Solved : The Read and Write Rules were set to False. I thought I set them to true when I created the project. I am not sure why and how they turned to False again.

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So I am just getting started with Firebase. Downloaded the CLI, init a project from a CLI and deployed it to Firebase hosting. However I can't get the .on() function to work for the database neither I can figure out how to read a value from the Database. I have been tried looking at several videos and the documentation and I have no idea whats wrong.

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All the code is in the index.html. I do have an entry named object in the Database.

     try {
    let app = firebase.app();
    let features = ['auth', 'database', 'messaging', 'storage'].filter(feature => typeof app[feature] === 'function');
    document.getElementById('load').innerHTML = `Firebase SDK loaded with ${features.join(', ')}`;

    console.log("This code is working");

    //Get elements
    const preObject = document.getElementById('object');

    console.log(firebase.database());

    //Create Reference
    const dbRefObject = firebase.database().ref().child('object');

    //Sync Object
    dbRefObject.on('value', snap => console.log(snap.val()));

    firebase.database().ref("object/").on('value',function(snapshot){console.log(snapshot.val());});


} catch (e) {
  console.error(e);
  document.getElementById('load').innerHTML = 'Error loading the Firebase SDK, check the console.';
}
});