Swagger Codegen is a template-driven engine and multi-language toolkit used to generate API client SDKs, server stubs, and human-readable documentation from OpenAPI specifications. It translates these specifications into functional libraries and boilerplate routing code across various target programming languages.
The tool utilizes a pluggable generator module system and an integrated template engine, allowing for the customization of generated source code and the creation of new language-specific generators. It supports flexible specification sourcing via local files, remote HTTP endpoints, or a hosted web application.
The project covers a broad range of automation capabilities, including integration with build tools and CI/CD pipelines, containerized CLI execution, and configurable type mapping. It also provides features for artifact filtering, external model mapping to prevent duplicate definitions, and the ability to deploy generated SDKs directly to GitHub.