TheOpenAPI Specification (OAS), previously known as theSwagger 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.

The OpenAPI Specification Repository

• UpdatedMar 20, 2025
• Markdown

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

• UpdatedMar 19, 2025
• JavaScript

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

• UpdatedMar 10, 2025
• TypeScript

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

• UpdatedJul 28, 2024

A flexible JSON/YAML linter for creating automated style guides, with baked in support for OpenAPI (v3.1, v3.0, and v2.0), Arazzo v1.0, as well as AsyncAPI v2.x.

• UpdatedMar 19, 2025
• TypeScript

Onmyoji Auto Script | 阴阳师脚本

• UpdatedMar 20, 2025
• Python

OAS-driven Frontend-NoCode Administration Console

• UpdatedMar 19, 2025
• TypeScript

vacuum is the worlds fastest OpenAPI 3, OpenAPI 2 / Swagger linter and quality analysis tool. Built in go, it tears through API specs faster than you can think. vacuum is compatible with Spectral rulesets and generates compatible reports.

• UpdatedMar 19, 2025
• Go

😎 A list of awesome projects related to OpenAPI 3.0.x, curated by the community

• UpdatedMar 20, 2025
• JavaScript

Port OpenAPI Specs to Postman Collections, inject test suite and run via Newman 👨🏽‍🚀

• UpdatedNov 5, 2024
• TypeScript

OpenAPI/Swagger 3.0 Parser and Swift code generator

• UpdatedDec 4, 2023
• Swift

libopenapi is a fully featured, high performance OpenAPI 3.1, 3.0 and Swagger parser, library, validator and toolkit for golang applications.

• UpdatedMar 13, 2025
• Go

OpenAPI Spec Validator is a CLI, pre-commit hook and python package that validates OpenAPI Specs against the OpenAPI 2.0 (aka Swagger), OpenAPI 3.0 and OpenAPI 3.1 specification.

• UpdatedMar 6, 2025
• Python

PHP-code generator for Laravel framework, with complete support of JSON-API data format

• UpdatedAug 8, 2022
• PHP

Openapi-core is a Python library that adds client-side and server-side support for the OpenAPI v3.0 and OpenAPI v3.1 specification.

• UpdatedMar 19, 2025
• Python

API Generator - instantly generate REST and GraphQL APIs (openapi (OAS) 3.0.0)

• UpdatedDec 30, 2022
• JavaScript

An object oriented approach to generating OpenAPI specs, implemented in PHP.

• UpdatedAug 9, 2022
• PHP

RESTest: Automated Black-Box Testing of RESTful Web APIs

• UpdatedFeb 27, 2025
• Java

Tool which generates full picture of coverage of API tests based on OAS (Swagger) v2 and v3

• UpdatedJan 17, 2024
• Java

Concise DSL for generating OpenAPI Specification 3 (OAS3) JSON documentation for Ruby application.

• UpdatedMay 28, 2024
• Ruby