RxDB is a NoSQL database for JavaScript that runs directly in your app. With a local-first design, it delivers zero-latency queries even offline, and syncs seamlessly with any backend.
RxDB's easy-to-use Sync Engine powers realtime synchronization between clients and servers. Either use one of our prebuild replication plugins...
OR
...sync with your custom server by implementing only three simple endpoints.
RxDB adopts the local-first approach by storing data locally on the client and managing continuous synchronization. You can even run your app entirely without a backend.
RxDB uses JSON Schema, a format widely recognized by developers through tools like OpenAPI or Swagger. Because JSON Schema is so well-established, it integrates seamlessly with existing validators, editors, and development tooling, making schema design both simple and highly flexible.
A minimal RxDB schema might define fields, data types, and indexes in a fully declarative way. For example:
const heroSchema = {
title: 'hero schema',
version: 0,
primaryKey: 'id',
type: 'object',
properties: {
id: {
type: 'string',
maxLength: 100
},
name: {
type: 'string'
},
power: {
type: 'string'
},
age: {
type: 'number'
}
},
required: ['id', 'name']
};