LokiJS: In-Memory Document Database

LokiJS is a fast, embeddable, document-oriented NoSQL database written entirely in JavaScript. It operates in-memory, making it suitable for performance-critical applications like client-side session stores, embedded databases in Electron or Node-WebKit apps, or mobile applications using frameworks like Nativescript and Cordova. It features collections with unique and binary indexes, dynamic views, a Changes API for synchronization, and supports joins. Persistence is handled through a pluggable adapter system, with built-in adapters for Node.js file system, browser IndexedDB, and localStorage. While the last published version on npm is 1.5.12 (last updated around 2019-2020), the project has seen minimal activity and is largely considered unmaintained, with its official successor being LokiDB. Users should be aware of its unmaintained status and consider the successor or other alternatives for new projects.