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: 2026-04-02 00:18:05 UTC
JSON Representation

https://github.com/sillyash/swagger-ui-clickable-links-plugin

A Swagger UI plugin that automatically makes URLs in descriptions and examples clickable.

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https://github.com/jimsten/ticketflow

High-concurrency booking/ticketing system (MVP first)

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https://github.com/k0lin/apiscope

A modern, web-based OpenAPI documentation platform built with Go and Gin. Upload, version, and share your API specifications with beautiful, interactive Swagger UI documentation.

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https://github.com/mohamed255255/mini-order-tracker

Demo app to create and track orders and payments with a REST API and a SOAP endpoint.

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https://github.com/orca-scan/orca-scan-openapi

Orca Scan OpenAPI Specification

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https://github.com/jonathanscholtes/azure-ai-foundry-databricks-research

Agentic AI solution for exploring and reasoning over Databricks using Azure AI Foundry, Semantic Kernel, OpenAPI, and MCP with full observability and orchestration support.

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https://github.com/quanttide/quanttide-specification-of-network-applications

量潮网络应用标准

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https://github.com/taka-wang/queue-management-system

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https://github.com/skygenesisenterprise/api-web-starter

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https://github.com/seandavi/cmgd_web

Web portal and API for the Curated Metagenomics Data project

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https://github.com/9fv/joi-to-openapi

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https://github.com/localgod/minado

Generating OpenApi specifications and API management policies from Azure Logic App Standard

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https://github.com/pilotak/openapi-typescript-jwt

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https://github.com/libninjacom/sendgrid-rs

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https://github.com/brainstorm/htsget-rust

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https://github.com/thebumpaster/microservice_rest

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https://github.com/swimmwatch/python-opendota

:video_game: Generated Python SDK for working with OpenDota API.

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https://github.com/dperez3/oapi-generator

Generate OpenAPI documents from multiple Swagger v2 or Open API v3 documents.

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https://github.com/diegoaltoworks/ts-node-api

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https://github.com/rocket-org-imdeepmind/redocweb

RocketRedoc is a hosted Redoc UI instance that allows users to visualize and interact with OpenAPI documentation.

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https://github.com/trivigy/oas

Golang OpenAPI Specification definitions

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https://github.com/dreamquality/postman-openapi-schema-validator

A Node.js utility for integrating OpenAPI schema validations into Postman collections. Automatically reads OpenAPI specs (JSON/YAML) and applies schema validation scripts to Postman requests, supporting OpenAPI versions 2.0, 3.0.x. Provides detailed console logging for validation results.

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https://github.com/minterteam/node-grpc-gateway

Minter Node gRPC and REFTful API gateway

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https://github.com/jannikhst/backend_template

TypeScript Express backend template with auth, sessions, API keys, RBAC, auto-generated OpenAPI docs, Prisma, Redis. Production-ready & dockerized.

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https://github.com/soenneker/soenneker.x.clientutil

An async thread-safe singleton for X OpenApiClient

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https://github.com/met-dev/gamesellingproject

Game Sales Project Backend Side. Tech Stack= ASP.Net, EntityFramework, Code First

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https://github.com/iota-uz/payme

IOTA Go client for the Payme Merchant API — work with payments, transactions, and fiscalization in your Go applications. Generated with OpenAPI Generator. Includes support for API key auth, server configuration, and convenient utility helpers.

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https://github.com/asadhasan/fastapi-projections-service

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https://github.com/jkawamoto/go-siastats

A Golang client library for siastats.info

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Spring Boot 3 Reference Design project

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

MCP server for Quiver API

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https://github.com/asteriskiry/eventsignup_backend

Backend Microservice for Eventsignup System

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An OpenAPI 3.1 specification generator for Gin Web Framework

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https://github.com/allansomensi/printer-supplies-api

A simple REST API using Axum for managing printer supplies, such as toners and drums.

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https://github.com/kleister/kleister-js

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https://github.com/2g4/console-ai

Console-based tool to query OpenAI directly, streamlining AI-powered insights from your terminal.

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https://github.com/yszk0123/protobuf-to-openapi-test

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https://github.com/mikeirvingweb/dotnet-open-api-swagger-demo

As demoed at the Dot Net North .NET Conf Local Event in December 2020. A simple overview of Open API and Swagger in .NET

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https://github.com/markrosemaker/errpath

Utilities for creating and managing detailed error paths, allowing users to construct error messages that include the full path to the error. Useful when traversing complex data structures such as JSON or YAML files. Example: components.schemas["Pet"].allOf[0]: invalid schema

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OpenAPI (Swagger) spec for Livingdocs Public API

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https://github.com/just-styx/book-management

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https://github.com/iota-uz/click

IOTA Go client for the CLICK Pass API — work with payments, invoices, and fiscalization in your Go applications. Generated with OpenAPI Generator. Includes support for API key auth, server configuration, and handy utility helpers

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https://github.com/murilobeltrame/springjerseydemoapi

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https://github.com/shockey/awywi

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https://github.com/qualisero/openapi-endpoint

Exposes type-safe API endpoint functions to Vue components using openapi.json and TanStack

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https://github.com/alexandrelamberty/nidus-api-spec

:diamond_shape_with_a_dot_inside: Home Automation and Monitoring API Specification using the OpenAPI standard.

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https://github.com/kandji-community-sdks/kandji-openapi-spec

Creates an unofficial OpenAPI 3.x definition of the Kandji API.

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https://github.com/sambacha/uniswapv4-hooks-openapi

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https://github.com/cdn77/patroni-openapi

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https://github.com/dev-junehee/swimz

수영하는 MZ들을 위한 스웸웨어 쇼핑 플랫폼

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https://github.com/pchchv/strava-cycling-tool

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https://github.com/evilurge/openapivalidator

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https://github.com/stjoo0925/openapi-test

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https://github.com/apskhem/linz

A web framework with first-class OpenAPI documentation support.

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https://github.com/csini/letsgo-blog

A small microservice written in golang. It has a REST api generated from openapi yaml and reads/writes data from database with ORM based gorm. The project uses maven (mvnGolang)

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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/scm-manager/scm-breakingchange-maven-plguin

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https://github.com/alcandev/book-inventory-react-vite-nest-postgres

Full-stack book inventory management system using React + Vite (frontend) and NestJS + PostgreSQL (backend). Features JWT auth, advanced filtering (incl. availability), pagination, CSV export, auditing, Swagger docs, image upload with Multer (local storage), and Docker Compose deployment.

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https://github.com/flkt-crnpio/fastapi-sandbox

Pruebas para crear la documentacion de una API bajo los protocolos de OpenAPI utilizando el framework de FastAPI

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https://github.com/danielterletzkiy/school-api

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https://github.com/intellifi-nl/brain-rest-api-spec

Intellifi Brain REST API spec

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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/soenneker/soenneker.loops.clientutil

An async thread-safe singleton for Loops OpenApiClient

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https://github.com/workloads/pathfinder-openapi-specs

OpenAPI Specs for Pathfinder

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https://github.com/dieperid/bucket-adapter

Bucket Adapter repository for BI1.

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

Just another CLI tool to work with OpenAPI specifications, including generation, validation, and more.

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https://github.com/soenneker/soenneker.dnsimple.contacts

An async thread-safe singleton for DNSimple OpenApiClient's Contacts API

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https://github.com/droidbg/echoai

EchoAI - React Based AI Smooth AI assistant

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https://github.com/belgif/openapi-location

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https://github.com/impulse-sw/cc-services

Web services and tools for Impulse

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https://github.com/ideadapt/intellij-swagger-annotations

Intellij plugin providing editor features related to swagger and openapi annotations

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https://github.com/patricks-js/capybara-hub

Capybara Hub - A simple hotel management system.

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https://github.com/jlarmstrongiv/bunny-sdk-openapi

OpenAPI Specification for bunny.net 🐰

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https://github.com/hoseungme/oas-api-client

API client library generator for Typescript based on OAS(OpenAPI Specification)

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

Visualize your OpenAPI v3 specs as Sankey diagrams. Upload, explore request/response flows, and export as PNG.

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https://github.com/aramzham/hahn.applicatonprocess

It's a simple webApi on .net 5.0 to do some CRUD on applicants.

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https://github.com/fadhlaouir/travelagencybackend

This project is a backend API for a travel agency, providing authentication features such as user registration, login, and logout. It also supports booking flights and hotels, similar to popular travel booking platforms like Booking.com.

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