Dan Guisinger

As serverless applications grow, APIs rarely live in a single project for long.

Teams break functionality into focused Lambda Annotation projects, deploy them independently, and often place them behind a single API Gateway. The architecture scales beautifully—but documentation doesn’t always keep up.

With LambdaOpenApi 1.1.0, we’re introducing a new capability designed specifically for this reality: the OpenAPI Schema Merge Tool.

We’re excited to announce the official v1.0 release of LambdaOpenApi — now available on NuGet!

LambdaOpenApi grew out of an internal tool we built to support our own production AWS Lambda applications. After using it successfully in real workloads, we refined it, generalized it, and open-sourced it so the broader .NET and Lambda community can benefit from the same streamlined OpenAPI workflow.