I need to print console from the firebase data

I am new to ionic 3 and just started with backend process. i need to print value of various parameter in console using this am getting key value. i need to fetch data inside the key. thanks in advance
this.TaskList$ = this.taskls.getItemList().snapshotChanges().map(
changes => {
return changes.map(c => ({
key: c.payload.key, …c.payload.val(),



Use AngularFire, not snapshotChanges. Their docs explain in detail how to build with Ionic.