OpenAPI Mocker

OpenAPI Mocker is a robust mock server designed to generate API responses based on an OpenAPI 3.x specification (both YAML and JSON formats). It provides a quick way for developers to establish a local mock API, primarily through a command-line interface (CLI) or Docker container, but also offers a programmatic API. The current stable version, 2.0.0, represents a significant rewrite in TypeScript, enhancing maintainability and type safety. Key capabilities include comprehensive request parameter and body validation, dynamic response generation derived from schema examples, flexible response selection via `Prefer` HTTP headers (e.g., `statusCode=XXX`, `example=name`), and advanced data customization through `x-faker` and `x-count` extensions for generating realistic, randomized data. Its primary differentiator is the rich support for OpenAPI 3.0 features and custom extensions, making it ideal for rapid API prototyping, frontend development, and testing in environments where a backend is not yet available or stable.