Skip to content
delta-base docs

What is DeltaBase?

The serverless event store for TypeScript developers

A fully managed, serverless event store built on Cloudflare’s edge. TypeScript-native. Zero-config. Pay per event.

Event sourcing without the headache.

Why Developers Choose DeltaBase

Section titled “Why Developers Choose DeltaBase”

Zero-Config Local Development

Section titled “Zero-Config Local Development”
Terminal window
npx @delta-base/cli dev
# Local event store + Studio UI running in seconds

TypeScript-Native

Section titled “TypeScript-Native”

Built for modern JavaScript. Full type safety. Great IntelliSense. Not ported from Java.

Edge-First

Section titled “Edge-First”

Runs on Cloudflare’s global network. Low latency worldwide. Works with Vercel Edge, Cloudflare Workers, anywhere V8 runs.

Pay Per Event

Section titled “Pay Per Event”

No servers to provision. No monthly minimums. You pay for events read, written, and stored. Nothing else.

When to Use It

Section titled “When to Use It”

Great fit:

  • Audit trails and compliance (financial, healthcare, legal)
  • Time-travel debugging (“What happened last Tuesday?”)
  • Complex workflows with rollbacks
  • Real-time features and notifications
  • Multi-tenant SaaS applications

Skip it when:

  • Simple CRUD is enough (user profiles, settings)
  • Data rarely changes (static configuration)
  • Your team isn’t ready for event-driven thinking

We’re honest about this. Event sourcing is powerful, but it’s not always the right tool.

How It Works

Section titled “How It Works”

Three concepts. That’s it.

  1. Commands - Intent to change (money.deposit, order.place)
  2. Events - What happened (money.deposited, order.placed)
  3. State - Current reality, calculated from events
// Business logic decides what events to produce
const events = decide(command, currentState);


// Store the facts
await eventStore.appendToStream(streamId, events);


// Rebuild state anytime by replaying events
const state = events.reduce(evolve, initialState);

The Package Ecosystem

Section titled “The Package Ecosystem”

@delta-base/server — Event store client for Node.js and serverless functions

import { DeltaBase } from '@delta-base/server';


const client = new DeltaBase({ apiKey: process.env.DELTABASE_API_KEY });
const eventStore = client.getEventStore('my-app');

@delta-base/cli — Local development and deployment

Terminal window
npx @delta-base/cli dev    # Start local environment

@delta-base/toolkit — Command handlers, projections, and patterns

import { handleCommandWithDecider } from '@delta-base/toolkit';

What You Get

Section titled “What You Get”
  • Complete audit trails — Every change preserved forever
  • Time-travel debugging — Reproduce any bug, any state, any moment
  • Real-time subscriptions — WebSockets and webhooks built-in
  • Global performance — Edge deployment, low latency everywhere
  • Beautiful tooling — Studio UI for visualization and debugging

Start Building

Section titled “Start Building”

Send Your First Event →

Set Up Local Dev

Or jump straight to: