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/nikitakumawat/weather-app.github.io

Weather app using ReactJS and GraphQL

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https://github.com/gabireze/password-generator-api

A flexible and well-structured API for generating secure passwords, built with NestJS. It allows customization of character types, quantity, and output format (JSON, XML, YAML, CSV, text, or HTML).

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https://github.com/uneva/unplugin-openapi-gen-ts

OpenAPI Generated TypeScript

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https://github.com/raulparamio/springclientesapi

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Sample Maven project demonstrating the openapi-collection-generator-maven-plugin — generates Postman and Insomnia collections from an OpenAPI 3.0 Pet Store specification.

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Generate Documentation and Code from OpenAPI Spec.

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https://github.com/tbosak/specbridge

Turn OpenAPI Specs into MCP Tools

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https://github.com/astroway/astroway-php

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https://github.com/xuhaojun/linebotsdkx

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https://github.com/antoniojvargas/smartcar

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Multi-year equity-compensation optimization MCP server + REST API. Six tools (ISO/AMT, NSO, RSU, QSBS, concentration, protective puts). Full federal + 50-state + DC tax code.

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