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/jmcleodfoss/simple-rest-tester

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https://github.com/belgif/openapi-person

OpenAPI data types for person

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

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

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https://github.com/moontai0724/openapi-types

TypeScript types for OpenAPI specification. (v3.1 only now)

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

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https://github.com/impulse-sw/cc-services

Web services and tools for Impulse

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https://github.com/manya7547/insightpdf

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https://github.com/serguun42/airport-frontend

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https://github.com/hozipitol/artifex

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https://github.com/matorikkusu/cleanarchitecture

Clean Architecture Solution Template for ASP.NET Core

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https://github.com/asrieldreemurrgm/microservices_online_selling

A Java 21 Spring Boot microservices platform for managing clients, products, and sales. It leverages MongoDB for persistence, Spring Cloud Config Server for centralized configuration, OpenAPI/Swagger for API documentation, and Feign clients for inter-service communication.

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https://github.com/raulparamio/springclientesapi

Proyecto Java utilizando: Java 17, SpringBoot, Docker, API REST, Hibernate, Swagger, MySQL y Maven.

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https://github.com/asteriskiry/eventsignup_backend

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https://github.com/kossahokia/bankcards

REST API for managing bank cards. Built with Java 21, Spring Boot, PostgreSQL, Liquibase, JWT, Docker, Swagger. Includes full authentication, roles, transfers & admin features.

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https://github.com/0x-jerry/openapi-ts

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https://github.com/alexandrelamberty/nidus-api-spec

:diamond_shape_with_a_dot_inside: Home Automation and Monitoring API Specification using the OpenAPI standard.

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https://github.com/stjoo0925/openapi-test

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

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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/mizcausevic-dev/vapor-saas-billing-engine

Swift Vapor billing engine for subscription lifecycle, proration, dunning, and replay-safe webhook idempotency.

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https://github.com/mizcausevic-dev/content-workflow-intelligence-platform

TypeScript platform for editorial workflow intelligence, publishing readiness scoring, bottleneck visibility, and content operations governance.

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https://github.com/mizcausevic-dev/customer-health-churn-api

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https://github.com/nikitakumawat/weather-app.github.io

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https://github.com/badsyntax/mailinabox-api-php

PHP client SDK for the Mail-in-a-Box API.

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https://github.com/buonzz/ph-locations-api

REST API for serving Cities, Barangays, Provinces and Regions in Philippines

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https://github.com/ismiljanic/otvrac

Repozitorij za predmet "Otvoreno računarstvo" koji sadrži laboratorijske vježbe iz akademske godine 2024./2025.

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https://github.com/domahidizoltan/assessment-faceit

Assessment project for Faceit

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https://github.com/waterrmalann/openapi-editor

An OpenAPI YAML compatible, visual API Documentation tool

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

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

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https://gitlab.com/vuphuong87/symfony-openapi-schema-validator

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https://github.com/dperez3/oapi-generator

Generate OpenAPI documents from multiple Swagger v2 or Open API v3 documents.

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https://github.com/bujosa/alzirr

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https://github.com/sugamkuber/auto-mailer

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

An async thread-safe singleton for Rebrickable OpenApiClient

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https://github.com/dapper91/python-openapi-ui-bundles

This package provides the static files for OpenAPI UI tools as a python package.

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https://github.com/fdeniz07/realestatebackend

Java, Spring Boot 3 based Real Estate Project

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https://github.com/lsanchezvv/swagger-express-api-baseline

Baseline to create a swagger-node-runner project. Uses the openApi standard.

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https://github.com/edmartt/workorders

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https://github.com/gthomas08/realworld-fastapi

A modern FastAPI backend for the RealWorld spec, featuring JWT auth, article management, comments, user profiles, tags, and PostgreSQL support.

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https://github.com/best-shot/json-schema-ref-loader

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https://github.com/wherejuly/60-1-oas-markdown-merger

Expand the OpenAPI JSON specification `description` fields by merging the arbitrary markdown files translated to HTML.

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https://github.com/nithidol/swagger-converter

Swagger specifications and convert to AsciiDoc and PDF with a custom font.

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https://github.com/patarapolw/ts-openapi-fastify

Fastify with OpenAPI and typescript-json-schema example

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https://github.com/fvillanuevape/spring-boot-openapi-oke

Article API Spring Boot and Kubernetes - Spring Boot Open API OKE, es una demo sobre como usar los servicios de kubernetes de oracle cloud para desplegar una API desarrollado en spring boot y de igual manera la documentación de la API usando OAS 3.0.0.

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

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

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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/vincentbollaert/turborepo-playground

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A Node.js CLI tool to measure test coverage of Swagger/OpenAPI specs using Postman collections.

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

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https://github.com/chennqqi/cas_go_sdk

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https://github.com/samgutentag/pyaudius

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

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https://github.com/letehaha/walutomat-sdk

Unofficial SDK clients for the Walutomat API v2.0.0. Walutomat is a Polish peer-to-peer currency exchange platform operated by Currency One. This SDK provides typed clients for their REST API, covering wallet management, transfers, direct FX, and the P2P market order book.

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https://github.com/vaelixbank/vaelix-exchange

The Vaelix Exchange Open Source Platform

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https://github.com/daymade/microservices-management-platform

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