Custom redirect to a thank you page after a customer creates an account on Shopify

gistfile1.txt

Navigate to your Shopify Admin dashboard.

Go to Online Store > Themes.

Click on Actions > Edit code for the theme you are currently using.

In the Sections folder, locate or create a file named register.liquid.

Add the following code to the register.liquid file:

<script>
  document.addEventListener("DOMContentLoaded", function() {
    document.querySelector('#create_customer').addEventListener('submit', function(event) {
      var form = this;
      var formData = new FormData(form);
      
      // Send a request to Shopify's customer creation endpoint
      fetch('/account', {
        method: 'POST',
        body: formData
      })
      .then(function(response) {
        if (response.ok) {
          // Redirect to the thank you page upon successful account creation
          window.location.href = '/pages/thank-you'; // Replace '/pages/thank-you' with the URL of your thank you page
        } else {
          // Handle errors if needed
          console.error('Failed to create customer account');
        }
      })
      .catch(function(error) {
        console.error('Error:', error);
      });
      
      // Prevent the form from submitting normally
      event.preventDefault();
    });
  });
</script>

Replace '/pages/thank-you' with the actual URL of your thank you page.

Save the changes.