jski

A JSON Schema validator supporting a subset of JSON Schema v4 (draft 4). Version 0.6.1 is the latest stable release. It allows building schemas via method chaining or from plain JSON objects, and provides validation with detailed error objects. Key differentiators: lightweight, no dependencies, simple API. However, it has significant limitations: no union types, limited array/object additionalItems/Properties, no patternProperties, no dependencies, no $ref resolution beyond definitions, and no 'not' support. It is currently in maintenance mode with no recent updates.