> ## Documentation Index > Fetch the complete documentation index at: https://help.privy.com/llms.txt > Use this file to discover all available pages before exploring further. # Use Liquid in Conversion Javascript > Inject information related to a sign up event into your custom JS code. Privy supports the use of Liquid variables in your custom conversion JavaScript (JS). These variables allow you to inject information related to a signup event, including contact and display information, into your custom JS code.  ## Supported variables The following variables are supported in your conversion JS: * `{{contact.email}}` — The email address of the contact who just signed up. * `{{contact.first_name}}` — The first name of the contact who just signed up. * `{{contact.last_name}}` — The last name of the contact who just signed up. * `{{signup.coupon_code}}` — The coupon code that was shown to the contact who just signed up. * `{{campaign.id}}` — The ID of the display associated with the contact's signup.  * `{{contact.custom_fields.custom_name}}` - The value associated with a custom field that was included in the display's form. ### Variable requirements + limitations The following requirements and limitations apply to custom fields: * A custom field variable must exactly match the name of the field in the Privy form. * The `{{contact.custom_fields}}` variable cannot be used; only individual fields are supported. * The only contact data that will be available for Liquid variable rendering after a form is submitted is the data that was collected during the current signup event. ## Include variables in your code Liquid variables and their associated attribute values are included in your code by applying a specific format to the custom JavaScript snippet. Typical use cases include: ### Print to console Print console code example ​If a user named "Joe Smith" with the email "[joesmith@example.com](mailto:joesmith@example.com)" just signed up, the above code will print "Joe Smith ([joesmith@example.com](mailto:joesmith@example.com)) just signed up!" to the console. ### Redirect and pass a variable value Redirect and pass a variable code example The above code will redirect the user after signing up and pass the display id as a URL parameter to the new page.