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: 2026-07-11 00:22:15 UTC
JSON Representation

https://github.com/woile/drf-serializers

exploring DRF Serializers with OpenAPI

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https://github.com/thanadolps/swarch_rest

Simple REST API Assignment as part of Chulalongkorn 2110521 Software Architecture course.

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https://github.com/ivan-yuldashev/hono-quickstart

An opinionated, production-focused starter for Hono. This template provides an end-to-end type-safe stack, featuring a Modular Architecture, Context-Aware Transactions, Drizzle ORM, PostgreSQL, Zod, and automated OpenAPI documentation.

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https://github.com/kwaytv/hono-steamer-api

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https://github.com/harunrrayhan/todo-node-swagger-api

Node API service using OpenAPI (Swagger)

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https://github.com/iamyasinkaya/morwinyon

Morwinyon, geliştiricilere var olan .NET yazılım projelerine ek işlevsellikler kazandırmak için tasarlanmış bir NuGet paketi uzantısıdır.

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https://github.com/ubill-ge/sdk-ts

TS/JS SDK for working with the UBill API

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https://github.com/planet-a-ventures/affinity-client-python

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https://github.com/phaethix/api-doc-generator

AI-powered API documentation generator — describe your API in plain English, get OpenAPI specs + beautiful docs. Built with Deno + React.

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https://github.com/matthew-shaw/fastapi-vs-flask

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https://github.com/yinchi/openapi-cli

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https://github.com/straylittlepunk/deepl

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https://github.com/ugurcan-aytar/rampart

Cloud-agnostic supply chain incident response engine. One OpenAPI contract, four consumers: Backstage plugin, GitHub Action, CLI, Slack. Go + Rust, stdlib-first.

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https://github.com/lifeiscontent/openapi-sdk

Generate Typesafe SDK from OpenAPI spec

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https://github.com/mlafeldt/go-launchdarkly

Go client library for the LaunchDarkly REST API

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https://github.com/merkys/openapi-3to2

Convert OpenAPI v3 descriptions to v2

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

Skycoin client libraries for Dart

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https://github.com/block65/openapi-codegen

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https://github.com/soenneker/soenneker.trulioo.httpclients

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https://github.com/aahoughton/oav

HTTP-aware OpenAPI 3.0/3.1/3.2 validator with JSON Schema 2020-12 codegen compiler

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https://github.com/roxyapi/sdk-typescript

TypeScript SDK for RoxyAPI. Western astrology, Vedic kundli, tarot, numerology, horoscope, birth chart, I Ching, biorhythm, crystals, dream, and angel number APIs. One key, 10 domains, fully typed. AI agent and MCP ready.

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https://github.com/drewlakee/json-object-openapi-schema

A Kotlin library for converting Json-object into OpenAPI Schema

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

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https://github.com/rubenoalvarado/nestjs-drizzle-template

Project template to work with Drizzle in a NestJs project. It uses config module, throttler for rate limit and a custom drizzle module.

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https://github.com/esn8der/tour-of-heroes-api

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https://github.com/robsonlmds/java-screenmatch

Este projeto é uma aplicação Java que utiliza uma API para buscar informações sobre séries de TV e seus episódios, permitindo que os dados sejam armazenados e listados através de um repositório.

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https://github.com/libninjacom/postman-go

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https://github.com/lsegg/delilah-resto

This project proposes the creation of an online ordering system for a restaurant.

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https://github.com/nasrmohammad4804/ticket-supporting-system

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

Javascript (web & node) client library for the Skycoin API

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https://github.com/swimmwatch/openapi-compare-version

A GitHub Action for comparing OpenAPI specifications version.

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https://github.com/rickyli79/egg-openapi-router

init `router` and connect `controller` by Openapi-doc. validate the request and response by Openapi-doc

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https://github.com/zaydiscold/goodreads-cli

Unofficial CLI + MCP for the full Goodreads API — shelves, ratings, reviews, friends, feed, giveaways (read + write). The API map is the product.

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

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https://github.com/shivam-dhir/unified-payment-gateway

A scalable backend microservice built with Spring Boot to handle secure online payments, supporting multiple payment gateways, real-time processing, and multi-currency transactions with high availability and security.

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https://github.com/marc0franc0/exchangeratesapi

API REST que brinda información actualizada sobre las tasas de cambio de USD y otras monedas en Argentina. También sobre el valor de acciones en USD.

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https://github.com/takeruun/fastify-sample

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https://github.com/owlebot/open-api

Public API to interact with the owle.bot app

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https://github.com/soenneker/soenneker.together.openapiclient

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https://github.com/lloydmeta/elastic-cloud-agent

Elastic Cloud AI agent

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

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https://github.com/soenneker/soenneker.intercom.openapiclient

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

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

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https://github.com/ztrehagem/openapi-to-fastify-schema

Generate schema objects for Fastify from OpenAPI documents

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https://github.com/what3words/what3words-api-docs

Host public Openapi spec and llms files for the what3words Public API

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https://github.com/debitoor/express-openapi

Express Open API

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https://github.com/davidogalo/appointmentscheduler

healthcare appointment scheduling system designed to streamline patient-doctor interactions and medical record management.

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

This project lists items by making a request to JSON Placeholder using React.

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https://github.com/otaviotscha/icarus-bot

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https://github.com/zejnilovic/gh-openapi-preview

A Chrome extension that adds an OpenAPI Preview tab to GitHub’s file view for OpenAPI specs

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https://github.com/aditeyas/grow-your-x

A bot that automatically tweets (posts) on Twitter (X).

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https://github.com/gridaco/postgrest-openapi

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https://github.com/todofixme/openapi-showcases

How different OpenAPI generators might help to build stable REST APIs.

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https://github.com/fern-api/action-postman-sync

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https://github.com/ntrv3390/pdfninja

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https://github.com/pixxiti/oax

Open API Spec validation and client generation tooling for Typescript

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https://github.com/skuong/rclone-rc-api-docs

Easy-to-read Rclone RC API docs using Scalar

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https://github.com/soenneker/soenneker.coinbase.openapiclients.cdp

A Coinbase .NET client generated from their OpenAPI schema, updated daily

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https://github.com/tpdlshdmlrkfmcla/sparta_coding

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https://github.com/met-dev/gamesellingproject

Game Sales Project Backend Side. Tech Stack= ASP.Net, EntityFramework, Code First

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https://github.com/tryagi/runway

C# SDK based on Runway OpenAPI specification

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https://github.com/toliyansky/openapi-spring-generator-example

Example for dev.to article

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https://github.com/soenneker/soenneker.n8n.openapiclient

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https://github.com/thalida/openapi-docs-viewer

Display interactive OpenAPI schema documentation in VSCode

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https://github.com/soenneker/soenneker.cohere.openapiclient

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https://github.com/soenneker/soenneker.render.openapiclient

A .NET client generated from the Render OpenAPI schema, updated daily

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https://github.com/axel7083/electron-vite-react-openapi-generator

electron template using openapi-generator for IPCs communication

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

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

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https://github.com/soenneker/soenneker.stripe.openapiclient

A Stripe .NET client generated from their OpenAPI schema, updated daily

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

A Rebrickable .NET client generated from the Rebrickable OpenAPI schema, updated daily

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https://github.com/soenneker/soenneker.openai.openapiclient

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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/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/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/flkt-crnpio/fastapi-sandbox

Pruebas para crear la documentacion de una API bajo los protocolos de OpenAPI utilizando el framework de FastAPI

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https://github.com/jaqx0r/rules_oapi_codegen

Bazel rules for generating API service handlers with `oapi-codegen`.

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https://github.com/ideadapt/intellij-swagger-annotations

Intellij plugin providing editor features related to swagger and openapi annotations

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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/pidelport/onfido-openapi-rust

Onfido OpenAPI client for Rust

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https://github.com/opensourceways/cora

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https://github.com/gopad/gopad-python

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

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

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https://github.com/ndrsg/openapi-trait

Use rust macros to derive a trait from OpenAPI that you can implement

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

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https://github.com/ke4nec/swagger-ui-electron

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

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

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https://github.com/bretterer/openapi-codegen

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https://github.com/wavix/wavix-openapi

OpenAPI specification for the Wavix API

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https://github.com/libninjacom/petstore-go

Petstore client, generated from the OpenAPI spec

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https://github.com/foncki/time-complexity-calculator

This Chrome extension allows you to easily calculate the time complexity of a function. This tool is useful for software developers looking to optimize their code and improve its performance. With this extension, you can quickly and easily determine the efficiency of your functions and make informed decisions about how to optimize them.

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