Firebase Permission Denied

Question

By default the database in a project in the Firebase Console is only readable/writeable by administrative users (e.g. in Cloud Functions, or processes that use an Admin SDK). Users of the regular client-side SDKs can't access the database, unless you change the server-side security rules.

---

You can change the rules so that the database is only readable/writeable by authenticated users:

{
  "rules": {
    ".read": "auth != null",
    ".write": "auth != null"
  }
}

See the quickstart for the Firebase Database security rules.

But since you're not signing the user in from your code, the database denies you access to the data. To solve that you will either need to allow unauthenticated access to your database, or sign in the user before accessing the database.

Allow unauthenticated access to your database

The simplest workaround for the moment (until the tutorial gets updated) is to go into the Database panel in the console for you project, select the Rules tab and replace the contents with these rules:

{
  "rules": {
    ".read": true,
    ".write": true
  }
}

This makes your new database readable and writeable by anyone who knows the database's URL. Be sure to secure your database again before you go into production, otherwise somebody is likely to start abusing it.

Sign in the user before accessing the database

For a (slightly) more time-consuming, but more secure, solution, call one of the signIn... methods of Firebase Authentication to ensure the user is signed in before accessing the database. The simplest way to do this is using anonymous authentication:

firebase.auth().signInAnonymously().catch(function(error) {
  // Handle Errors here.
  var errorCode = error.code;
  var errorMessage = error.message;
  // ...
});

And then attach your listeners when the sign-in is detected

firebase.auth().onAuthStateChanged(function(user) {
  if (user) {
    // User is signed in.
    var isAnonymous = user.isAnonymous;
    var uid = user.uid;
    var userRef = app.dataInfo.child(app.users);
    
    var useridRef = userRef.child(app.userid);
    
    useridRef.set({
      locations: "",
      theme: "",
      colorScheme: "",
      food: ""
    });

  } else {
    // User is signed out.
    // ...
  }
  // ...
});

I was facing similar issue and found out that this error was due to incorrect rules set for read/write operations for real time database. By default google firebase nowadays loads cloud store not real time database. We need to switch to real time and apply the correct rules.

As we can see it says cloud Firestore not real time database, once switched to correct database apply below rules:

{
   "rules": {
       ".read": true,
       ".write": true
     }
 }

Go to the "Database" option you mentioned.

1. There on the Blue Header you'll find a dropdown which says Cloud Firestore Beta
2. Change it to "Realtime database"
3. Go to Rules and set .write .read both to true

Copied from here.

Go to database, next to title there are 2 options:

Cloud Firestore, Realtime database

Select Realtime database and go to rules

Change rules to true.