# Vercel Sandbox 1.9.0

- Product: Vercel Sandbox (https://whatsnew.fyi/product/vercel-sandbox)
- Vendor: Vercel
- Date: 2026-03-20
- Version: 1.9.0
- Original notes: https://github.com/vercel/sandbox/releases/tag/%40vercel/sandbox%401.9.0
- Permalink: https://whatsnew.fyi/product/vercel-sandbox/releases/1.9.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Support for setting file permissions (mode) in the writeFiles API with an optional mode property on files

###### Minor Changes

-   Add support for setting file permissions (mode) in the `writeFiles` API. Files can now include an optional `mode` property to set permissions on the tarball, avoiding the need for a separate `chmod` command. ([#90](https://github.com/vercel/sandbox/pull/90))

    ```ts
    await sandbox.writeFiles([
      {
        path: "/usr/local/bin/myscript",
        content: Buffer.from("#!/bin/bash\necho hello"),
        mode: 0o755,
      },
    ]);
    ```