Openapi31 GitHub Repositories (2026) · Open Source Tools

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

OpenAPI Diff and Breaking Changes

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

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

Huma REST/HTTP API Framework for Golang with OpenAPI 3.1

Javascript library to connect to swagger-enabled APIs via browser or nodejs

⚒️ Redocly CLI makes OpenAPI easy. Lint/validate to any standard, generate beautiful docs, and more.

vacuum is the worlds fastest and most versatile OpenAPI, Arazzo, AsyncAPI & JSON Schema linter, docs generator and toolkit. It tears through API specs at light speed. 100% compatible with Spectral rulesets, and OpenAPI 3.0, 3.1 and 3.2

libopenapi is a fully featured, high performance OpenAPI 3.2, 3.1, 3.0, Overlays and Arazzo parser, library, validator and toolkit for go applications.

The most comprehensive collection of quality OpenAPI tooling, curated by Phil Sturgeon and the team at APIs You Won't Hate.

🤖 Generator for GH repo to help you manage the OpenAPI definition lifecycle

Generate VitePress API Docs from OpenAPI specifications

Detect breaking changes between OpenAPI 3.0/3.1 specs. Explainable Web UI, CLI and CI gate; local-first and deterministic, with optional AI summaries.

Open-source OpenAPI mock server with cloud hosting and local modes for development, testing, and CI. Generates realistic API responses from specs with latency simulation, error injection, proxy fallback, and request validation. Validated against 2,200+ real-world OpenAPI specs.

openapi_first is a Ruby gem for request / response validation and contract-testing against an OpenAPI API description. It makes APIFirst easy and reliable.