const response = await fetch(
  'https://instagres.com/api/v1/database',
  {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ ref: 'my-app' })
  }
);

const {
  connString,
  claim_url,
  expires_at
} = await response.json();