Enterprise architecture for every JavaScript runtime.

Core principles

• Plugin-first

  Every capability is a plugin; the kernel ships with zero features.

• Runtime independent

  Node.js, Deno, Bun, and Cloudflare Workers — business logic never touches runtime APIs.

• Optional DI & decorators

  Dependency injection and decorators are plugins, not requirements. Everything has a programmatic API.

• Type safe

  Strict TypeScript throughout; no any in public APIs; tree-shakeable ES modules.

Capabilities

52 published packages — common, kernel, runtime, exceptions, 41 plugins, three starters, the SDK, test utilities, the setu CLI and its create launcher. Add only what you use; heavy dependencies are injected or lazily loaded, never installed by default.

Browse every package · Runnable examples

• Core

  Plugin kernel, middleware pipeline, Hono routing, runtime abstraction, RFC 9457 exceptions, test utilities.

• Request path

  Logging, configuration, validation, security headers/CSRF, JWT & API-key auth with RBAC, GraphQL over HTTP.

• Data

  Repositories over memory, Prisma, Drizzle, MongoDB, DynamoDB, Cosmos DB, Bigtable, D1; caching; storage; multi-tenancy.

• Messaging & background

  Domain events, CQRS, seven message brokers, queues & cron scheduling, CPU-bound worker pools.

• Service-to-service

  Service discovery (Consul, Kubernetes, DNS), gRPC/Connect co-serving, Cloudflare bindings, static files.

• Real-time & rendering

  SSE, WebSocket rooms, cross-replica backplane, React Router SSR, server-rendered views.

• Operations

  Health probes, Prometheus metrics, OpenTelemetry tracing, OpenAPI 3.1, audit trail, resilience patterns, secrets.

• Delivery & ergonomics

  Mail, notifications, feature flags, optional DI and decorators, the setu CLI, client SDK, starter bundles.

Quick example

The smallest possible application — just the kernel and a runtime:

1import { createApplication } from '@setu-ts/kernel';
2import { RuntimePlugin } from '@setu-ts/runtime';
3import { LoggerPlugin } from '@setu-ts/logger-plugin';
4
5const app = createApplication({
6  plugins: [RuntimePlugin(), LoggerPlugin({ level: 'info' })],
7});
8
9app.router.get('/', (ctx) => {
10  return ctx.response.json({ message: 'Hello, World!' });
11});
12
13await app.start({ port: 3000 });

No decorators. No DI. No modules. Add capabilities as you need them — see Getting started and the plugin catalog.