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/humbertodias/mn-kotlin-openapi-helloworld

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https://github.com/aditeyas/grow-your-x

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https://github.com/todofixme/openapi-showcases

How different OpenAPI generators might help to build stable REST APIs.

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https://github.com/fern-api/action-postman-sync

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The documentation bundle manages the required routes and templates in order to show documentation both in OpenApi and AsyncApi formats.

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OpenAI OpenAPI Specification - Kotlin

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https://github.com/foncki/time-complexity-calculator

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https://github.com/n8n-code/n8n-nodes-ondo-finance

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Audit whether agents can find, call, trust, price, and defend your B2B product.

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Personal MCP gateway for combining MCP servers and OpenAPI APIs on Cloudflare Workers with Code Mode.

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https://github.com/roxyapi/postman-collections

Postman collections for astrology, Vedic, tarot, numerology, I Ching, biorhythm, Human Design and more. Auto synced from OpenAPI, one API key.

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Deterministic OpenAPI spec generation for RequestTracker REST 2.0 API

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A MockServer expectation initializer that turns OpenAPI x-mockserver-scenarios extensions into executable MockServer expectations at startup.

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https://github.com/glebmish/intervals-icu-cli

Command-line client for the intervals.icu training API, built for AI-agent use. 148 operations.

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https://github.com/faisalaffan/community-waste-collection-api

REST API for community waste collection — households, pickups, payments, and reports. Built with Go Fiber

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https://github.com/subzeroid/lamatok-mcp

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

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https://github.com/astroway/astrology-api-openapi

OpenAPI 3.1 spec for the AstroWay astrology API — natal charts, synastry, transits, Vedic, Human Design, Tarot, Numerology. Generate a typed client in any language.

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

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https://github.com/sebavidal10/le-chat-openai

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https://github.com/yfedoseev/pdf_oxide_api

The fastest, smallest, most secure self-hostable PDF REST API — stateless single-shot HTTP service wrapping the pdf_oxide Rust engine (text/markdown/html extraction, AcroForm fill with first-class Japanese/CJK, merge/split, pipeline). Distroless Docker, ~8-16MB.

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https://github.com/phaethix/api-doc-generator

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An async thread-safe singleton for HighLevel OpenApiClient.

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https://github.com/wavix/wavix-openapi

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https://github.com/sirerun/mint

mint is an open-source Go CLI that turns any OpenAPI 3.0/3.1 specification into a working Go MCP server.

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https://github.com/soenneker/soenneker.cloudflare.openapi.suite

A comprehensive suite of utility libraries for Cloudflare's OpenApi operations

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https://github.com/davidsteiner/orator

Rust server stub generation from OpenAPI 3.1 specs

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https://github.com/soenneker/soenneker.openapi.fixer

A utility that fixes problem OpenApi specs being converted into clients

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

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https://github.com/soenneker/soenneker.instantly.clientutil

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https://github.com/aihxp/sumac

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https://github.com/samuele-barbiera/kubb-gen-scribe-cli

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https://github.com/zemloai-ctrl/zemloai-api

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