Logging in with email/password

Relax. We'll talk through this in plain words — no textbook voice.

Logging in with email/password

To log an existing user in with Firebase Auth, use signInWithEmailAndPassword.

Code Example

javascript

import { getAuth, signInWithEmailAndPassword } from 'firebase/auth';

const auth = getAuth();

async function login(email, password) {
  try {
    const userCredential = await signInWithEmailAndPassword(auth, email, password);
    console.log('Logged in:', userCredential.user.email);
  } catch (error) {
    console.log('Login failed:', error.code);
  }
}

login('student@example.com', 'StrongPass123');

What to keep in mind

Once login succeeds, Firebase keeps track of the session for you. To pick the login state back up even after a page refresh, use onAuthStateChanged.

Expected outputLogged in: student@example.com

Security note

Don't store the password in localStorage. Firebase Auth already handles session management for you, so there's no need to cache the password yourself.