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Build a logout button with HTML

In this section, we create a custom logout button that will:

#Example: custom logout button

You can clone the example logout button on CodePen(opens new window) and make edits, or follow along below.

The example form has the Userfront Core JS library added to the document, as described in the next section.

#Add the Userfront Core JS library

You can add the Userfront Core JS library by CDN or using npm.

You only need to do one of these.

#CDN

#NPM

Then import the library into your file(s)

#Set up the button

Create your logout button with the elements you want to use.

In this case, we're using a custom-styled <button> element that is red when active and gray if the user is not logged in.

#Call Userfront.logout() when clicked

The logout() method allows you to log out a user.

Userfront then does the following:

  1. Invalidates the user's current session
  2. Clears any Userfront-issued tokens from the browser
  3. Redirects the page to the After-logout path

If the user is not logged in, calling Userfront.logout() will not do anything.

#Example JavaScript

In the example code here, we do the following:

  1. Reference all the button with a variable
  2. Enable the button if the user is logged in by calling Userfront.tokens.accessToken. If the user is logged in, this will return a value and the if statement will evaluate to true.
  3. Add a buttonLogout() function we can call to handle the button click
  4. Add an event listener to call buttonLogout() when the form is submitted

#Disabled state

You are not required to show the button when the user is not logged in; usually the logout button is only shown on pages where the user must be logged in.

You can show a disabled state by adding the disabled property to the button's HTML.

If the user is logged in, Userfront.tokens.accessToken will return a value, so we can test against this and enable the button by setting buttonEl.disabled = false. This removes the disabled property from the button.

#Clearing tokens

Whenever Userfront.logout() is called, the method makes an API call to Userfront to invalidate the user's current session and clear any refresh tokens.

The method then removes the access token and ID token cookies from the browser.

#Redirect after logout

Once the user's session has been invalidated and their tokens have been cleared from the browser, the browser is redirected to your account's After-logout path.

If the user is not logged in and Userfront.logout() is called, the browser will not be redirected.