Trying to prevent duplicate users with same email address in my custom user table

[Thomas Miles]

I am writing a client script to stop a user from creating a new user record if the same address is in the system already

function onSubmit() {
    //Type appropriate comment here, and begin script below
    var currentEmail = g_form.getValue('email');
    
    var newUser = new GlideRecord('table_name');
    newUser.addQuery('email', currentEmail);
    newUser.query();
    if (newUser.next()) { 
        return false;
        
    }
}

[Hajar BENJAHHAR]

Hello, 

No need to create a client script to verify if a user has the same email. 

You have only to check Unique for email field in User [sys_user] table. 

This will not let  to create two users with same email. 

[Thomas Miles]

i have my own custom user table will this option is not available in my scoped app

[Kristy Merriam]

I believe you can still use this feature but may have to add it to your Dictionary Entry form for your custom field/table.

[Thomas Miles]

does it need to be added from the global side?