Get user name of author from firebase

hi , l am try to build simple app database connection with firebase . l used authentication email and password for access to my app and he is working fine . And when l post in database he is working fine either . l am tired to find way to show the user name or the email address for who post in database , but unfortunately no way . there is any way to to show the user name or email address for anyone who post in databases ?

l try this code for showing email address but l got the same email only !

ionViewDidLoad() { =>{
    if ( && data.uid){
      this.adderss =




my real time databases


any solution please with simple code ?