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: 2026-07-05 00:18:41 UTC
JSON Representation

https://github.com/mermade/oas-containers

Docker/podman containers for OAS documentation and registry

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https://github.com/mrtaz77/pantrypal

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https://github.com/govcraft/mistral-rouille

Mistral Client generated from Mistral's OpenAPI spec.

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https://github.com/sigwinhq/openapi-specs

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https://github.com/xutyxd/ts-openapi-contract-first-boilerplate

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https://github.com/cardboardrobots/go-openapi

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https://github.com/quickwrench/quickwrench-api

QuickWrench backend API written using Django ⚡

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For decorating controller endpoints that should be publicly accessible to see within OpenApi generation

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Fastify with OpenAPI and typescript-json-schema example

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https://github.com/soenneker/soenneker.attributes.publicopenapiobject

For decorating objects that should be publicly accessible to see within OpenApi

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https://github.com/ankitboghra/openapi-watchgod-merger

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https://github.com/tahrz/simple-game-api

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https://github.com/mcsym28/liqpay-api-ex

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https://github.com/priyanshscpp/meetwise-app

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https://github.com/renatompf/poc_spring_elasticsearch

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https://github.com/esn8der/todo-app

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https://github.com/miensoap/kishelper

Features for utilizing the KIS Open API

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https://github.com/marcellharmaci/plantfriend-spring

🌱 The Plant Friend project's backend 🌱 implemented in Spring Boot using Java and Maven

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https://github.com/soenneker/soenneker.twilio.openapiclientutil

A thread-safe utility for obtaining Twilio's OpenApiClient singleton.

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https://github.com/alvisooculus/optionsahoy-mcp

Multi-year equity-compensation optimization MCP server + REST API. Six tools (ISO/AMT, NSO, RSU, QSBS, concentration, protective puts). Full federal + 50-state + DC tax code.

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https://github.com/charconstpointer/ihateannotations

Example combining buf, Protobuf, gRPC, gRPC Gateway and OpenAPI

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https://github.com/warfox/products-spring-kotlin-cljs

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https://github.com/libninjacom/nxyz-rs

Nxyz client, generated from the OpenAPI spec

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https://github.com/soenneker/soenneker.telnyx.clientutil

An async thread-safe singleton for the Telnyx OpenApiClient

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https://github.com/pccomponentes/documentation-bundle

The documentation bundle manages the required routes and templates in order to show documentation both in OpenApi and AsyncApi formats.

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https://github.com/kleister/kleister-js

Javascript SDK for Kleister

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https://github.com/t-huyeng/zensus-gis-nrw-api

Zensus 2011 Einwohnerzahlen API

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https://github.com/egonw/grant-api

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https://github.com/egonw/nextprot-openapi-grlc

OpenAPI for NextProt based on SPARQL queries and Grlc annotation

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https://github.com/uneva/unplugin-openapi-gen-ts

OpenAPI Generated TypeScript

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https://github.com/lenivaya/expensify

📊 Modern, full-stack expense tracking application with rich analytics, GDPR-compliant privacy features, and comprehensive budgeting tools. Built with Next.js 15 and NestJS.

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Golang client for the Onfido API

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https://github.com/jpcadena/fastapi-poetry-test

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https://github.com/cicatriiz/cdisc-library-mcp-server

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https://github.com/gabireze/password-generator-api

A flexible and well-structured API for generating secure passwords, built with NestJS. It allows customization of character types, quantity, and output format (JSON, XML, YAML, CSV, text, or HTML).

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https://github.com/natthasath/demo-laravel-scramble

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