I do know how to fetch a LIST of contacts from Zoho CRM using email (see https://www.zoho.com/deluge/help/crm/get-records.html).

However, I wish to fetch just ONE record (our CRM never has duplicate email fields for contacts) and grab the ContactID for additional processing. 

The code I use to fetch the contact list by email is: 

contactList = zoho.crm.searchRecords("Contacts","(Email:equals:".concat(emailString).concat(")")); 

Note: the variable emailString is the email address passed into my deluge script. 

However, I cannot determine

a. how to check to see if the search returned a contact (that is, does a contact exist with that email)

b. how to then get just the first contact from the list and extract the id field.

Any help would be greatly appreciated.