Microsoft.AspNetCore.OpenApi

v9.0.18

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/a95d6599f37762ec8394ba9ca01e8263b2e36a26

aspnet dotnetframework Microsoft

aspnetcore openapi

NuGet Stats Changelog

Total Downloads

221.1M

221,148,804

Published

Jul 14, 2026

Latest stable version

Install

.NET CLI

dotnet add package Microsoft.AspNetCore.OpenApi --version 9.0.18

Package Manager Console

Install-Package Microsoft.AspNetCore.OpenApi -Version 9.0.18

PackageReference

<PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.18" />

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 project Review NuGet licenses before shipping