Implementing User Sign-Up with Supabase Auth | Authentication Made Simple with Supabase Auth | Supabase Made Easy: Your First Steps to Building with Open Source Firebase Alternative

One of the most fundamental aspects of any application is user authentication. Supabase Auth makes this process incredibly straightforward, offering a robust and secure way to manage user sign-ups and logins. In this section, we'll walk through the steps to implement user sign-up in your application using Supabase Auth.

Before we dive into the code, ensure you have your Supabase project set up and your Supabase client initialized in your application. If you haven't done this yet, head back to the previous sections for a refresher.

The core function we'll be using is auth.signUp() from the Supabase JavaScript client. This function handles the creation of a new user in your Supabase project's authentication system. It typically requires an email address and a password. Supabase also offers the option to send a confirmation email to the user upon sign-up, which is a highly recommended security practice.

import { createClient } from '@supabase/supabase-js'

const supabaseUrl = 'YOUR_SUPABASE_URL'
const supabaseAnonKey = 'YOUR_SUPABASE_ANON_KEY'

export const supabase = createClient(supabaseUrl, supabaseAnonKey)

Now, let's look at the actual sign-up function. We'll create a simple asynchronous function that takes an email and password, then calls supabase.auth.signUp().

async function signUpWithEmail(email, password) {
  const { data, error } = await supabase.auth.signUp({
    email: email,
    password: password,
  });

  if (error) {
    console.error('Error signing up:', error.message);
    return null;
  }

  console.log('Sign up successful! Check your email for a confirmation link.', data);
  return data;
}

In this code snippet:

We define an async function signUpWithEmail that accepts email and password as arguments.
supabase.auth.signUp() is called with an object containing the email and password.
The function returns an object with data and error. We check for error and log it if it occurs. If successful, data will contain information about the newly created user and a session. Importantly, Supabase will automatically send a confirmation email to the provided email address.