Trying to store a unique ID from Firebase

Hi all,

I’m using a Firebase realtime database in my app. Using fetch I can GET and POST new items to the database.

The problem I have is trying to access or store the unique ID for each entry. I need that unique ID to append the database URL so I can edit a specific entry. Any advice or resources on how to do this would be much appreciated!
Here’s what I have at the moment:

Database Structure
{
   "-KbRJK2tHQSfvoHD400o" :{
       "description": "A description ",
       "title":"A name"
   },
   "-KbRJQi7ntTTTGBSZSVX" :{
      "description":"Another description",
      "title":"Another name"
   }
}
Getting the data
var Observable = require("FuseJS/Observable");
var Timer = require('FuseJS/Timer');

var activities = Observable();
var errorMessage = Observable();

var timer = Timer.create(function() {
    load();
}, 100, true);


function load() {
    fetch('https://[myDatabase].firebaseio.com/.json?auth=[mySecret]', {
            method: 'GET',
            cache: 'default',
            headers: {
                "Content-type": "application/json"
            }
        })
        .then(function(result) {
            if (result.status !== 200) {
                console.log("Something went wrong :(");
                return;
            }
            return result.json();
        })

        .then(function(data) {
            var keys = Object.keys(data);
                keys.forEach(function(key, index) {
                  if (index >= activities.length) {
                     var value = data[key];
                     activities.add(value);
                   }
                })
               });
};

module.exports = {
    activities: activities,
	errorMessage: errorMessage
};
Posting data
var Observable = require("FuseJS/Observable");

var title = Observable();
var description = Observable();

function submit() {
    fetch('https://[myDatabase].firebaseio.com/.json?auth=[mySecret]', {
        method: 'POST',
        headers: {
            "Content-type": "application/json"
        },
        body: JSON.stringify({
            "title": title.value,
            "description": description.value
        }),
    });
}

module.exports = {
    title: title,
    description: description,
    submit: submit
}