LokiJS is an in-memory database that prioritizes performance and simplicity. It is written in JavaScript and can be used in web browsers, Node.js, and Cordova/PhoneGap applications. It offers a powerful query system and supports indexing for fast lookups.
In-memory database
LokiJS allows you to create an in-memory database, add collections, and insert documents.
const loki = require('lokijs');
const db = new loki('example.db');
const users = db.addCollection('users');
users.insert({ name: 'Odin', age: 1000 });
users.insert({ name: 'Thor', age: 30 });Powerful query system
You can query the database using a MongoDB-like query syntax to retrieve data based on complex criteria.
const elderlyGods = users.find({ age: { '$gt': 500 } });Indexing for fast lookups
LokiJS supports indexing of collections to enable faster query response times, especially beneficial for large datasets.
users.ensureIndex('age');
const youngGods = users.find({ age: { '$lte': 100 } });Persistence adapters
LokiJS can be configured to use various persistence adapters, allowing you to save the database state to a file, local storage, or other storage systems.
const lokiFsAdapter = require('lokijs/src/loki-fs-structured-adapter');
const adapter = new lokiFsAdapter();
const db = new loki('example.db', { adapter: adapter });Changes API
The Changes API allows you to listen for changes in the database, which can be used for syncing with a remote database or triggering other actions.
db.on('changes', function(changes) {
console.log('Database changes:', changes);
});
users.insert({ name: 'Loki', age: 1042 });NeDB is another lightweight JavaScript database, similar to LokiJS, that works both in Node.js and the browser. It also offers in-memory storage and has a MongoDB-like API. However, NeDB is no longer actively maintained.
PouchDB is a database that runs in the browser or in Node.js and is designed to sync with CouchDB. It offers similar query capabilities to LokiJS but focuses more on synchronization and offline-first applications.
RxDB is a reactive database for JavaScript applications, which can be used in browsers, Node.js, and hybrid apps. It is built on top of PouchDB and offers real-time synchronization and event-driven data flows, which is different from LokiJS's approach.
LowDB is a small local JSON database powered by Lodash, suitable for small projects (Node, Electron, and the browser). It is simpler than LokiJS and does not offer in-memory storage, but it is easy to use for small datasets and simple applications.
LokiJS is a document oriented database written in javascript. Its purpose is to store javascript objects as documents in a nosql fashion and retrieve them with a similar mechanism. Runs in node (including cordova/phonegap and node-webkit) and the browser. LokiJS is ideal for the following scenarios:
LokiJS supports indexing and views and achieves high-performance through maintaining a binary-index for data.
example usage here
LokiJS is at version 1.1 [Wintar]. While the roadmap is exciting, LokiJS is at the moment stable. As LokiJS is written in Javascript it can be run on any environment supporting javascript such as browsers, node.js/node-webkit, hybrid mobile apps (such as phonegap/cordova), or the jvm through engines such as rhino.
Made by @techfort, with the precious help of Dave Easterday. Leave a tip or give us a star if you find LokiJS useful!
For browser environments you simply need the lokijs.js file contained in src/
You can use bower to install lokijs with bower install lokijs
For node environments you can install through npm install lokijs.
For help / enquiries contact joe.minichino@gmail.com
Copyright (c) 2015, Joe Minichino joe.minichino@gmail.com All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
THIS SOFTWARE IS PROVIDED BY ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
FAQs
Fast document oriented javascript in-memory database
We found that lokijs demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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