const options = {method: 'GET', headers: {'X-Browser-Use-API-Key': '<api-key>'}};

fetch('https://api.browser-use.com/api/v3/workspaces/{workspace_id}/size', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>"
    }
  ]
}