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lokijs

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lokijs

Fast document oriented javascript in-memory database


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767K
decreased by-4.78%
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What is lokijs?

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.

What are lokijs's main functionalities?

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 });

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Package last updated on 20 Apr 2021

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