Grape is a RESTful web service framework for Ruby designed for building structured APIs. It provides a declarative syntax for routing and parameter validation, allowing developers to map HTTP verbs to logic through a domain specific language.
The framework is distinguished by its built-in support for service versioning, which can be managed via URL paths, custom headers, or request parameters. It also features a modular architecture that allows large services to be constructed by nesting smaller API definitions.
The project covers comprehensive API lifecycle capabilities, including schema-driven input validation, type coercion, and content negotiation for various media types. It utilizes a middleware-based request pipeline for injecting custom logic and offers tools for entity-based response formatting and automated specification generation.
The framework includes built-in mechanisms for request authentication and standardized error response mapping.
