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RxDB (short forReactiveDatabase) is alocal-first, NoSQL-database for JavaScript Applications like Websites, hybrid Apps, Electron-Apps, Progressive Web Apps, Deno andNode.js. Reactive means that you can not only query the current state, butsubscribe to all state changes like the result of a query or even a single field of a document. This is great for UI-basedrealtime 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 implementprotocol for realtimereplication with your existing infrastructure or one of the plugins forHTTP,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 increasescode reuse because you can use the same database code for different JavaScript environments by just switching out the storage settings.

Use thequickstart, read thedocumentation or explore theexample projects.

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

RxDB provides an easy to implement,battle-testedSync Engine forrealtime 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 withGraphQL,CouchDB,Websocket,WebRTC (P2P),Supabase,Firestore orNATS.

RxDB is based on astorage interface that enables you to swap out the underlying storage engine. This increasescode 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 ofLocalStorage,IndexedDB,OPFS,LokiJS,Dexie.js,in-memory,SQLite, in aWebWorker thread and even on top ofFoundationDB andDenoKV.

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

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.

npm install rxdb rxjs --save

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 databaseconstdb=awaitcreateRxDatabase({name:'heroesdb',// the name of the databasestorage:getRxStorageLocalstorage()});// add collectionsawaitdb.addCollections({heroes:{schema:mySchema}});// insert a documentawaitdb.heroes.insert({name:'Bob',healthpoints:100});

constaliveHeroes=awaitdb.heroes.find({selector:{healthpoints:{$gt:0}}}).exec();// the exec() returns the result once

awaitdb.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 now byreading the docs or exploring theexample-projects.

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