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: 2026-07-08 00:22:40 UTC
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https://github.com/soenneker/soenneker.sentry.openapiclientutil

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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https://github.com/definancy/definancy-spec

Definancy contract — OpenAPI wire spec + cross-language conformance suite

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https://github.com/cl0v1s/openapi-mcpify

Turn any OpenAPI spec into a live MCP server — with built-in confirmation prompts for mutating operations.

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https://github.com/merkys/openapi-render

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https://github.com/tonystrawberry/playground.openapi.generator

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https://github.com/netgen/openapi

Netgen's OpenAPI implementation

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https://github.com/badsyntax/lamernews-api-client

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

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https://github.com/huksley/swagger-explorer

Run Swagger UI locally against a folder of OpenAPI or Swagger specifications

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https://github.com/foxfriends/openfetch

Fetch-like OpenAPI client library

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https://github.com/ricardozanini/openapi-codegen-poc

Proof Of Concept of OpenAPI Generator Embedded Codegen with Serverless Workflow SDK

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https://github.com/jimsten/ticketflow

High-concurrency booking/ticketing system (MVP first)

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https://github.com/nakasar/serverless-api-doc-generator

Generate Documentation API from serverless.yml and JS docstrings.

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https://github.com/valerii15298/openapi-spec

OpenAPI Specification Rendered with Astro Starlight

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https://github.com/elipzis/aping

📲 A simple API Ping tool to feed a Swagger/OpenAPI 3.0 document file, call all paths and record time and responses

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https://github.com/k8scat/fxiaoke

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https://github.com/leanhanc/hono-betterauth-openapi-starter

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

exploring DRF Serializers with OpenAPI

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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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