ZangoDB

ZangoDB (v1.0.8) provides a MongoDB-like query interface over HTML5 IndexedDB in the browser. It supports most MongoDB filter operators ($and, $or, $regex, $elemMatch), update operators ($set, $unset, $inc), aggregation pipeline stages ($match, $project, $group, $unwind, $sort), and group operators ($sum, $avg). Unlike other IndexedDB wrappers, ZangoDB offers a full query language with projection and aggregation, similar to Minimongo but more actively maintained. It is designed for browser use and requires an IndexedDB implementation (native or polyfill). Release cadence is low; the version 1.0.8 has been stable with no recent updates. It ships TypeScript definitions.