mingo

MongoDB query language for in-memory JavaScript objects. v7.2.1 (stable, actively maintained). Supports query, projection, aggregation pipeline (including accumulators, expressions, window operators, variables like $$ROOT), and update operations. Key differentiator: brings MongoDB Query Language (MQL) to client-side or server-side JS without a database, with lazy data processing, custom equality, and TypeScript types. Updated frequently with MongoDB operator parity.