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---
name: Hot reload an HTTP server
---
Bun supports the [`--hot`](/docs/runtime/hot#hot-mode) flag to run a file with hot reloading enabled. When any module or file changes, Bun re-runs the file.
```sh
bun --hot run index.ts
```
---
Bun detects when you are running an HTTP server with `Bun.serve()`. It reloads your fetch handler when source files change, _without_ restarting the `bun` process. This makes hot reloads nearly instantaneous.
```ts
Bun.serve({
port: 3000,
fetch(req) {
return new Response(`Hello world`);
},
});
```
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