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: 2026-03-25 00:22:16 UTC
- JSON Representation
https://github.com/iscc/iscc-schema
ISCC - JSON-LD Metadata and OpenAPI Service Descriptions
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https://github.com/reslava/nuget-package-reslava-result
Railway-oriented programming for .NET. Handle errors without exceptions, compose async pipelines, and generate Minimal API endpoints automatically. Result<T>, OneOf, Maybe, LINQ syntax, and Roslyn analyzers — all in one zero-dependency package.
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https://github.com/99x-incubator/remarkable-2-llm
Integrating LLMs into reMarkable could unlock transformative features like auto-completion, grammar/style corrections, contextual suggestions, and note summarization or paraphrasing. These tools would enhance productivity and elevate the user experience, making the device a powerful ally for creative and professional tasks.
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https://github.com/t-huyeng/geoportal-openapis
List of OpenAPI files from Geoportals (HE, RLP, SL)
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https://github.com/smridge/swagcov
OpenAPI documentation coverage check for Rails Routes.
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https://github.com/bcrikko/express-openapi-sample
express-openapiを使ってRESTful APIを実装する
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https://github.com/lavantien/go-laptop-booking
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https://github.com/jskov/openapi-jaxrs-client
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https://github.com/kripod/fxhu
Exchange rates API sourced from the National Bank of Hungary (Magyar Nemzeti Bank, MNB). Unlimited & CORS-enabled.
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https://github.com/grohden/openapi-ts-generator
OpenAPI codegen for TS
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This project demonstrates contract-first development using a spec-kit approach where OpenAPI specifications evolve organically through feature development. Each feature analyzes existing contracts for reuse before extending the API, using Specmatic MCP as intelligent guardrails throughout the process.
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Tidepool APIs documented with OpenAPI v3, for schema validation and client and server code generation.
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Immutable X and Gods Unchained OpenAPI 3.0 definitions
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Codewars OpenAPI Specification
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Garden assistant, for your seedlings and vegetables. Compatible with Home Assistant & Google Home.
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Bleemeo Python SDK
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https://github.com/xdev-software/sessionize-java-client
Java client for the Sessionize API
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Node.js starter app, 2024 edition
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Koa middleware to handle OpenAPI 3.x.
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https://github.com/eth-library/opendata-apis
Open API Specifications for open data APIs of ETH Library. See https://developer.library.ethz.ch for more informatione about APIs and how to access.
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https://github.com/e-miracle/kudaping
Kudaping — A Laravel Package for Kuda Bank Open API
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https://github.com/uzimaru0000/oreq
The tool for interactively creating curl arguments from OpenAPI.
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https://github.com/carapacik/superheroes
Search for superheroes
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https://github.com/whispir/openapi
An OpenAPI description of the Whispir API
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https://github.com/payroll-engine/payrollengine.backend
Payroll Engine Backend Server Service
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https://github.com/ryan-gordon/elasticsearch-crud-openapi
OpenAPI documented REST API for contacting ElasticSearch.
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https://github.com/freb97/autodisco
🪩 Use legacy APIs with confidence
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https://github.com/reiterus/swagger-symfony
OpenAPI format of REST API Endpoints for a Symfony based project
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https://github.com/himenon/openapi-typescript-practice
OpenAPIを利用したAPI作成と、開発、リリースフローまでの仕組みづくりの練習
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https://github.com/d1vbyz3r0/typed
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https://github.com/intesys/generator-jhipster-apiutils
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https://github.com/captn3m0/kuvera-unofficial-api-specification
Unofficial Specification for the Kuvera read APIs
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https://github.com/wtx-labs/woocommerce-api-openapi-specification
The WooCommerce REST API specification in OpenAPI 3.0 format
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https://github.com/bvwells/grpc-gateway-example
Example usage of gRPC gateway
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RESTful HTTP endpoints to RxInfer
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Use Zally to validate OpenAPI specs in a Gradle project
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https://github.com/timakro/apispec-swaggerinherit
Plugin for apispec adding support for Swagger-style inheritance using `allOf`
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https://github.com/oai/stories
Submit ideas, writing, and publishing stories about the OpenAPI specification.
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https://github.com/rookie-luochao/create-vite-vue-app
build vue webapp by vue3 + ts + openapi + docker, this is a sub-template of create-vite-app-cli
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https://github.com/yonatankarp/openapi-usage-example
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https://github.com/sumup/openapi
An OpenAPI specification for the SumUp API.
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Demos for M4(Backend) Henry Bootcamp
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Laravel integration for Membrane validation library.
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https://github.com/kicksolutions/mockswagger
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OpenAPI viewer component for VueJS
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https://github.com/devatherock/api-specs
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https://github.com/arduino/clients-iot-api
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https://github.com/abraham/mastodon-openapi
Mastodon API OpenAPI spec parsed from the Mastodon markdown docs.
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https://github.com/podhmo/reflect-openapi
Define OpenAPI with reflect package
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https://github.com/easymetahub/emh-marklogic-glossary
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https://github.com/husniadil/next-swagger-ui
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https://github.com/alextselegidis/easyappointments-sdk
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https://github.com/useapi/midjourney-api
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https://github.com/redocly/apidocs-starter
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https://github.com/rwth-acis/openapi-link-generator
Automatically add link definitions to Swagger/OpenAPI documentations
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https://github.com/codemage66/php-crud-api
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https://github.com/manifoldfinance/eth2docs
Ethereum2 Beacon, Execution and Consensus client APIs documentation
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https://github.com/jaxelr/nancy.template.webservice
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https://github.com/bump-sh-examples/rails-design-first
Speed up your Rails API development with OpenAPI request validation and contract testing.
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https://github.com/zchee/openapi2protobuf
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