Validate a custom field of a Contact in Sales

Hi Lucia! Custom fields in Sell don't have a regex option to use for validation like we have in Support, so there is no native functionality to do this. How are you sending this data to your external service? If it's a custom app, you could always build validation into your app before sending it. 

Hi Greg,

I reply to yours question.

"How are you sending this data to your external service?"

I use a custom app located in the person card of deal and i use the zaf client object int this way:

//i am in contact sidebar custom app
client.on("deal.customFields:myCustumFields.changed").then(function(customField){
   let validation = call_myExternaService(customField.newValue);
   if(!validation){
      //here i have to prevent the contact from being saved
   }
}