Keystone is a GraphQL headless content management system and Node.js backend framework. It functions as a schema-driven data manager that automatically generates a GraphQL API and a React administrative dashboard based on a central data model configuration.
The system uses an adapter-based database abstraction to decouple core logic from storage layers and a storage-provider abstraction for managing media assets via local or cloud drivers. It distinguishes itself through a component-based field rendering system and a hook-based middleware pipeline for data validation and automation.
The framework covers a broad range of capabilities including role-based access control, user authentication, and the management of complex relational data models. It allows for system extension through a plugin-based architecture, custom GraphQL resolvers, and a customizable management interface.