I cannot save data to the database after creating user authentication

Question

I cannot save data to the database after creating user authentication on firebase, the following error appears on the console: "TypeError: firebase.auth (...). CurrentUser is null". it seems that the code cannot read the user's uid after creating the authentication

the code:

createUserButton.addEventListener('click', function(){
firebase.auth().createUserWithEmailAndPassword(emailInput.value, passwordInput.value)
    var user = {
        nome: "Pedro",
        sobrenome: "Ribeiro",
        cpf: "946.201.340-31",
        uid: firebase.auth().currentUser.uid,
        email: emailInput.value,
        password: passwordInput.value
    }
    writeUserData(user)

.catch(function(error) {
// Handle Errors here.
     })
})

function writeUserData(user) {
    firebase.database().ref('users/' + firebase.auth().currentUser.uid).set(user).catch(error =>{
    console.log(error.message)
  })
}

what needs to be changed so that the code can read the user's uid and save the data in the database?

Answer 1

You're not waiting until the new user creation process is complete before writing the database. createUserWithEmailAndPassword returns a promise which resolves when the work is done. It will give you a UserCredential object to work with.

firebase.auth().createUserWithEmailAndPassword(emailInput.value, passwordInput.value)
.then(userCredential => {
    // write the database here
})
.catch(error => {
    // there was an error creating the user
})