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/mcpland/mock-mcp

Mock MCP Server - AI-driven mock data orchestration with OpenAPI JSON Schema for testing

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https://github.com/pprzetacznik/ksef-utils

KSeF Python client for creating invoices

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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

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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/s2-streamstore/s2-protos

gRPC and OpenAPI spec for S2, the Stream Store

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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/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/jiyuujin/vite-react-liff

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

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

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

MCP server for Mockzilla. Let Claude Code, Cursor, and Gemini CLI install Mockzilla, inspect OpenAPI specs, and spin up realistic local mock APIs in seconds. No account required for local use.

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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/mockzilla/connexions

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

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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/electrocucaracha/mcp-openapi-proxy

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

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When keyboard is not enough !!!

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https://github.com/vooft/spektor

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

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https://github.com/borud/nethsm

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https://github.com/de4oult/autumn

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

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https://github.com/skmtc/skmtc

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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/fa0311/twitter-openapi-docs

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

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🌱 Very tiny SPRING Service without Persistence - Also includes a native image build

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

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https://github.com/traefik/hub

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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/lmhfq/easyopen

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

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

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

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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/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

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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/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/ianks/dry-schema-extensions

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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/JacerOmri/openapi-mcp-proxy

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

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

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https://github.com/alexanderadam/fitnesspark_api

API access for Migros Fitnessparks

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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/fed135/swagger-route-validator

The fastest route validation middleware

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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

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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/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/nunchistudio/helix.go

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

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CodeQuery API is a Python/Flask tool designed to serve code-focused AI assistants with the real-time status of a codebase, by allowing seamless querying of a project's file structure and content.

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