How to send Firebase Cloud Messaging from a node server?

Question

Is there any way to send notifications from FCM from a node.js server?

I haven't found anything about it inside documentation.

Answer 1

Sending messages through Firebase Cloud Messaging takes calling an HTTP end point as described in the documentation on sending downstream messages.

Something as simple as this could do the trick:

var request = require('request');

function sendMessageToUser(deviceId, message) {
  request({
    url: 'https://fcm.googleapis.com/fcm/send',
    method: 'POST',
    headers: {
      'Content-Type' :' application/json',
      'Authorization': 'key=AI...8o'
    },
    body: JSON.stringify(
      { "data": {
        "message": message
      },
        "to" : deviceId
      }
    )
  }, function(error, response, body) {
    if (error) { 
      console.error(error, response, body); 
    }
    else if (response.statusCode >= 400) { 
      console.error('HTTP Error: '+response.statusCode+' - '+response.statusMessage+'\n'+body); 
    }
    else {
      console.log('Done!')
    }
  });

sendMessageToUser(
  "d7x...KJQ",
  { message: 'Hello puf'}
);

Update (April 2017): you can now also run code very similar to this in Cloud Functions for Firebase. See https://firebase.google.com/docs/functions/use-cases#notify_users_when_something_interesting_happens