# HTTP Server

> Source: `src/content/docs/general/http-server.mdx`
> Canonical URL: https://rivet.dev/docs/general/http-server
> Description: Different ways to run your RivetKit HTTP server.

---
## Methods of Running Your Server

### registry.start()

The simplest way to run your server. Starts a local RivetKit server, serves static files from a `public` directory, and starts the actor runner:

```ts index.ts
import { actor, setup } from "rivetkit";

const myActor = actor({ state: {}, actions: {} });
const registry = setup({ use: { myActor } });

registry.start();
```

Run with `npx tsx --watch index.ts` (Node.js), `bun --watch index.ts` (Bun), or `deno run --allow-net --allow-read --allow-env --watch index.ts` (Deno). Clients connect to the Rivet Engine on `http://localhost:6420`.

### With Fetch Handlers

A [fetch handler](https://wintercg.org/) is a function that takes a `Request` and returns a `Response`. This is the standard pattern used by Cloudflare Workers, Deno Deploy, Bun, and other modern runtimes.

Use `registry.serve()` to get a fetch handler:

```ts server.ts
import { actor, setup } from "rivetkit";

const myActor = actor({ state: {}, actions: {} });
const registry = setup({ use: { myActor } });

export default registry.serve();
```

To integrate with a router like [Hono](https://hono.dev/) or [Elysia](https://elysiajs.com/), use `registry.handler()`:

### Hono

```ts server.ts
import { Hono } from "hono";
import { actor, setup } from "rivetkit";

const myActor = actor({ state: {}, actions: {} });
const registry = setup({ use: { myActor } });

const app = new Hono();
app.get("/health", (c) => c.text("OK"));
app.all("/api/rivet/*", (c) => registry.handler(c.req.raw));

export default app;
```

### Elysia

```ts server.ts
import { Elysia } from "elysia";
import { actor, setup } from "rivetkit";

const myActor = actor({ state: {}, actions: {} });
const registry = setup({ use: { myActor } });

const app = new Elysia()
  .get("/health", () => "OK")
  .all("/api/rivet/*", ({ request }) => registry.handler(request));

export default app;
```

Then run your server:

```bash Node.js
npx tsx --watch server.ts
```

```bash Bun
bun --watch server.ts
```

```bash Deno
deno run --allow-net --allow-read --allow-env --watch server.ts
```

### Explicit HTTP Server

If you need to explicitly start the HTTP server instead of using the fetch handler pattern:

### Node.js (Hono)

Using Hono with `@hono/node-server`:

```ts server.ts
import { Hono } from "hono";
import { serve } from "@hono/node-server";
import { actor, setup } from "rivetkit";

const myActor = actor({ state: {}, actions: {} });
const registry = setup({ use: { myActor } });

const app = new Hono();
app.all("/api/rivet/*", (c) => registry.handler(c.req.raw));

serve({ fetch: app.fetch, port: 3000 });
```

### Node.js (Adapter)

Using `@whatwg-node/server` to adapt the fetch handler to Node's HTTP server:

```ts server.ts @nocheck
import { actor, setup } from "rivetkit";
import { createServer } from "node:http";
import { createServerAdapter } from "@whatwg-node/server";

const myActor = actor({ state: {}, actions: {} });
const registry = setup({ use: { myActor } });

const handler = createServerAdapter(registry.serve().fetch);
const server = createServer(handler);
server.listen(3000);
```

### Bun

Using Bun's native server:

```ts server.ts @nocheck
import { actor, setup } from "rivetkit";

const myActor = actor({ state: {}, actions: {} });
const registry = setup({ use: { myActor } });

Bun.serve({
  port: 3000,
  fetch: (request: Request) => registry.handler(request),
});
```

### Deno

Using Deno's native server:

```ts server.ts @nocheck
import { actor, setup } from "rivetkit";

const myActor = actor({ state: {}, actions: {} });
const registry = setup({ use: { myActor } });

Deno.serve({ port: 3000 }, (request: Request) => registry.handler(request));
```

_Source doc path: /docs/general/http-server_
