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A powerful OpenAPI v3.1 compliant REST framework for Node.js with comprehensive MongoDB support, JSON Schema validation, OAuth2 authentication, and CASL authorization. Current stable version 15.0.2 (released Jan 2025) aligns with MongoDB 7.x via bson 7.x. Key differentiators: automatic OpenAPI spec generation, built-in MongoDB CRUD operations, RQL querying, and JSON Patch support. Release cadence is major versions every 12–18 months. ESM-only with Node.js >=20 required; includes full TypeScript definitions. Integrates with Express.js and supports JSON-RPC endpoints.