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

fetch('https://api.browser-use.com/api/v2/sessions/{session_id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "detail": "Session not found"
}