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: 2026-02-06 00:24:01 UTC
JSON Representation

https://github.com/whisperpine/tt

An OpenAPI driven rust server.

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https://github.com/chempik1234/golang-microservice-example

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https://github.com/meetup/sbt-openapi

Plugin for generating managed code from OpenAPI specifications

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https://github.com/sosokker/go-chi-oapi-codegen-todolist

Go-Nextjs todolist application with chi server oapi-codegen as handlers template + sqlc for type-safe code from SQL

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https://github.com/fibercrypto/libdart-skycoin

Skycoin client libraries for Dart

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https://github.com/genovaempera/vk-auth

Vkontakte Auth implementation based on OpenAPI. A short profile page and a list consisting of 5 friends of the user.

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https://github.com/distfire/xpresskit

Build scalable backend applications with XPressKit, a TypeScript starter kit using Express.js and Prisma ORM. Ideal for RESTful APIs and microservices. 🚀🌟

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https://github.com/idarkq/redlight-events-manager

A monorepo for the redlight events manager project

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https://github.com/mitaketw/qmi-openapi-java

Qmi OpenAPI for Java

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https://github.com/shekharsikku/hono-scalar

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https://github.com/faluapp/falu-openapi

OpenAPI specification for Falu

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https://github.com/long-woo/otx

stc 的重构版

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https://github.com/iota-uz/eskiz

IOTA Go client for the Eskiz SMS API — send SMS messages worldwide from your Go applications. Generated with OpenAPI Generator. Includes support for token-based auth, server configuration, and handy utility helpers

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https://github.com/vahor/nestjs-zod

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https://github.com/thanadolps/swarch_rest

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

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

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https://github.com/org-metalib/api-wiser

API Wiser is a tool to automate the generation of complete Maven projects for Java applications directly from your OpenAPI Specification, leveraging OpenAPI Tools to accelerate development and ensure consistency.

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https://github.com/rocket-org-imdeepmind/rocketredoc

RocketRedoc is a hosted Redoc UI instance that allows users to visualize and interact with OpenAPI documentation.

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https://github.com/developerkunal/openmorph

OpenMorph: Modern CLI & TUI for safe, interactive OpenAPI vendor extension key transforms with colorized diffs, dry-run, and config merging.

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https://github.com/omani/nkn-wallet

A next generation NKN wallet with built-in age encryption and NKN OpenAPI support.

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https://github.com/azmisahin/azmisahin-software-web-service-rest-postgrest-heskell-v1

Restfull API with OpenApi support, using authentication mechanisms such as JWT, fast integration with devops environments, using powerful postgresql database features

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https://github.com/omermecitoglu/ts-openapi-interface-generator

OpenAPI interface generator for TypeScript

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https://github.com/alejandrehl/tcit-posts-backend

RESTful API for blog post management built with NestJS, TypeScript, and PostgreSQL. Includes modular architecture, robust validation, OpenAPI (Swagger) documentation, and Docker support.

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https://github.com/a-sync/ocap-odata

OData API for OCAP data (ocap-stats database)

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https://github.com/go-api-libs/iss-location

Go library for the ISS Current Location. Provides the current location of the International Space Station (including latitude, longitude, and timestamp) and a list of people currently in space. Users are advised to poll the API no more than once every 5 seconds.

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Template repository for OpenAPI client libraries with JanePHP

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Custom OpenAPI generator that is used to generate swagger documentation using comments.

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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/debitoor/express-openapi

Express Open API

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https://github.com/allansomensi/tickify-api

A simple API for managing support tickets, with JWT authentication. Made in Rust with Axum.

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https://github.com/samuelmendespy/swaggerdc

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https://github.com/bindu-1805/list_items

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https://github.com/webitel/webitel-openapi-client-go

Webitel OpenAPI Client for Go

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https://github.com/mreiche/marketstack-openapi

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https://github.com/aiveraiva/api-documents

The documentation for my api

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https://github.com/andrecaiado/spring-boot-openapi

Spring Boot demo project that implements API documentation using OpenApi specification and API-first approach

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https://github.com/go-api-libs/remote-ok-jobs

Go library for the Remote OK Jobs API. Remote OK is the #1 remote-only jobs board on the web. It has over 30,000+ remote job listings, adding new ones every day. With this API, now you can build apps with our data feed which covers 80% of remote jobs on the web.

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https://github.com/zaiducreatesjarvis/blockchain-event-ticketing-app

Web application for selling tickets using blockchain technology.

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https://github.com/soenneker/soenneker.instantly.runners.openapiclient

Automatically updates the Soenneker.Instantly.OpenApiClient package

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https://github.com/cubicrootxyz/workflows

Collection of commonly used GitHub workflows

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https://github.com/vertilia/router

Highly efficient multi-purpose router library

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https://github.com/arkanatelecom/arkana-dns

Official Arkana DNS Server System

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https://github.com/rihib/www-rihib-dev

[WIP] My Website

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https://github.com/l-ogorzalek/bookstore-java

Final Spring project for university course.

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https://github.com/noi-techpark/opendatahub-swaggerui

Generic Swagger Instance for all Open Data Hub APIs

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https://github.com/tsegreto/openapi-llm-docs

Convert OpenAPI specifications to LLM-friendly documentation format.

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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/hskrasek/arazzo-parser

Parse OpenAPI Arazzo specifications in PHP

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https://github.com/skibidi-crypto/quarkus-openapi-problem

Standardized error responses for Quarkus REST APIs using Problem Details (RFC9457)

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https://github.com/fderuiter/imednet-openapi-spec

imednet rest api openapi spec.

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https://github.com/enricodeleo/aquasdk

Turn OpenAPI into a smooth, chainable SDK – with AquaSDK #OASv3 #openapi3

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https://github.com/mako-framework/open-api

Generate routes based on OpenAPI specifications and OpenAPI specifications from code.

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https://github.com/marigold-dev/tezos-api

Tezos Node API Documentation using ReDoc

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https://github.com/0xvbetsun/todo-app

Simple todo-app with documentation and e2e testing via Postman

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https://github.com/msaleme/utility-ai-mulesoft-api

AI-powered MuleSoft API platform enabling 10-minute grid recovery for utilities. Integrates SCADA, weather, DER, and field systems with autonomous agent coordination. -15M annual ROI through 85% outage reduction.

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https://github.com/mitre/cyber-trackr-live

OpenAPI specification and Ruby client for cyber.trackr.live API

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https://github.com/gribbirg/application-programming-interface

Practice works of API course, RTU MIREA

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https://github.com/abhishek-sharma-dev-13/translation-management-service

Manage translations effortlessly with our Laravel API service. Enjoy multi-locale support, advanced tagging, and high performance. 🌍🚀

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A high-performance Laravel-based API service for managing translations across multiple locales with advanced tagging and search capabilities

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https://github.com/astron-collection/astron-mail

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https://github.com/iyxan23/openapi-example

🛜 an example of API-first development with OpenAPI. with an ExpressJS backend, and Flutter frontend.

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https://github.com/vinitshahdeo/newrelic-to-postman

Convert New Relic transaction to Open API definition or Postman collection

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https://github.com/rustmailer/rustmailer-core

A Rust-based service for sending and managing emails via SMTP and IMAP, with OpenAPI and gRPC interfaces for modern applications.

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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/22bcaf47/schematica-frontend

This repository holds the frontend source code for Schematica, a modern API documentation platform designed for collaboration between backend and frontend teams. Explore the features and quirks that make this tool user-friendly and efficient. 🐙✨

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https://github.com/saikiran6694/dall-e-image-generation

Dall -E-AI clone for Image Generation from the given prompt, developed using ReactJS, NodeJS, Express, OpenAI and Cloudinary.

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

Kleister: SDK for Golang

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https://github.com/hw0k-play/openapi-codegen-example

OpenAPI Codegen for TypeScript

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https://github.com/danhunsaker/openapi2siege

A simple tool to convert your OpenAPI spec(s) to one or more Siege URL files

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https://github.com/ambrosiaandrade/pets

Pet Project is a Spring Boot backend app showcasing clean architecture, Kafka integration, async endpoints, and CI/CD with GitHub Actions. Ideal for learning and prototyping modern backend features.

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https://github.com/cedricziel/bondora-openapi-php

Generated client for the Bondora API

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

benchling client, generated from the OpenAPI spec

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https://github.com/ashutoshsahoo/gs-spring-boot3-open-telemetry

Spring Boot 3 with Open Telemetry

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https://github.com/ricardozanini/openapi-codegen-poc

Proof Of Concept of OpenAPI Generator Embedded Codegen with Serverless Workflow SDK

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https://github.com/locol23/swagger-github-pages

Visualize open api yaml with swagger-ui and deploy to GitHub pages

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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/bcrikko/openapi-typed-client

Type-safe API client using OpenAPI-like schema

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https://github.com/aporthq/aport-integrations

🛡️ Community-built integrations, SDKs, and tools for APort - the neutral trust rail for AI agents. Join Hacktoberfest 2025!

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lorem-ipsum service with API

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https://github.com/dweber019/spring-sleuth-example

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https://github.com/lornajane/apitapviz

Simple visualisation of OpenAPI Arazzo files as Markdown or mermaidjs. (Mirror of the main apitapviz repo)

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https://github.com/sukkola/openapiv3-filter

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https://github.com/quiddlee/nodejs-home-library-service

🏡 Node.js Home Library Service

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https://github.com/nsubrahm/parl

The PARL approach for microservices

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https://github.com/tsapporg/openapi-includer-cli

Add $includes keyword support to OpenAPI specs to include files for certain parts of the spec - like paths - which $ref normally does not support.

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https://github.com/rudradcruze/currencyconverter

Simple Spring Boot Application Where I Called Third Party API To Convert The One Currency To Another Currency And Also Log Those And Use Actuator And Swagger UI

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https://github.com/bartosz-ziolkowski/spotify_clone

Spotify clone

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https://github.com/jdifool/tempest-openapi-tools

OpenAPI specification generator and interactive documentation UI for the Tempest framework.

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https://github.com/mzubairtahir/polling-system

This is a learning project—a web application that enables users to create polls between two individuals to determine who has a larger network and garners more votes.

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