How to get the user ID token after sign-in on the web

Question

I use firebase-admin for node.js and firebase for react. I want to get access token to send it to my server in header for defend my data. I use this code on react app

firebase.auth().signInWithEmailAndPassword(form.elements.email.value, form.elements.password.value)
                .then((result) => {
                        console.log(result)
                })
                .catch(function(error) {
                    var errorCode = error.code;
                    var errorMessage = error.message;
                    console.log(errorMessage);
                });

but I dont know how to get token from result. Or i have some ways to work with API on my server? It should work like this: if user want to get to admin panel, he should sign in. Client get token, set in cookie ans use with any request?

Answer 1

The ID token is not available in the data returned from signInWithEmailAndPassword. What you can do instead is follow the documentation and use getIdToken() to get the token after sign-in finishes.

firebase.auth().currentUser.getIdToken(/* forceRefresh */ true).then(function(idToken) {
  // Send token to your backend via HTTPS
  // ...
}).catch(function(error) {
  // Handle error
});

The linked documentation goes on to explain how to validate the token on the backend using the Firebase Admin SDK.