# Backends & REST APIs
## Example generated code
src/index.ts:
```ts
import { Hono } from "hono";
const app = new Hono();
// Serve the application's frontend.
app.get("/", (c) => {
return c.html(`
Hello from Dynamic Apps
Hello from Dynamic Apps
This HTML is served by an HTTP app running inside agentOS.
Call the JSON API
`);
});
// Serve a REST API request from the same application.
app.get("/api/hello", (c) => {
return c.json({ message: "Hello from Dynamic Apps" });
});
export default app;
```
package.json:
```json
{
"name": "hello-world-app",
"version": "0.0.0",
"private": true,
"main": "src/index.ts",
"dependencies": {
"hono": "4.13.5"
}
}
```
## Deploy and route
Deploy the directory and every route the app defines is served under
`/apps/:appId` on your routing server:
src/server.ts:
```ts
import { serve } from "@hono/node-server";
import { appsRouter } from "@rivet-dev/dynamic-apps";
import { Hono } from "hono";
const server = new Hono();
// This is how the Rivet control plane communicates with your backend.
server.all("/api/rivet/*", (c) => appsRouter.fetch(c.req.raw));
// Mount every deployed application at /apps/:appId.
server.route("/apps", appsRouter);
// Serve the host router over HTTP.
serve({
fetch: server.fetch,
port: 3000,
});
```
See [Route](/dynamic-apps/docs/routing) for how requests reach the app and
[Deploy](/dynamic-apps/docs/deploy) for builds and releases.