OpenApiWeaverBuild-time OpenAPI to C# Client Generation

Incremental Roslyn source generation for strongly typed C# HTTP clients from OpenAPI 3.x documents, including OpenAPI 3.2.

Get Started

View on GitHub

Zero Runtime Overhead

Generates all client code at compile time through Roslyn source generators, without runtime code generation, reflection, or additional runtime dependencies.

Incremental & Fast

Uses the Roslyn incremental generator pipeline so only changed documents are reprocessed, which keeps rebuilds efficient even in large solutions.

NuGet Package Distribution

Ships as a single NuGet package that includes the source generator and required analyzer assemblies, without separate CLI tools or additional MSBuild steps.

Strongly Typed with IntelliSense

Provides IntelliSense, compile-time type safety, and navigation support for generated clients, operations, and DTOs.

JSON & YAML

Reads OpenAPI 3.0-3.2 documents in JSON (.json) and YAML (.yaml, .yml) formats.

Build-Time Diagnostics

Reports invalid or unsupported OpenAPI documents as standard compiler warnings and errors.