Beta is live
Ilha is a tiny, isomorphic web UI library built around the islands architecture — ship minimal JavaScript, hydrate only what matters.
- Universal rendering — SSR, static generation, hybrid, and edge rendering out of the box
- Fine-grained reactivity — signal-based state with no virtual DOM and no compiler required
- Flexible scope — progressively enhance server-rendered HTML, or build fully self-contained apps
- SSR + hydration — render on the server, restore state on the client with zero flicker
- File-system routing — optional Vite plugin for automatic, convention-based routing
- Shared global state —
@ilha/storefor cross-island state on the same signal engine as the core - Backend agnostic — integrates with any backend; first-class Nitro and Hono support
- Prompt-sized source — small enough to fit the entire codebase into an AI context window
- Type-safe by default — first-class TypeScript support throughout
npm install ilha
# or with Bun
bun add ilhaScaffold a project in seconds with one of the official starters:
| Template | Command | Sandbox |
|---|---|---|
| Vite | npx giget@latest gh:ilhajs/ilha/templates/vite |
Open |
| Hono | npx giget@latest gh:ilhajs/ilha/templates/hono |
Open |
| Nitro | npx giget@latest gh:ilhajs/ilha/templates/nitro |
Open |
| Elysia | npx giget@latest gh:ilhajs/ilha/templates/elysia |
Place a mount point anywhere in your HTML:
<body>
<div data-ilha="Counter"></div>
</body>Define your island and mount it:
import ilha, { html, mount } from "ilha";
const Counter = ilha
.state("count", 0)
.on("[data-action=increase]@click", ({ state }) => state.count(state.count() + 1))
.on("[data-action=decrease]@click", ({ state }) => state.count(state.count() - 1))
.render(
({ state }) => html`
<p>Count: ${state.count()}</p>
<button data-action="increase">Increase</button>
<button data-action="decrease">Decrease</button>
`,
);
mount({ Counter });mount() auto-discovers every [data-ilha] element on the page and activates the matching island.
This monorepo contains the following packages:
| Package | Description |
|---|---|
ilha |
Core island builder — state, events, SSR rendering, and DOM hydration |
@ilha/router |
Isomorphic SPA router with SSR support and a Vite file-system routing plugin |
@ilha/store |
Zustand-shaped global store backed by alien-signals — share state across islands |
Have questions or want to share what you're building? Join our Discord to connect with other Ilha developers.
Made with contrib.rocks.
MIT