Validate Email Format on Custom Login Page
Sep 10, 2025
Overview
This article details how to validate the email format when using a Custom Login page (Embedded Login or Classic Universal Login).
Applies To
- Embedded Login
- Classic Universal Login
Solution
The same library can be used with a fully custom login widget. Here is a simplified sample code using this library:
<script type="text/javascript" src="validator.min.js"></script>
<script type="text/javascript">
if (validator.isEmail('foo@bar.com')) {
webAuth.redirect.signupAndLogin ();
} else {
alert("Email validation failed");
}; //=> true
</script>
On this GitHub link there is a real example on how to use the library along with our Custom Classic login page. For more information about how to customize the Classic Universal Login page, see this documentation.NOTE: The example above implements Client Side validation only on signup. It is possible to adapt the code to do it upon login too.
