Step 5: Implement User Registration

• Create a sign-up form where users can enter their email, password, and other profile details.
• Handle form submission by calling the Supabase authentication API:

      
      const { user, error } = await supabase.auth.signUp({
        email: email,
        password: password,
      },
      {
        data: {
          username: username,
          full_name: full_name,
          avatar\_url: avatarUrl
        }
      });
      
    

• Check for any errors and display messages accordingly.

Step 6: User Profile Management

• Once the user is signed up, store additional profile information in the `profiles` table.
• Fetch user profile data by querying the `profiles` table using the user ID:

      
      const { data, error } = await supabase
        .from('profiles')
        .select('\*')
        .eq('id', user.id);
      
    

• Allow users to update their profile information:

      
      const { data, error } = await supabase
        .from('profiles')
        .update({
          username: newUsername,
          full\_name: newFullName,
          avatar\_url: newAvatarUrl
        })
        .eq('id', user.id);
      
    

Step 7: Secure Profile Data

• Set up Row Level Security (RLS) policies in the Supabase dashboard to ensure that users can only access and modify their own profile data.
• Navigate to the "Policies" tab in your Supabase project.
• Create a new policy for the `profiles` table:
  • Action: Select
  • Expression: `auth.uid() = id`
• Repeat the process for update, insert, and delete actions if needed.

Step 8: Testing & Deployment

• Test your application thoroughly to ensure all functionalities work as expected.
• Deploy your application to a hosting service of your choice (e.g., Vercel, Netlify).
• Monitor Supabase logs and metrics to ensure seamless performance.
• Make iterative improvements based on user feedback and requirements.

By following these steps, you can successfully build and manage user profiles using Supabase in your web application.