Swagger GitHub Repositories (2026) · Open Source Tools

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

Catch API bugs before your users do

Simple, Fast, Code first and Compile time generated OpenAPI documentation for Rust

OpenAPI Diff and Breaking Changes

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

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. 🍺

Generate Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON/YAML/CSV.

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

OpenAPI 3.0 and 3.1 and 3.2 (and Swagger v2) implementation for Go (parsing, converting, validation, and more)

🧡 Turn your API spec into type-safe code. Generate TypeScript types, API clients, hooks, validators and mocks from a spec such as OpenAPI.

Light, flexible and extensible ASGI framework | Built to scale

The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀

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

gRPC to JSON proxy generator following the gRPC HTTP spec

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

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

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.

NestJS boilerplate. Auth, TypeORM, Mongoose, Postgres, MongoDB, Mailing, I18N, Docker.

A fast, lightweight and more productive microservices framework

OpenApi or Swagger integration to Laravel