OpenAPI Specification

The OpenAPI Specification (OAS), previously known as the Swagger 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.

GitHub: https://github.com/topics/openapi
Wikipedia: https://en.wikipedia.org/wiki/OpenAPI_Specification
Repo: https://github.com/OAI/OpenAPI-Specification
Created by: OpenAPI Initiative, Tony Tam, Darrel Miller, Mike Ralphson, Ron Ratovsky, Uri Sarid, Jason Harmon
Released: August 10, 2011
Related Topics: json-schema, raml, rest-api,
Aliases: open-api, swagger-spec, swagger-specification, openapi-spec, openapi-specification, open-api-specification, oas, openapi-description,
Last updated: 2026-06-26 00:18:49 UTC
JSON Representation

https://github.com/mom1/apiclient-pydantic-generator

This code generator creates APIClient app from an openapi file.

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https://github.com/jakubkozera/openapi-ui

A modern, feature-rich OpenAPI/Swagger documentation and testing interface with advanced functionality for API development and testing. Provides interactive API documentation, code generation, collection runner, and multiple distribution formats including ASP.NET Core integration and VS Code extension.

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https://github.com/daleal/asymmetric

Ridiculously fast and easy module-to-API transformations. Learn in minutes, implement in seconds. Batteries included.

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OpenAPI / Swagger UI integration for SAP NetWeaver Gateway

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https://github.com/dasiths/simpleendpoints

A simple, convention-based, endpoint per action pattern implementation for AspNetCore 3.0+ with full support for Swagger

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TypeAPI parser and SDK code generator

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https://github.com/revoltchat/api

Typescript typings and OpenAPI v3 generator for the Revolt API.

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Breaking Cloud Native Web APIs in their natural habitat.

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Spring Boot and Swagger 3 example - configuration for API description / response example - Swagger annotations with OpenAPI 3

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Generate client and server side Java/Kotlin code based on OpenAPI spec

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https://github.com/contractual-dev/contractual

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https://github.com/kolodi/UnityOpenApi

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https://github.com/jamalzeynalov/swagger-coverage-py

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https://github.com/the-codegen-project/cli

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https://github.com/visulima/visulima

Visulima provides robust, developer-focused tools and libraries to streamline your workflow. Let us handle the complexities so you can focus on building what truly matters.

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Web framework plugins for apispec (formally in apispec.ext).

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OpenAPI Definitions

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https://github.com/kota65535/openapi-merger

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https://github.com/sourcemeta/learnjsonschema.com

Reference documentation for JSON Schema. Includes detailed information about each keyword and vocabulary, alongside examples

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Generate sttp client from openapi specification with ease!

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https://github.com/eventuallyconsultant/codegenr

Fast handlebars templates based code generator, ingesting swagger/openapi and other json/yaml documents with $refs, or graphql schema, outputs whatever you template

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A simple tool to generate a ts-rest contract (with zod validation) from an OpenAPI 3.0/3.1 specification.

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https://github.com/rapter1990/simplebanking

Simple Banking App (Spring Boot, Gradle, JUnit, Integration Test, Postgresql, Prometheus, Grafana, Github Actions, Postman)

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A code generation tool for openapi 3 / 3.1 specifications written in typescript, primarily aimed at generating typescript clients and server stubs. Other target languages may be added in future.

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https://github.com/outofcoffee/vertx-oas

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https://github.com/avicennajr/shellmate

Your very own terminal AI assisstant 🤖

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Go package for defining Chi apis (with OpenAPI generated specs)

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Microservice code generator: from OpenAPI (Swagger) REST API specification to TypeScript project with Docker.

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https://github.com/anhthang/soap-converter

Instantly convert SOAP/WSDL definitions to REST API specifications for use with Postman, OpenAPI/Swagger, and other API development tools.

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Start a mock server from an OpenAPI/Swagger spec file

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https://github.com/yusuf-daglioglu/swagger_plugin_example

Example of a Swagger plugin which prints the information from custom Java annotation to Swagger HTML UI.

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https://github.com/long2ice/fibers

Fiber + Swagger = Fibers, a web framework dedicated to providing a FastAPI-like development experience

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https://github.com/aleksandryackovlev/openapi-mock-express-middleware

Generates express mock-servers from OpenAPI specs

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https://github.com/microsoft/kiota-python

Abstractions library for Kiota generated Python clients

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https://github.com/gitbookio/public-docs

GitBook’s Documentation

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https://github.com/redocly/json-to-json-schema

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Interactively exploring API structural changes and versioning consistency

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A CLI tool for generating Elm modules from Open API specs.

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https://github.com/reprezen/semoasa

Specification Extension Metadata for OAS Annotations (Semoasa) is a machine-readable format for extensions to Swagger/OpenAPI 2.0 and 3.0 specifications.

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