openapi

We (Speakeasy) recently open-sourced the OpenAPI library we use to generate SDKs and Terraform providers. We built this because we found existing Go libraries struggled with the "sharp edges" of OpenAPI—specifically dynamic types (polymorphic fields) and complex reference architectures (circular refs/remote files). This library uses Go generics to maintain strict type safety without losing flexibility and includes native support for the new Arazzo (workflows) and Overlay specifications. Code is here: https://github.com/speakeasy-api/openapi

At Speakeasy, we spend a lot of time working with OpenAPI specs, and we kept running into the same issues: existing parsers are either too rigid, incomplete, or don’t provide the foundations needed to build tools on top of OpenAPI. So we built our own: speakeasy-api/openapi. This is a fully open-source library for parsing, validating, and working with OpenAPI specifications. It’s written in Go and designed to be the foundation for SDK generators, documentation tooling, API gateways, and any other infra that needs to deeply understand OpenAPI. A few things we focused on: • Full Coverage: Handles the entire OpenAPI 3.1 spec (and 3.0.x). • Arazzo Support: Natively parses Arazzo, the new workflow-oriented extension for OpenAPI. • Overlays Support: First-class support for Overlays to make spec customization and composition easier. • Strict