29 lines
724 B
Plaintext
29 lines
724 B
Plaintext
---
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title: Hot reload an HTTP server
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sidebarTitle: Hot reload an HTTP server
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mode: center
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---
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The [`--hot`](/runtime/watch-mode#hot-mode) flag runs a file with hot reloading enabled. When any module or file changes, Bun re-runs the file.
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```sh terminal icon="terminal"
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bun --hot run index.ts
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```
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---
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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.
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<Note>
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Hot reloading doesn't reload the page in your browser.
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</Note>
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```ts index.ts icon="/icons/typescript.svg"
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Bun.serve({
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port: 3000,
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fetch(req) {
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return new Response("Hello world");
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},
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});
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```
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