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

# Execute Code Snippet

> Run a TypeScript snippet inside an existing browser session

The execute-code tool runs a TypeScript snippet inside an existing browser session, letting you perform custom browser logic without managing your own automation infrastructure.

<Note> Code Execution is available from the [Growth tier](https://app.anchorbrowser.io/billing) and above. </Note>

Create a session with `POST /v1/sessions`, then call `POST /v1/tools/execute-code` with `sessionId` in the query string. The request body `code` field is an async function body with injected `page`, `browser`, `context`, `sessionId`, and `anchorClient`. On success, the API returns `output` as a JSON string of your return value.

See the full [API reference](/api-reference/tools/execute-code-snippet) for details.

### Code example

<CodeGroup>
  ```javascript node.js theme={null}
  const apiKey = process.env.ANCHOR_API_KEY;

  async function createSession() {
    const res = await fetch('https://api.anchorbrowser.io/v1/sessions', {
      method: 'POST',
      headers: {
        'anchor-api-key': apiKey,
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({}),
    });
    const json = await res.json();
    if (!res.ok) {
      throw new Error(`create session failed: ${res.status} ${JSON.stringify(json)}`);
    }
    return json.data.id;
  }

  const sessionId = await createSession();
  console.log('session', sessionId);

  const res = await fetch(`https://api.anchorbrowser.io/v1/tools/execute-code?sessionId=${sessionId}`, {
    method: 'POST',
    headers: {
      'anchor-api-key': apiKey,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      code: "await page.goto('https://news.ycombinator.com'); const title = await page.title(); return { title };",
    }),
  });
  const body = await res.json();
  console.log(body);
  ```
</CodeGroup>