lifx-breathe.js

// https://api.developer.lifx.com/docs/breathe-effect

(async () => {
  const token = prompt('Token?');

  const selector = 'all';
  const url = `https://api.lifx.com/v1/lights/${selector}/effects/breathe`;
  const params = {
    color: 'red',
    cycles: 3,
  }
  
  try {
    const res = await fetch(url, {
      method: 'POST',
      headers: {
        Authorization: `Bearer ${token}`,
      },
      body: new URLSearchParams(params)
    });
    console.log(res.status, res.statusText);
    if (res.ok) {
      const body = await res.json();
      console.log(body);
    }
    else {
      console.error('Failed');
    }
  }
  catch (error) {
    console.error(error);
  }
})();