dotnet-openapi
dotnet-openapi
OpenAPI/Swagger integration for ASP.NET Core. Microsoft.AspNetCore.OpenApi is the recommended first-party approach for .NET 9+ and is the default in new project templates. Swashbuckle is no longer actively maintained; existing projects using Swashbuckle should plan migration. NSwag remains an alternative for client generation and advanced scenarios.
Out of scope: Minimal API endpoint patterns (route groups, filters, TypedResults) -- see [skill:dotnet-minimal-apis]. API versioning strategies -- see [skill:dotnet-api-versioning]. Authentication and authorization -- see [skill:dotnet-api-security].
Cross-references: [skill:dotnet-minimal-apis] for endpoint patterns that generate OpenAPI metadata, [skill:dotnet-api-versioning] for versioned OpenAPI documents.
Microsoft.AspNetCore.OpenApi (Recommended)
Microsoft.AspNetCore.OpenApi is the first-party OpenAPI package for ASP.NET Core 9+ and is included by default in new project templates. .NET 10 adds OpenAPI 3.1 support with JSON Schema draft 2020-12 compliance.
Basic Setup
// Microsoft.AspNetCore.OpenApi -- included by default in .NET 9+ project templates
// If not present, add: <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.*" />
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