AUTHENTICATION / LESSON 02

Clerk Basics.

What Clerk is and how it handles sign up and log in for you

Written by Andrew Lee JenkinsPublished Oct 5, 20264 min readFree lesson

Every app with users needs a way for people to sign up and log in. Clerk is the hosted option from the intro to this module... a service that runs that whole job for you.

A Quick Recap

Back in the What Is Authentication? lesson, we said authentication proves who someone is and authorization decides what they're allowed to do. Clerk handles the authentication part. Your app still handles authorization.

Enter Clerk

Clerk handles all of that login work for you. You add Clerk to your app, and right away you get this stuff.

Good looking login pages you can customize
Secure password storage
Social login (Google, Apple, GitHub, etc.)
Email verification
Two-factor authentication
Session management

How Clerk Works

So what actually happens when someone uses your Clerk-powered app? Let's walk through it.

Signing Up

Step 1. User Clicks 'Sign Up'

Your app shows a signup form. Clerk provides that form, so it looks professional and it works right out of the box.

Step 2. User Enters Information

The user types in their email and picks a password. Clerk checks that the password is strong enough (sorry, "password123").

Step 3. Clerk Sends Verification Email

To make sure the email is real, Clerk emails a short verification code (or a link, if you switch that on in the dashboard). That's how it keeps fake signups out.

Step 4. User Enters the Code

Typing in the code (or clicking the link) proves the user owns that email address. Now their account is active.

Step 5. Clerk Creates a Session

Clerk creates a "session," which is a secure way to remember that this user is logged in. From here your app can trust who they are.

Logging In

Step 1. User Enters Credentials

The user types their email and password into the login form.

Step 2. Clerk Verifies Password

Clerk checks whether the password is correct. And it does that securely, without EVER storing the actual password.

Step 3. Session Created

If the password checks out, Clerk creates a session. The user is logged in.

Step 4. Your App Knows Who They Are

Now your app can ask Clerk "who's the current user?" and get their info back. Pretty painless, right?

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