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/qualisero/openapi-endpoint

Exposes type-safe API endpoint functions to Vue components using openapi.json and TanStack

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https://github.com/alexandrelamberty/nidus-api-spec

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https://github.com/walter0329/attributes

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https://github.com/emmrys-jay/micro-order

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https://github.com/cdn77/patroni-openapi

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https://github.com/kemalkochekov/effectivemobiletestproject

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https://github.com/habibun/symfony-api-platform

Symfony with API Platform

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https://github.com/evilurge/openapivalidator

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https://github.com/stjoo0925/openapi-test

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Maven plugin that generates Postman and Insomnia collections from OpenAPI specifications.

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https://github.com/piyush06singhal/weather_app

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https://github.com/valpere/trytrago

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https://github.com/impulse-sw/cc-services

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https://github.com/gabrielcenteiofreitas/express-zod-openapi-typed

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https://github.com/foo-ogawa/micro-contracts

Contract-first vertical slices for TypeScript Web/API systems. OpenAPI as Single Source of Truth with enforceable guardrails.

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https://github.com/dperez3/oapi-generator

Generate OpenAPI documents from multiple Swagger v2 or Open API v3 documents.

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

readme client, generated from the OpenAPI spec.

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A thread-safe singleton HttpClient for OpenAq's OpenAPI integration.

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https://github.com/adam-bouafia/l-aquila-smart-roads-sose

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

A thread-safe singleton HttpClient for CalCom's OpenAPI integration.

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https://github.com/abrehan2/dynamo

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https://github.com/techinpark/jira-cli

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

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https://github.com/bujosa/alzirr

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https://github.com/chennqqi/cas_go_sdk

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https://github.com/nachotoast/uoa-discords

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https://github.com/eliona-smart-building-assistant/go-eliona-api-client

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https://github.com/dacr/counters

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https://github.com/joergschultzelutter/openapi-to-robot-framework-datadriver-testgenerator

Generates a fully-fledged Robot Framework Datadriver test and (optional) Jira/XRay test tickets from an OpenAPI V3 JSON/YAML schema file.

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

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