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32 lines
703 B
Markdown
32 lines
703 B
Markdown
---
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name: Read stderr from a child process
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---
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When using [`Bun.spawn()`](https://bun.com/docs/api/spawn), the child process inherits the `stderr` of the spawning process. If instead you'd prefer to read and handle `stderr`, set the `stderr` option to `"pipe"`.
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```ts
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const proc = Bun.spawn(["echo", "hello"], {
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stderr: "pipe",
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});
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proc.stderr; // => ReadableStream
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```
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---
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To read `stderr` until the child process exits, use .text()
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```ts
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const proc = Bun.spawn(["echo", "hello"], {
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stderr: "pipe",
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});
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const errors: string = await proc.stderr.text();
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if (errors) {
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// handle errors
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}
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```
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---
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See [Docs > API > Child processes](https://bun.com/docs/api/spawn) for complete documentation.
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