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I'm able to query my users array with an e-mail address and return the user's account info:
users.orderByChild('email').equalTo(authData.user.email).once('value').then(function(snapshot) { console.log(snapshot.val()); console.log(snapshot.key); // 'users' console.log(snapshot.child('email').key); 'email' ... 
How do I get the key (-KiBBDaj4fBDRmSS3j0r). snapshot.key returns users. snapshot.child('email').key returns email. The key doesn't appear to be a child, i.e., it appears to be in between users and email.
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Firebase automatically creates API keys for your project when you do any of the following: Create a Firebase project > Browser key auto-created. Create a Firebase Apple App > iOS key auto-created. Create a Firebase Android App > Android key auto-created.
In the Firebase console, open Settings > Service Accounts. Click Generate New Private Key, then confirm by clicking Generate Key.
This chat application allows users to store the basic profile and contact list. The user profile would be located on a path such as Users/$uid. User is a node in it and will have a sort of primary key associated with an ID. So, we can access each one uniquely.
In Firebase Database everything is a node, that follows the pattern key: value. Firebase Database provides us with a simple way to generate unique keys. Unique keys create new items while uploading data to a previously stored key will update.
With Firebase database queries, you can selectively retrieve data based on various factors. To construct a query in your database, you start by specifying how you want your data to be ordered using one of the ordering functions: orderByChild(), orderByKey(), or orderByValue().
Note that select Java as the programming language. After creating a new project. Navigate to the Tools option on the top bar. Inside that click on Firebase. After clicking on Firebase, you can get to see the right column mentioned below in the screenshot.
Navigate to the Tools option on the top bar. Inside that click on Firebase. After clicking on Firebase, you can get to see the right column mentioned below in the screenshot. Inside that column Navigate to Firebase Realtime Database.
Asynchronous listeners: Data stored in a Firebase Realtime Database is retrieved by attaching an asynchronous listener to a database reference. The listener is triggered once for the initial state of the data and again anytime the data changes. An event listener may receive several different types of events.
You could do something like this:
var key = Object.keys(snapshot.val())[0]; Ref: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/keys
The Object.keys() method returns an array of a given object's own enumerable properties, in the same order as that provided by a for...in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).
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