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/otaviotscha/icarus-bot

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https://github.com/zejnilovic/gh-openapi-preview

A Chrome extension that adds an OpenAPI Preview tab to GitHub’s file view for OpenAPI specs

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https://github.com/aditeyas/grow-your-x

A bot that automatically tweets (posts) on Twitter (X).

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

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https://github.com/fern-api/action-postman-sync

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https://github.com/ntrv3390/pdfninja

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Open API Spec validation and client generation tooling for Typescript

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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/mermade/api-registry

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

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https://github.com/abdallahsaber065/openapi-tester-frontend

A clean, user-friendly frontend application for testing any OpenAPI-compliant API dynamically. This tool loads your API specification from OpenAPI JSON files or URLs and provides an intuitive interface for testing all endpoints without needing external tools like Postman.

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

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

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

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

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

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

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

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https://github.com/iqbalmind/jurnal-api-example

A collection of example integrations with the Mekari Jurnal Open API using different Code & frameworks. This repository aims to help developers quickly understand and implement Jurnal API integrations across various environments.

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https://github.com/swooby/openai-openapi-kotlin

OpenAI OpenAPI Specification - Kotlin

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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/grparry/swaggertomcp

🔁 Convert Swagger/OpenAPI specs into Model Context Protocol (MCP) tool definitions for agentic AI compatibility.

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https://github.com/pidelport/onfido-openapi-rust

Onfido OpenAPI client for Rust

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

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An async thread-safe singleton for Loops OpenApiClient

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A utility library to merge OpenApi specs

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Extendable Swagger Code Generator for PHP

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A Spring Boot 3 RESTfull API sample

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https://github.com/foncki/time-complexity-calculator

This Chrome extension allows you to easily calculate the time complexity of a function. This tool is useful for software developers looking to optimize their code and improve its performance. With this extension, you can quickly and easily determine the efficiency of your functions and make informed decisions about how to optimize them.

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

Bump.sh client, generated from the OpenAPI spec

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https://github.com/foospidy/postman-to-openapi-docker

Run postman-to-openapi from a docker container

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https://github.com/n8n-code/n8n-nodes-odoo-v17

Odoo v17 is an all-in-one open-source ERP for managing all aspects of business in a single platform

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https://github.com/marvinvista/agentic-ready

Audit whether agents can find, call, trust, price, and defend your B2B product.

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https://github.com/roxyapi/postman-collections

Postman collections for astrology, Vedic, tarot, numerology, I Ching, biorhythm, Human Design and more. Auto synced from OpenAPI, one API key.

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https://github.com/dhslegen/disciplined-delivery-toolkit

Claude Code plugin: superpowers discipline + toB delivery governance — 5-station spine (need→contract→implement→verify→deliver), Iron Law file-fact enforcement, SSoT accountability, ROI reporting. Zero deps.

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Deterministic OpenAPI spec generation for RequestTracker REST 2.0 API

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https://github.com/h0rv/zchema

Typed, validated JSON APIs and OpenAPI 3.1 for Zig's std.http.Server

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https://github.com/tarundattagondi/mcp-curate

Turn an OpenAPI/Swagger spec into a high-quality, curated MCP server — consolidates endpoints into clear tools and proves it with an eval harness.

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Automatic OpenAPI 3.1 specification generator and documentation middleware for the MonkeysLegion framework.

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FastAPI React Todo

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The OpenAPI declaration of RadioBrowser JSON API

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https://github.com/glebmish/intervals-icu-cli

Command-line client for the intervals.icu training API, built for AI-agent use. 148 operations.

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https://github.com/osisdie/dotnet-webapi-cqrs-boilerplate

Production-ready .NET WebAPI framework (CoreFX) with MediatR (CQRS), FluentValidation, JWT auth, OpenAPI/Swagger, email notifications (MailKit), Docker multi-stage build, and xUnit testing. Multi-targets net8.0 + net10.0.

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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/davidmosiah/delx-agent-utilities

Open-source stateless utility tools for AI agents: URL, DNS, TLS, OpenAPI, x402, JWT, CSV/JSON, cron, and composite reports.

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https://github.com/yfedoseev/pdf_oxide_api

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https://github.com/phaethix/api-doc-generator

AI-powered API documentation generator — describe your API in plain English, get OpenAPI specs + beautiful docs. Built with Deno + React.

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

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https://github.com/sigpwned/diffbot-openapi-spec

Community OpenAPI Spec for Diffbot API

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https://github.com/seabed-labs/drip-client

Generated API Clients for the Drip Backend

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https://github.com/mikeralphson/openapi-diff

Mirror of Atlassian's OpenAPI Diff (from bitbucket.org)

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https://github.com/letehaha/walutomat-sdk

Unofficial SDK clients for the Walutomat API v2.0.0. Walutomat is a Polish peer-to-peer currency exchange platform operated by Currency One. This SDK provides typed clients for their REST API, covering wallet management, transfers, direct FX, and the P2P market order book.

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https://github.com/g-nelson1/tiingo-openapi

Tiingo OpenAPI Doc

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https://github.com/vaelixbank/vaelix-exchange

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

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

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https://github.com/neelkamath/backend-prototype

⏩ Template for backend prototypes

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https://github.com/viniciusferreira7/bun-auth

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https://github.com/daymade/microservices-management-platform

Service Catalog Demo is a microservice API management platform written using golang and vue, where users can manage services and versions through a frontend dashboard.

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https://github.com/controlplane-com/types-ts

Control Plane TypeScript type definitions for type-safe API interactions

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https://github.com/andyfrith/weather-api

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

A National Weather Service (NWS) .NET client generated from their OpenAPI schema, updated daily

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https://github.com/murilobeltrame/springjerseydemoapi

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https://github.com/wronai/allama

testing and benchmarking suite for Large Language Models (LLMs) focused on Python code generation. The project enables automatic quality assessment of generated code through various metrics and generates detailed HTML reports.

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

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https://github.com/soenneker/soenneker.resend.openapi.suite

A comprehensive suite of utility libraries for Resend's OpenApi operations

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https://github.com/wilson0x4d/tornado-openapi

..an OAS-generation library for Tornado.

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https://github.com/samuele-barbiera/kubb-gen-scribe-cli

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https://github.com/inyourtime/fastify-multiple-swagger

A Fastify plugin for generating multiple Swagger/OpenAPI documents using @fastify/swagger.

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https://github.com/zaiducreatesjarvis/blockchain-event-ticketing-app

Web application for selling tickets using blockchain technology.

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https://github.com/thavarshan/orthrus

⛨ A production-ready, multi-tenant JWT authentication service built with Symfony 7.3 and PHP 8.2+.

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

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

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

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

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https://github.com/zemloai-ctrl/zemloai-api

Zemlo ZQP v1.0 Lite – The First AI-Agent Optimized Logistics Infrastructure. Provides deterministic market signals, situational awareness, and automated risk analysis via a no-auth API. Built to be the "Logistics PageRank" for autonomous agents and humans alike.

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