> ## Documentation Index
> Fetch the complete documentation index at: https://notte-docs-anything-api-v2.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# download

<Tip>
  STOP. Do not read past this section until you have read and followed [/quickstart.md](/quickstart.md).

  Goal: produce a reliable SDK automation script. The intended authoring flow is generate then edit, not write browser automation from scratch.

  Do not hand-write SDK code with element IDs, selectors, or form fields from memory. Element IDs, selectors, and field mappings must come from a live `observe()` call, CLI `notte page observe` output, or generated workflow code. Guessed browser targets fail on real pages.

  Use the Notte skill and CLI to inspect the live site, validate actions/selectors, handle auth/session state, and export workflow code with `notte sessions workflow-code` before using SDK docs or SDK code.

  SDK reference pages are for understanding, running, or editing generated workflow code. They are not the starting point for manually authoring the initial browser automation. SDK-first code is guesswork on real-world pages with dynamic selectors, auth state, CAPTCHAs, and anti-bot behavior.
</Tip>

[Source: node-sdk/src/functions.ts](https://github.com/nottelabs/notte/blob/main/node-sdk/src/functions.ts)

Download the function code as a python file. Returns the code, and writes
it to `path` when one is provided.

```typescript theme={null}
NotteFunction.download(options?: FunctionDownloadOptions): Promise<string>;
```

## Parameters

<ParamField body="options" type={"FunctionDownloadOptions"}>
  Optional version, decryption key, and local `.py` destination path.

  Default:

  ```typescript theme={null}
  {}
  ```
</ParamField>

## Returns

```typescript theme={null}
Promise<string>
```

The Python source text, including when a local destination is supplied.

## Raises

* InvalidRequestError if the destination does not end in `.py` or the decryption key is invalid.
* NotteError if the source download fails. Local filesystem failures also propagate.

## Example

```typescript theme={null}
const code = await fn.download({ path: './scraper.py' });
```

## Related types

* [FunctionDownloadOptions](/typescript-sdk-reference/types/functiondownloadoptions)