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/weizhenye/bangumi-restful-api

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https://github.com/teobler/openapi-schema-resolver

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https://github.com/differui/oas-typegen

Generate JSDoc/TS/DTS type definitions from OpenAPI document(V2).

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https://github.com/t-huyeng/openapi-viewer

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https://github.com/seven-io/api-schemes

Official API schemes for seven.io.

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https://github.com/openapi-kr/sdks

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https://github.com/qase-tms/qase-php-client

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https://github.com/profiq/swapi-elixir

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https://github.com/mkloz/bulletproof-express

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https://github.com/clickermonkey/rez

REST (easy) framework in Go with out of the box OpenAPI generation, validation, generics, and much more

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https://github.com/boywithkeyboard-archive/hetzner

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

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https://github.com/jkelleyrtp/onshape-rs

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https://github.com/ditschedev/swag-ts

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https://github.com/mermade/openitv

Open ITVHub and ITV Mercury API SDK

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https://github.com/imp-dance/openapi-to-rtk-query

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https://github.com/i2bskn/schema_serializer

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https://github.com/william-mcgonagle/caramocha

Generate an entire website backend in under a minute.

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https://github.com/Neo1228/spring-boot-starter-swagger-mcp

Turn SpringDoc OpenAPI into production-ready MCP tools for Spring Boot: discovery, validation, workflows, and guardrails.

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https://github.com/erraggy/oastools

OpenAPI Specification (OAS) tools for validating, parsing, fixing, converting, diffing, joining, and building specs; as well as generating client/servers/types from specs.

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https://github.com/specmatic/studio-demo

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https://github.com/igrek8/nestjs-typed-responses

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https://github.com/reprezen/rapidml-readyapi-plugin

RAPID-ML Plugin for Ready! API

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https://github.com/sv-tools/roas

Rust OpenAPI Specification (v2, v3.0, v3.1)

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https://github.com/dominion-framework/dominion

Declarative Promise based Node.js framework for REST API with zero dependencies.

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https://github.com/tryagi/leonardo

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Gradle plugin that ensures specified OpenAPI spec files are fully merged into a main spec via $ref

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https://github.com/jonace-mpelule/openapi-express-decorators

🎉 A lightweight, type-safe library for generating OpenAPI documentation using decorators in Express.js applications. This package allows you to define OpenAPI metadata (paths, parameters, responses, etc.) directly in your controllers using decorators, making it easy to keep your API documentation in sync with your code

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https://github.com/scalar/starter

Scalar Docs Starter Kit

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https://github.com/shnwazdeveloper/shnwazdev-jiosaavn-api

Unofficial ShnwazDev JioSaavn API with Hono, TypeScript, OpenAPI docs, Vercel hosting, and no app-level rate limit.

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https://github.com/idrinth/simple-gateway

A simple and fast nodejs gateway

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https://github.com/zenwave360/zenwave-apimock

Where OpenAPI meets KarateDSL Server Side Features for REST API mocking.

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https://github.com/morka17/api_bank

This project is a standard on how mobile bank backend API services are built.

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https://github.com/kevinthulnith/php-crud-api

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https://github.com/spraakbanken/sb-api-doc

Guidelines for API documentation

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https://github.com/gueff/mymvc_module_openapi

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https://github.com/jorgermduarte/openapi-interface-generator

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https://github.com/jayvirrathi/node-mongodb-rest-api

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https://github.com/oliviagallucci/csec490

🧢➡️🎓

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https://github.com/proxyconf/proxyconf

ProxyConf is a control plane for Envoyproxy that simplifies and secures API management in enterprise environments. It leverages the OpenAPI specification to streamline the configuration of Envoyproxy, providing a powerful yet user-friendly approach for managing, and securing API traffic at scale.

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https://github.com/jhlee0409/openapi-sync-mcp

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https://github.com/wirgen/fastify-openapi-generator

Generate API with fastify by OpenAPI specs

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https://github.com/aldotestino/notion-openapi

Create a Notion database from your OpenAPI document. Automatically map API endpoints, methods, and parameters into a structured Notion DB.

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https://github.com/mihailfox/proxmox-openapi

Tooling to scrape the Proxmox API viewer and generate OpenAPI specifications.

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https://github.com/yoanm/symfony-jsonrpc-http-server-openapi-doc

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https://github.com/xiaojiou176-open/webaudit

Evidence-first browser automation for AI agents and operators, with recovery and MCP.

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https://github.com/arrjunpradeep/ethereum-batch-processing-sdk

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https://github.com/aasaam/openapi-preview

Preview OpenAPI Spec using Swagger UI

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https://github.com/rrjanbiah/legacy2openapi-spec

Legacy to OpenAPI spec conversions of APIs for easy SDK code generations

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https://github.com/juaaloval/postmanassertify

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https://github.com/happybono/businfosystem

Bus Information System for Gyeonggi and Incheon Province, South Korea. NodeMCU (ESP8266) has been used as main microcontroller unit, and displays the bus information on the 0.96" SSD1306 I2C OLED.

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https://github.com/arzzen/openai-product-feed

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https://github.com/quotepedia/api

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