Openapi3 Open Source Projects

Full stack, modern web application template. Using FastAPI, React, SQLModel, PostgreSQL, Docker, GitHub Actions, automatic HTTPS and more.

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

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

Swagger Editor

Generate Go client and server boilerplate from OpenAPI 3 specifications

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

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

Knife4j is a set of Swagger2 and OpenAPI3 All-in-one enhancement solution

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

Browser extension that generates API specs for any app or website

Huma REST/HTTP API Framework for Golang with OpenAPI 3.1

Language-agnostic HTTP API Testing Tool

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

A fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML

OpenAPI based HTTP Client code generator

Library for OpenAPI 3 with spring-boot

Input OpenAPI. Output SDKs and Docs.

Catch API bugs before your users do

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

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.

Docker image with Uvicorn managed by Gunicorn for high-performance FastAPI web applications in Python with performance auto-tuning.

Sane and flexible OpenAPI 3 schema generation for Django REST framework.

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

Build beautiful, interactive API Docs with embeddable React or Web Components, powered by OpenAPI and Markdown.

A compiler for APIs described by the OpenAPI Specification with plugins for code generation and other API support tasks.

OpenAPI v3 code generator for go

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

Generate modern Python clients from OpenAPI

A node package wrapper for https://github.com/OpenAPITools/openapi-generator

RapiDoc -WebComponent for OpenAPI Spec

A consistent, declarative way of interacting with RESTful backends, featuring code-generation from Swagger and OpenAPI specs 🔥

A library that generates OpenAPI (Swagger) docs from Zod schemas

OpenAPI / Swagger, AsyncAPI & Semoasa definitions to (re)Slate compatible markdown

OpenAPI linting, diffing and testing. Optic helps prevent breaking changes, publish accurate documentation and improve the design of your APIs.

GUI / visual editor for creating and editing OpenAPI / Swagger definitions

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

Restish is a CLI for interacting with REST-ish HTTP APIs with some nice features built-in

OpenAPI Diff and Breaking Changes

Stop half-done APIs! Cherrybomb is a CLI tool that helps you avoid undefined user behaviour by auditing your API specifications, validating them and running API security tests.

A pluggable API specification generator. Currently supports the OpenAPI Specification (f.k.a. the Swagger specification)..

Swagger 2.0 and OpenAPI 3.0 parser/validator

A lightweight Python web API framework.

vacuum is the worlds fastest and most versatile OpenAPI, 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

Utility for comparing two OpenAPI specifications.

A fast Java JSON schema validator that supports draft V4, V6, V7, V2019-09 and V2020-12

Plugin for converting OpenAPI 3.0 specs to the Postman Collection (v2) format

🦋 Auto-validates api requests, responses, and securities using ExpressJS and an OpenAPI 3.1.x or 3.0.x specification

The modern editor for API Design and Technical Writing.

Swagger Spec to Java POJOs

Query, provision and operate Cloud, SaaS, API and Model Context Protocol (MCP) resources through a unified SQL-based framework for humans and AI agents.

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.

OpenAPI 3 schema generator and validator for Cloudflare Workers

Convert Swagger 2.0 definitions to OpenAPI 3.0 and resolve/validate/lint

Lightweight, blazing fast, cross-platform OpenAPI 3 mock server with validation

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