionize virtual tourism by delivering immersive, interactive experiences that blend text, image, and video storytelling. With LumiLens, users can explore cultural sites, meet historical figures, and relive key events through AI-generated.

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https://github.com/soenneker/soenneker.twilio.httpclients

A thread-safe singleton HttpClient for Twilio's OpenAPI integration.

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https://github.com/zoobz-io/rocco

Type-safe HTTP framework for Go with automatic OpenAPI generation

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https://github.com/mowatermelon/mw2-antd

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https://github.com/soenneker/soenneker.persona.openapiclient

A .NET client generated from the Persona OpenAPI schema, updated daily

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https://github.com/mathrix-education/openapi-processor

Template Engine for YAML-based OpenAPI specifications.

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https://github.com/yoshinariyamanaka/openapi-with-express

OpenAPI-with-Express implemented in TypeScript

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https://github.com/kopfrechner/scalar-chrome-extension

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https://github.com/mikestead/openapi-operations

Convert an OpenAPI spec into an array of operations

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https://github.com/mustafaautomation/ai-testgen

AI-powered test case generator — transform PRDs, OpenAPI specs, and user stories into Playwright tests, API tests, and Gherkin features

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https://github.com/shopiqo/docker-yaml-include

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https://github.com/soenneker/soenneker.mistral.openapiclientutil

A thread-safe utility for obtaining Mistral's OpenApiClient singleton.

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https://github.com/rudeboyone/tarefastest

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https://github.com/boywithkeyboard-archive/openapi-vultr

An OpenAPI client for Vultr's API written in TypeScript.

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https://github.com/eukolos/product-service

Basic API for using microservices' cases

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https://github.com/soenneker/soenneker.github.filestore

A high-level file system utility for GitHub repositories, built on the GitHub OpenAPI client. Supports reading, writing, deleting, listing, and checking file existence via the GitHub Contents API.

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