firebase login authentication problem

Question

i am doing a web application..so for that i have used fire-base login authentication so its properly for creating an account and login and it redirects to some page as expected but the problem comes when we enter wrong credentials /empty then it also redirects to another page.without verifying whether the given details are correct or not i have tried .but nothing seem work ...

`function validate(){

var email=document.getElementById("email");
var pass=document.getElementById("pass");

const promise=auth.createUserWithEmailAndPassword(email.value,pass.value);
promise.catch(e => alert(e.message));

firebase.auth().onAuthStateChanged(user => {
if(user){
window.location = "login.html";
}
});
}`
...

Answer 1

did u understand problem
that i have said that there is a problem on frebase.auth().onAuthStateChanged(user => {
if(user){
window.location = "login.html";
}
}); this can u know how
to solve