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: 2026-07-05 00:18:41 UTC
JSON Representation

https://github.com/chandrikadeb7/go-couchbase-microservice

Go Microservice developed using Go Echo API Server OpenAPI with Couchbase backend

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https://github.com/bububa/kwai-openapi

快手openapi golang sdk

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https://github.com/bleemeo/bleemeo-go

Bleemeo Go SDK

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https://github.com/greeeg/openapi-kit

A set of utilities to generate an API client, types, mocks & react-query hooks for OpenAPI

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https://github.com/find-a-musician/findamusicianbackend

A website for my school where the musicians can contact each others, create groups and register to play at events

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https://github.com/insertish/oapi

Generate typed API libraries from OpenAPI specifications.

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https://github.com/kemingy/defspec

Create the OpenAPI spec and document from dataclass, attrs, etc.

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https://github.com/s2-streamstore/s2-protos

gRPC and OpenAPI spec for S2, the Stream Store

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https://github.com/ldej/swagger-go-example

An example setup for generating swagger docs using go-swagger and swaggo. Read the blog post for details!

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https://github.com/webpro/parse-openapi

OpenAPI v3 parser

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https://github.com/wolfeidau/realworld-aws-api

This project illustrates how to build an API in AWS using Go.

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https://github.com/ecube-labs/koa-x-router

`koa-x-router` is a library that extends the functionality of `@koa/router` by providing validation and automatic API documentation features. It simplifies the process of defining routes, validating request data, and generating API documentation.

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

Generate OpenAPI service stubs with complete validation layer using this openVALIDATION adapter.

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Generate strongly typed Gleam server stubs and client SDK from OpenAPI 3.x specifications

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https://github.com/cyyynthia/vitepress-scalar

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https://github.com/jiyuujin/vite-react-liff

LINE Front-end Framework × React

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

Unofficial CLI + MCP for the FULL Robinhood API (not just crypto) — multi-account equity + options (chains/Greeks/spreads/rolling), bulk contract UUID enumeration + contract deep-links, sentiment (news/ratings/crowd), recurring/transfers/dividends. Read + write, dry-run gated. Made in the name of equity.

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https://github.com/rdcm/web-api

Web api application prototype written in rust and actix-web.

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https://github.com/mockzilla/connexions

Generate APIs with meaningful responses, configurable latency, error codes and much more.

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https://github.com/openapi-kr/specifications

OAS collections for Korea Open API Services

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https://github.com/electrocucaracha/mcp-openapi-proxy

MCP Generator using OpenAPI spec

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https://github.com/badsyntax/mailinabox-api-py

Python client SDK for the Mail-in-a-Box API.

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https://github.com/darguelles/go-clean-architecture

Project template using clean architecture principles and OpenAPI to generate server/client code.

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https://github.com/spailybot/moleculer-auto-openapi

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https://github.com/goodforgod/micronaut-management-openapi

⚙️ Micronaut cloud-friendly OpenAPI/Swagger-UI/Rapidoc management.

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https://github.com/eloistree/openmacroinput

When keyboard is not enough !!!

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https://github.com/wetix/openapi-doc

WeTix Open API documentation

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https://github.com/belidzs/gitea

Automatically generated API client for Gitea with some minor fixes

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https://github.com/api-evangelist-tools/api-integration

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https://github.com/de4oult/autumn

Modern Python ASGI web framework

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https://github.com/anaptecs/jeaf-generator

JEAF Generator uses UML models to generate code for Spring, REST, OpenAPI, Java and others. Boost your software development efficiency and time-to-market. Bye bye handwritten boiler blade code.

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https://github.com/borud/nethsm

NetHSM Client library

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https://github.com/falcoframework/Falco.OpenApi

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https://github.com/airlock/microgateway-running-example

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https://github.com/gorillab/reader-api

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https://github.com/frenck/probatio

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https://github.com/onesignal/api

API Reference. OpenAPI Specification files for OneSignal's REST API.

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Generate front-end interface code that interacts with OpenAPI-based backend services

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https://github.com/CynthiaPeter/CynthiaPeter

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https://github.com/corpora-inc/corpora

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https://github.com/skmtc/skmtc

Skmtc is a declarative code generation framework

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https://github.com/sunrise-php/http-router-openapi

⚠️ OpenAPI (Swagger) support is now integrated in the router from version 3.

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https://github.com/cynthiapeter/cynthiapeter

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https://github.com/fa0311/twitter-openapi-docs

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https://github.com/sap/swagger-plugin-for-sphinx

A sphinx plugin which renders a OpenAPI specification with Swagger.

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https://github.com/useapi/midjourney-api-client

Python client library for Midjourney API by useapi.net

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https://github.com/marcelo-earth/webrewind

🤖⌚️ ChatGPT plugin that allows you to see how websites looked like in the past.

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https://github.com/onrik/gaws

OpenAPI doc generator for Golang

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A set of utils and actions for building APIs following JSON:API specification, based on the league/fractal package

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https://github.com/divvun/divvun-api

Web server for language processing

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https://github.com/goafabric/callee-service

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https://github.com/technologiestiftung/kulturdaten-api

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https://github.com/directus/openapi

OpenAPI Specification for the Directus API

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https://github.com/edoardottt/dalle

Simple Golang Client to interact with Dall-E API

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https://github.com/traefik/hub

Traefik Hub Tutorials

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

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https://github.com/lmhfq/easyopen

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https://github.com/omani/nkn-openapi-client

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https://github.com/jcwillox/typebox-x

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https://github.com/dvurechensky-tools/dotnetify

Turn any OpenAPI (swagger.json) file into a runnable C# (.NET) backend project in seconds.

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https://github.com/jpb06/swagger-typescript-types

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https://github.com/jamdesk/jamdesk-docs

Official Jamdesk documentation — guides, API reference, components, and tutorials for the Jamdesk documentation platform

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https://github.com/fralleee/trpc-breaking-changes-detection

Automatically notify about breaking changes in your tRPC API

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https://github.com/fa0311/palworld-openapi

PalWorld OpenAPI(Swagger) specification using REST API

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https://github.com/chrynan/kapi

Write APIs in Kotlin. Generate Ktor bindings and Open API Specs.

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https://github.com/oguzhane/chrome-devtools-protocol-specs

Chrome DevTools Protocol Specs in form of OpenAPI/Json Schema

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https://github.com/passbolt/passbolt_openapi_specs

Passbolt Open API specifications

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https://github.com/joshuasundance-swca/restgdf_api

openapi-documented arcgis proxy & geospatial data discovery server

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https://github.com/python-lapidary/lapidary-render

Web API client generator

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https://github.com/nightapes/serverless-openapi

Generate openapi file from your serverless file

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https://github.com/leoek/material-safety-search

Search engine for Material Safety Datasheets based on Solr

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https://github.com/ilkka/rust-backend-starter

A backend API starter with Rust & postgres

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https://github.com/JacerOmri/openapi-mcp-proxy

CLI tool to create an MCP server exposing services from an OpenAPI specification

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https://github.com/alexanderadam/fitnesspark_api

API access for Migros Fitnessparks

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https://github.com/jhannes/openapi-generator-java-annotationfree

Generates Java client code from OpenApi specs using openapi-generator. Code is annotation free

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https://github.com/fed135/swagger-route-validator

The fastest route validation middleware

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https://github.com/ianks/dry-schema-extensions

Extensions for dry-schema

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https://github.com/salesforce/anypoint-automation-client-generator

OAS specifications for Anypoint Platform Resources

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https://github.com/softspiders/node-hapi-clean-architecture

A simple API built with Hapi.js that follows Clean Architecture principles

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https://github.com/microsoft/kiota-serialization-json-go

Kiota serialization provider implementation for Go and JSON

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https://github.com/oapicf/pokeapi-clients

A set of generated API clients for Poké API from an OpenAPI v3 specification

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https://github.com/nunchistudio/helix.go

helix.go is the Go implementation of helix, for building cloud-native, consistent, reliable, and high-performance (micro) services with automatic logging, tracing, observability, and event propagation across services and integrations.

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https://github.com/rapter1990/flightsearchapi

Case Study - Flight Search Api (Java 21, Spring Boot, Mongodb, JUnit, Spring Security, JWT, Docker, AOP, Kubernetes, Prometheus, Grafana, Github Actions (CI/CD), Jenkins)

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https://github.com/edavis25/plex-api-spec

Documentation for the Plex Media Server web API.

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https://github.com/opengeospatial/ogcapi-workshop

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https://github.com/opensourcewebsite-org/apidocs-opensourcewebsite-org

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https://github.com/cmdsnr/TempoGPT

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https://github.com/frankkilcommins/describing-api-workflows-with-arazzo

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