componentDidMount(){ // To Fetch Child Data in JavaScript if(!firebase.apps.length){ firebase.initializeApp(config); } const user = firebase.auth().currentUser; //To Replace Email dot with Comma var NewText = user.email.replace(".", ","); if (user) { firebase.database().ref('Patient_Appointments/'+NewText).on('value',datasnap=>{ if(datasnap.val()){ console.log() this.setState({myList:Object.values(datasnap.val())}) } } ) } }