contract-first-openapi-generator

Contract-first API development uses an OpenAPI specification as the single source of truth before writing any code. You need it when starting new microservices to prevent inconsistencies and ensure compatibility between services from the beginning.

You generate server stubs from an OpenAPI specification by providing the definition file as input. The system validates schema completeness and backward compatibility before scaffolding the server and client stubs for your service.

Yes, you can generate both server and client stubs from the same OpenAPI contract. This ensures immediate alignment between the service implementation and the client libraries consuming the API.

Yes, contract-first scaffolding requires validation of schema completeness and backward compatibility before generating any code. This prevents breaking changes and ensures your API versions remain compatible.

Using an OpenAPI specification as the source of truth prevents inconsistencies between services by enforcing a defined contract. Code-first approaches risk misalignment, whereas contract-first scaffolding guarantees both server and client match the specification.

The limitation of OpenAPI contract scaffolding is that it requires complete schema definitions upfront. You cannot generate stubs if the specification lacks completeness or fails backward compatibility validation checks.