Minimongo

Minimongo is a client-side, in-memory MongoDB clone designed for browser and Node.js environments, offering a MongoDB-like API for CRUD operations and query syntax. It supports various local storage backends including IndexedDB, WebSQL (legacy), LocalStorage, and a purely in-memory option, with an autoselection utility. Currently at version 7.1.1, the project aims for stable releases without a strict public cadence, evolving from a 2014 fork of Meteor.js's minimongo package to incorporate more geospatial queries and npm-friendliness. Its key differentiators include hybrid local/remote synchronization with conflict resolution using base documents, replication between database instances, and support for Extended JSON (EJSON). While it offers a substantial subset of MongoDB query features, it does not support the full aggregation pipeline or all operators.