OpenAPI & Swagger Specs

User-friendly AI Interface (Supports Ollama, OpenAI API, ...)

FastAPI framework, high performance, easy to learn, fast to code, ready for production

Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)

Full-stack web application template with FastAPI, React, SQLModel, PostgreSQL, Vite, Tailwind CSS, shadcn/ui, FastAPI Cloud, and Docker Compose.

Enhanced ChatGPT Clone: Features Agents, MCP, Skills, DeepSeek, Anthropic, AWS, OpenAI, Responses API, Azure, Groq, o1, GPT-5, Mistral, OpenRouter, Vertex AI, Gemini, Artifacts, AI model switching, message search, Code Interpreter, langchain, DALL-E-3, OpenAPI Actions, Functions, Secure Multi-User Auth, Presets, open-source for self-hosting. Active

The OpenAPI Specification Repository

Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

📘 OpenAPI/Swagger-generated API Reference Documentation

gRPC to JSON proxy generator following the gRPC HTTP spec

swagger-codegen contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition.

Scalar is an open-source API platform:　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　🌐 Modern REST API Client　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　📖 Beautiful API References　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　✨ 1st-Class OpenAPI/Swagger Support

Automatically generate RESTful API documentation with Swagger 2.0 for Go.

Automagically reverse-engineer REST APIs via capturing traffic

Swagger Editor

🕸️ Create REST and GraphQL APIs, scaffold Jamstack webapps, stream changes in real-time.

💨 Fast, Async-ready, Openapi, type hints based framework for building APIs

Generate Go client and server boilerplate from OpenAPI 3 specifications

Light, flexible and extensible ASGI framework | Built to scale

Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.

Generate TypeScript types from OpenAPI 3 specs

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

The Swagger/OpenAPI toolchain for .NET, ASP.NET Core and TypeScript.

orval is able to generate client with appropriate type-signatures (TypeScript) from any valid OpenAPI v3 or Swagger v2 specification, either in yaml or json formats. 🍺

Design-first Go framework that generates API code, documentation, and clients. Define once in an elegant DSL, deploy as HTTP and gRPC services with zero drift between code and docs.

Super-fast/easy runtime validators and serializers via transformation

Typesafe APIs Made Simple 🪄

LoopBack makes it easy to build modern API applications that require complex integrations.

👨‍🚀 Turn API specifications into production-ready SDKs, validators, mocks, and more. 20+ plugins. Millions of weekly npm downloads. Used by Vercel, OpenCode, PayPal, AWS, Autodesk, and many more.

Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.

OpenAPI (f.k.a Swagger) Specification code generator. Supports C#, PowerShell, Go, Java, Node.js, TypeScript, Python

The first AI agent that builds permissionless integrations through reverse engineering platforms' internal APIs.

Connexion is a modern Python web framework that makes spec-first and api-first development easy.

🌐 Wikipedia for Web APIs. Directory of REST API definitions in OpenAPI 2.0/3.x format

A simple, secure MCP-to-OpenAPI proxy server

Generate the API Client for Fetch or Axios from an OpenAPI Specification

Huma REST/HTTP API Framework for Golang with OpenAPI 3.1

Build OpenAPI-compliant REST APIs using TypeScript and Node