Openapi Specification GitHub Repositories (2026) · Open Source Tools

OpenAPI Diff and Breaking Changes

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. 🍺

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

OpenAPI based HTTP Client code generator

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

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

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.

A Typescript framework to help you get an API server up and running with I/O schema validation and custom middlewares in minutes.

A plugin for the Fastify webserver to autogenerate a Fastify configuration based on a OpenApi(v2/v3) specification.

OpenAPI Generator - REST Client Generator

The OpenAPI v3 specification for DigitalOcean's public API.