extract-openapi-from-code

Generating an OpenAPI spec from FastAPI or NestJS code is done by automatically extracting route definitions and schemas from the codebase. This Skill parses frameworks like FastAPI, NestJS, and Spring Boot to output machine-readable JSON or YAML API specifications.

Extracting OpenAPI specifications from Flask and Django projects is fully supported. The Skill analyzes Python, Node.js, Java, Ruby, and PHP codebases to convert existing API definitions into standardized OpenAPI documentation formats.

Automating API documentation from a Spring Boot codebase is achieved by extracting OpenAPI specs directly from the source code. This eliminates manual spec writing and ensures your documentation stays perfectly consistent with your code definitions.

OpenAPI extraction supports Hono, Rails, and Laravel frameworks alongside others like FastAPI and Flask. It processes these codebases to generate API specifications, which can then be linted and refined using overlays.

Validating and refining an OpenAPI spec after extraction involves linting the generated file and applying overlays. This process corrects errors and can inject Speakeasy extensions to prepare the specification for client SDK generation.

Using the extracted OpenAPI spec to generate client SDKs is a primary use case. After extracting and validating the specification, you can pass it to Speakeasy for automated multi-language SDK generation.