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/daleal/asymmetric

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

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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/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/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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Generate sttp client from openapi specification with ease!

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https://github.com/rapter1990/simplebanking

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https://github.com/avicennajr/shellmate

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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

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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/microsoft/kiota-python

Abstractions library for Kiota generated Python clients

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GitBook’s Documentation

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https://github.com/xc0dex/apiweaver

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https://github.com/reprezen/semoasa

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