Bun's package manager can install any publicly available tarball URL as a dependency of your project.

bun add zod@https://registry.npmjs.org/zod/-/zod-3.21.4.tgz

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Running this command will download, extract, and install the tarball to your project's node_modules directory. It will also add the following line to your package.json:

{
  "dependencies": {
    "zod": "https://registry.npmjs.org/zod/-/zod-3.21.4.tgz"
  }
}

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The package "zod" can now be imported as usual.

import { z } from "zod";

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See Docs > Package manager for complete documentation of Bun's package manager.