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Microsoft.AspNetCore.OpenApi package icon

Microsoft.AspNetCore.OpenApi

v9.0.15

Provides APIs for annotating route handler endpoints in ASP.NET Core with OpenAPI annotations. This package was built from the source code at https://github.com/dotnet/aspnetcore/tree/324a351f7f1ae6c17b6a8661903e2a7921a7d75c

aspnet dotnetframework Microsoft
aspnetcore openapi
NuGet Stats Changelog
Total Downloads
237.8M
237,839,740
Published
Apr 14, 2026
Latest stable version

Install

.NET CLI
dotnet add package Microsoft.AspNetCore.OpenApi --version 9.0.15
Package Manager Console
Install-Package Microsoft.AspNetCore.OpenApi -Version 9.0.15
PackageReference
<PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.15" />

Frameworks

net9.0

Dependencies

Microsoft.OpenApi
net9.0
[1.6.17, )

Adoption guide

Teams staying close to first-party ASP.NET Core primitives and minimal external framework layering.

ASP.NET Core guide
Why it appears in the guide: First-party OpenAPI generation support aligned with modern ASP.NET Core hosting patterns. Trade-off: Feature customization depth may require additional conventions or complementary packages.

Compatibility metadata lists 1 target framework; confirm the exact target used by your application.

How to read this guidance

Sources: published NuGet v3 registry metadata and explicit NuBrowse editorial guides. Refresh: package metadata is refreshed from NuGet when the page loads. Limit: this is not a security, legal or compatibility guarantee; validate the selected version in your project.

Useful next steps

Move from package metadata to a concrete selection or review workflow.

ASP.NET Core package guide Audit NuGet dependencies in a .NET projectReview NuGet licenses before shipping