title: Can we send send data type other than string using node-gcm module?
body: <p>Can we use <a href="https://www.npmjs.com/package/node-gcm" rel="nofollow noreferrer">node-gcm</a> to send any data type other than <code>string</code> e.g - boolean, I read in their documentation but didn't find anything regarding that?</p>
  
  <p>Or is this the only functionality provided by FCM in <code>Android</code> ??</p>