mirror of
https://github.com/oven-sh/bun
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41 lines
1021 B
Plaintext
41 lines
1021 B
Plaintext
---
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title: Error Handling
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description: Learn how to handle errors in Bun's development server
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---
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To activate development mode, set `development: true`.
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```ts title="server.ts" icon="/icons/typescript.svg"
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Bun.serve({
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development: true, // [!code ++]
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fetch(req) {
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throw new Error("woops!");
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},
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});
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```
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In development mode, Bun will surface errors in-browser with a built-in error page.
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<Frame></Frame>
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### `error` callback
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To handle server-side errors, implement an `error` handler. This function should return a `Response` to serve to the client when an error occurs. This response will supersede Bun's default error page in `development` mode.
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```ts
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Bun.serve({
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fetch(req) {
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throw new Error("woops!");
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},
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error(error) {
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return new Response(`<pre>${error}\n${error.stack}</pre>`, {
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headers: {
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"Content-Type": "text/html",
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},
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});
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},
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});
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```
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<Info>[Learn more about debugging in Bun](/runtime/debugger)</Info>
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