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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.

Here are 327 public repositories matching this topic...

RicoSuter / NSwag

The Swagger/OpenAPI toolchain for .NET, ASP.NET Core and TypeScript.

angular typescript csharp aurelia dotnet aspnetcore aspnet swagger openapi codegen webapi nswag

Updated Jan 3, 2026
C#

microsoft / kiota

OpenAPI based HTTP Client code generator

ruby python java api golang php http typescript csharp dotnet openapi hacktoberfest openapi-specification openapi3 openapi-codegen kiota

Updated Jan 29, 2026
C#

dotnetcore / WebApiClient

A REST API library with better functionality, performance, and scalability than refit

client json xml restful retrofit swagger openapi form httpclient webapi oauth2-client json-rpc-client refit webclient

Updated Dec 14, 2025
C#

microsoft / OpenAPI.NET

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model.

http openapi

Updated Jan 29, 2026
C#

dotnet / dev-proxy

Simulate API failures, throttling, and chaos — all from your command line.

http development rest proxy mock-server devtools openapi developer-tools api-testing hacktoberfest resilience microsoft-graph chaos-engineering dev-proxy microsoft-365

Updated Jan 29, 2026
C#

VedAstro

VedAstro / VedAstro

A non-profit, open source project to make Vedic Astrology easily available to all.

api chat open-source machine-learning opensource ai openapi swisseph non-profit astrology panchanga swiss-ephemeris horoscope vedic astrology-api muhurat panchangam chatgpt-api

Updated Jan 4, 2026
C#

Azure / azure-functions-openapi-extension

This extension provides an Azure Functions app with Open API capability for better discoverability to consuming parties

azure openapi azure-functions swagger-ui hacktoberfest power-platform

Updated Oct 3, 2025
C#

christianhelle / refitter

A tool for generating Refit interfaces and contracts from OpenAPI (Swagger) specifications

rest swagger openapi refit openapi3 csharp-sourcegenerator

Updated Jan 30, 2026
C#

LEGO / AsyncAPI.NET

The AsyncAPI.NET SDK contains a useful object model for AsyncAPI documents in .NET

dotnet openapi asyncapi

Updated Jan 15, 2026
C#

synapse

serverlessworkflow / synapse

Serverless Workflow Management System (WFMS)

graphql docker kubernetes cli workflow ui rest runtime websocket grpc openapi odata asyncapi cloudevents serverless-workflow wfms

Updated Jan 1, 2026
C#

anuraj / MinimalApi

ASP.NET Core 10.0 - Minimal API Example - Todo API implementation using ASP.NET Core Minimal API, Entity Framework Core, Token authentication, Versioning, Unit Testing, Integration Testing and Open API.

unit-testing jwt sql-server aspnetcore xunit swagger openapi dotnet-core entity-framework-core aspnet-core asp-net-core jwt-authentication webapi

Updated Dec 18, 2025
C#

helldivers-2 / api

A community driven API for Helldivers 2

api community json json-api openapi unofficial helldivers unoffical-apis helldivers-2

Updated Dec 4, 2025
C#

Kaliumhexacyanoferrat / GenHTTP

Lightweight embeddable web server written in pure C# with few dependencies to 3rd-party libraries.

http embedded web-server csharp server dotnet nuget webserver websockets openapi http-server webservices http-rest-api embedded-server net8 dotnet8 dotnet10 net10

Updated Jan 26, 2026
C#

asyncapi / saunter

Saunter is a code-first AsyncAPI documentation generator for dotnet.

documentation dotnet aspnetcore amqp openapi asyncapi

Updated Jan 27, 2026
C#

Redocly / openapi-starter

OpenAPI starter repository

template boilerplate swagger openapi openapi3 api-reference openapi31

Updated Jan 27, 2026
C#

christianhelle / apiclientcodegen

A collection of Visual Studio code generators for Swagger / OpenAPI specification files

code-generator swagger openapi api-client autorest visual-studio-extension openapi-specification rest-client openapi3 nswag openapi-generator swagger-codegen-cli kiota visual-studio-mac-extension

Updated Jan 29, 2026
C#

microsoft / OpenAPI.NET.CSharpAnnotations

Generates OpenAPI Document from C# Annotations

csharp openapi

Updated Aug 29, 2022
C#

tryAGI / Ollama

Ollama SDK for .NET

api sdk rest ai csharp local dotnet openapi netstandard20 rag net6 llm langchain openapigenerator net8 ollama langchain-dotnet

Updated Jan 26, 2026
C#

marcominerva / MinimalHelpers

A collection of helpers libraries for Minimal API projects.

visual-studio csharp aspnetcore routing swagger openapi net hacktoberfest minimal-api minimalapi minimalapis

Updated Jan 14, 2026
C#

unchase / Unchase.Swashbuckle.AspNetCore.Extensions

🔨 A library contains a bunch of extensions (filters) for Swashbuckle.AspNetCore.

swagger openapi swashbuckle

Updated Dec 17, 2024
C#

Created by OpenAPI Initiative, Tony Tam, Darrel Miller, Mike Ralphson, Ron Ratovsky, Uri Sarid, Jason Harmon

Released August 10, 2011

Latest release 4 months ago

Followers: 164 followers
Repository: OAI/OpenAPI-Specification
Website: github.com/topics/openapi
Wikipedia: Wikipedia

Related topics

json-schema raml rest-api