rxdb

A fast, local-first, reactive Database for JavaScript Applications

       

     

  What is RxDB?

RxDB (short for Reactive Database) is a local-first, NoSQL-database for JavaScript Applications like Websites, hybrid Apps, Electron-Apps, Progressive Web Apps, Deno and Node.js. Reactive means that you can not only query the current state, but subscribe to all state changes like the result of a query or even a single field of a document. This is great for UI-based realtime applications in a way that makes it easy to develop and also has great performance benefits but can also be used to create fast backends in Node.js.
RxDB provides an easy to implement protocol for realtime replication with your existing infrastructure or one of the plugins for HTTP, GraphQL, CouchDB, Websocket, WebRTC, Supabase, Firestore, NATS.
RxDB is based on a storage interface that enables you to swap out the underlying storage engine. This increases code reuse because you can use the same database code for different JavaScript environments by just switching out the storage settings.

Use the quickstart, read the documentation or explore the example projects.

  Used by many

RxDB is a proven technology used by thousands of developers worldwide. With its flexibility, RxDB is used in a diverse range of apps and services.

(add yours)

  Multiplayer realtime applications

  Replicate with your existing infrastructure

RxDB provides an easy to implement, battle-tested Sync Engine for realtime replication with your existing infrastructure.
You do not have to use a specific cloud or backend database. The protocol works by implementing three simple HTTP endpoints. There are also production-ready plugins to easily replicate with GraphQL, CouchDB, Websocket, WebRTC (P2P),Supabase, Firestore or NATS.

  Flexible storage layer

RxDB is based on a storage interface that enables you to swap out the underlying storage engine. This increases code reuse because the same database code can be used in different JavaScript environments by just switching out the storage settings.

You can use RxDB on top of LocalStorage, IndexedDB, OPFS, LokiJS, Dexie.js, in-memory, SQLite, in a WebWorker thread and even on top of FoundationDB and DenoKV.

No matter what kind of runtime you have, as long as it runs JavaScript, it can run RxDB:

Browsers Node.js React Native Capacitor NativeScript Flutter or as an Electron Database

All the features that you need

Since its beginning in 2018, RxDB has gained a huge set of features and plugins which makes it a flexible full solution regardless of which type of application you are building. Every feature that you need now or might need in the future is already there.

Logging Attachments ORM Conflict Handling Middleware Signals

State Backup Replication Server Storages Local Documents

Schema Validation Compression Migration Encryption CRDT Population

  Quick start

Install

npm install rxdb rxjs --save

Store data

import { 
  createRxDatabase
} from 'rxdb/plugins/core';

/**
 * For browsers, we use the localstorage based storage.
 * In other JavaScript runtimes, we can use different storages:
 * @link https://rxdb.info/rx-storage.html
 */
import { getRxStorageLocalstorage } from 'rxdb/plugins/storage-localstorage';

// create a database
const db = await createRxDatabase({
    name: 'heroesdb', // the name of the database
    storage: getRxStorageLocalstorage()
});

// add collections
await db.addCollections({
  heroes: {
    schema: mySchema
  }
});

// insert a document
await db.heroes.insert({
  name: 'Bob',
  healthpoints: 100
});

Query data once

const aliveHeroes = await db.heroes.find({
  selector: {
    healthpoints: {
      $gt: 0
    }
  }
}).exec(); // the exec() returns the result once

Observe a Query

await db.heroes.find({
  selector: {
    healthpoints: {
      $gt: 0
    }
  }
})
.$ // the $ returns an observable that emits each time the result set of the query changes
.subscribe(aliveHeroes => console.dir(aliveHeroes));

  Get started

Get started now by reading the docs or exploring the example-projects.

  Support and Contribute

• Leave a Star ☝️
• Check out how you can contribute to this project.
• Read this when you have found a bug
• Buy access to the premium plugins
• Join us at discord to get help
• Follow us at LinkedIn

More content

Angular Database, Frontend Database, localStorage, React Database, Browser Database, React Native Database, PWA Database, In-memory NoSQL database, JSON database, Angular IndexedDB, React IndexedDB, Optimistic UI, local database, React Native Encryption, Vue Database, jQuery Database, Vue IndexedDB, Firestore Alternative, Firebase Realtime Database Alternative, Ionic Storage

Changelog

16.13.0 (30 May 2025)

• FIX queue start/stop/cancel operations in the replication state to ensure operations do not intersect and cause errors.
• FIX real-time query ignoring the latest changes after deleting and purging data #7187
• ADD putAttachmentBase64() and getDataBase64() to the attachments API so that attachments can be stored and read in runtimes that do not support Blob.
• FIX schema migration failing when returning null #7204