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: 2026-07-02 00:22:14 UTC
JSON Representation

https://github.com/law108000/nestjs-blueprint-crud

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

Preview OpenAPI spec in GitHub Pull Requests

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https://github.com/waler4ik/kk

Golang boilerplate code with a CLI tool: easily create, setup and extend Golang projects.

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https://github.com/eleclink-helix/platform-api

OpenAPI specification for the Platform REST API of Helix

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https://github.com/lams-epfl/gen-rest

A tool to generate automatically OpenAPI specification from a service model

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https://github.com/somenath203/image-generator-backend

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https://github.com/severinglion/spec2lambda

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https://github.com/cubahno/specs

Collection of different OpenAPI specs for testing purposes

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https://github.com/morgbn/nuxt-oa

[BETA] Quickly create API and UI from OpenAPI Specification / JSON schema

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https://github.com/falberthen/koalesce

Koalesce is a .NET distributed library that coalesces multiple OpenAPI definitions into a single document.

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https://github.com/tryagi/mystic

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https://github.com/marianapatcosta/weatherison

Web app developed with VueJS and NodeJS/Express to compare the forecast of different weather apis.

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https://github.com/pilotpirxie/express-endpoints-collection

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https://github.com/tsoa-next/tsoa-next

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https://github.com/mockoon/playground

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https://github.com/maxicorrea/application-desktop-backend

Application Desktop Backend

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https://github.com/sjefvanleeuwen/openapi-identity

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https://github.com/mahmoodhamdi/esports-flask

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