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

# viewer

<Tip>
  Read [the Notte skill](https://notte.cc/skill.md) and follow its setup instructions when setting up Notte or building browser automation. This is the shared source for CLI setup, authentication, and the browser-to-code workflow.
</Tip>

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

Open the live viewer for this session in the local default browser.

```typescript theme={null}
Session.viewer(): void;
```

## Returns

```typescript theme={null}
void
```

## Raises

* If the session has not started or no viewer URL is available.


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