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/alexandrelamberty/nidus-api-spec

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https://github.com/mcsym28/liqpay-api-ex

LiqPay API client for Elixir

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

Patroni OpenApi v3 spec

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https://github.com/tomashubelbauer/postgrest-openapi-zapier-fieldschema

Postgrest OpenAPI to Zapier FieldSchema mapper

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https://github.com/renatompf/poc_spring_elasticsearch

This project is a Spring Boot application that demonstrates the integration of PostgreSQL and Elasticsearch for managing and searching product data.

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https://github.com/sonaiengine/api-to-tools

Universal library that converts any API (OpenAPI, WSDL/SOAP, GraphQL, gRPC) into LLM-callable tool definitions

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https://github.com/alvisooculus/optionsahoy-mcp

Multi-year equity-compensation optimization MCP server + REST API. Six tools (ISO/AMT, NSO, RSU, QSBS, concentration, protective puts). Full federal + 50-state + DC tax code.

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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/adrianhdezm/openapi-tools

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https://github.com/mizcausevic-dev/content-workflow-intelligence-platform

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https://github.com/mizcausevic-dev/partner-lead-distribution-engine

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https://github.com/mizcausevic-dev/observability-incident-command-api

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OpenAPI Specification for bunny.net 🐰

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

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

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https://github.com/alejandrosoares/speakwiz

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Generate standalone static Swagger UI sites from OpenAPI specifications.

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https://github.com/rootlyhq/rootly-java

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https://github.com/hmarcuzzo/fastgear

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

:books: Online Bookstore API Specification. Full Stack Web Developer training @ https://technofuturtic.be.

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https://github.com/waterrmalann/openapi-editor

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https://github.com/mermade/openapi2js

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https://github.com/dbwodlf3/graphfl

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https://github.com/apprexp/govsg2oas

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https://github.com/jmcleodfoss/simple-rest-tester

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https://github.com/mesteriis/fullstack-template

Opinionated FastAPI + Vue fullstack template with contract parity checks, ADR-driven governance, and observability baseline.

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https://github.com/antoniojvargas/smartcar

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

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

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

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https://gitlab.com/vuphuong87/symfony-openapi-schema-validator

The OpenAPI schema validator wrapper for Symfony HTTP Request / Response object

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https://github.com/skygenesisenterprise/giteria-licence-xml

A Giteria site to provide non-judgmental guidance on choosing a license for your open source project

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https://github.com/soenneker/soenneker.postman.converter

A utility library that converts Postman schemas to OpenApi

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https://github.com/foo-ogawa/micro-contracts

Contract-first vertical slices for TypeScript Web/API systems. OpenAPI as Single Source of Truth with enforceable guardrails.

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https://github.com/astroway/astroway-python

Official Python SDK for the AstroWay API — sync + async clients, Pydantic models, type-safe, retry-aware, generated from OpenAPI 3.1. Natal charts, synastry, transits, Vedic, Tarot, Human Design, AI horoscopes. Python 3.10+, py.typed.

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https://github.com/dfnwtf/latrinebot

Public Latrine Bot monorepo: docs, SDK, widgets, calculator, CLI. Cloud automation engine for Pump.fun tokens.

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https://github.com/liborm85/swagger-ui-offline-packager

Generates a self-contained HTML file from an OpenAPI definition, rendering it in Swagger UI for offline API documentation.

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

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

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https://github.com/astroway/astroway-php

Official PHP SDK for the AstroWay API — PSR-18 HTTP client (BYO Guzzle/Symfony/Nyholm), DTOs, mock client, PSR-3 logger, Guzzle promises concurrency. Natal, synastry, transits, Vedic, Tarot, Human Design, AI horoscopes. PHP 8.2+.

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https://github.com/martinm85/openapi-dotnet-tools

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https://github.com/kadykov/mcp-openapi-schema-explorer

MCP server providing token-efficient access to OpenAPI/Swagger specs via MCP Resources for client-side exploration.

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https://github.com/dapper91/python-openapi-ui-bundles

This package provides the static files for OpenAPI UI tools as a python package.

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https://github.com/mahabubx7/terry

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https://github.com/openxapi/binance-py

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https://github.com/takeruun/fastify-todo-app

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https://github.com/subzeroid/hikerapi-mcp

MCP server for HikerAPI — 105+ Instagram API tools auto-generated from the OpenAPI spec. Use from Claude Code, Claude Desktop, Cursor, OpenAI Codex, Zed, Windsurf.

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https://github.com/fdeniz07/realestatebackend

Java, Spring Boot 3 based Real Estate Project

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

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

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

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

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https://github.com/mcsym28/open-api-client-ex

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Impact of taxes and social benefits on disposable income

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https://github.com/noppomario/openapispec-collector

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https://github.com/jmpijll/make-code-mode-mcp

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https://github.com/andrii-hrechyn/auto-documentation

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https://github.com/edmartt/workorders

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https://github.com/fvillanuevape/springboot-springfox

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https://github.com/gthomas08/realworld-fastapi

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https://github.com/etherman-os/backcraft

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https://github.com/m-mdy-m/openapi-playground

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https://github.com/wherejuly/60-1-oas-markdown-merger

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https://github.com/viniciusferreira7/url-shortener-api

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https://github.com/0xvbetsun/todo-app

Simple todo-app with documentation and e2e testing via Postman

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https://github.com/nithidol/swagger-converter

Swagger specifications and convert to AsciiDoc and PDF with a custom font.

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Last synced: 26 Feb 2026

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

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

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https://github.com/patarapolw/ts-openapi-fastify

Fastify with OpenAPI and typescript-json-schema example

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https://github.com/fvillanuevape/spring-boot-openapi-oke

Article API Spring Boot and Kubernetes - Spring Boot Open API OKE, es una demo sobre como usar los servicios de kubernetes de oracle cloud para desplegar una API desarrollado en spring boot y de igual manera la documentación de la API usando OAS 3.0.0.

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