Update Salesforce Objects with Server-Side JavaScript

sfmc-update-salesforce-objects-with-ssjs.html

<script type="text/javascript" runat="server">

    Platform.Load("core", "1");
    var debug = 1;

    // detect form submission 
    if (Request.Method == "POST") {

        // retrieve the input values from the form payload
        var subscriberKey = Request.GetFormField("subscriberKey");
        var email = Request.GetFormField("email");
        var firstName = Request.GetFormField("firstName");
        var lastName = Request.GetFormField("lastName");

        // ensure the subscriberKey has a value
        if (!isEmpty(subscriberKey)) {

          try {

            // update the SF object indicated by the subscriberKey
            var updateSFResults = updateSF(subscriberKey,0,email,firstName,lastName);

            if (debug) {
             Write("<br>updateSFResults: " + updateSFResults);
            }

          } catch (e1) {

              if (debug) {
                 Write("<br>e1: " + Stringify(e1));
              }

          } // of catch

        } // of sk check

    } // of post


    function isEmpty(str) {
      return (!str || 0 === str.length);
    }

    function updateSF(subscriberKey, HasOptedOutOfEmail, Email, FirstName, LastName) {

      var results = 0;

      var SFIDPattern = new RegExp("^[a-zA-Z0-9]{18}");

      if (SFIDPattern.test(subscriberKey) == true) {

          var fieldArr = [];
          fieldArr.push('HasOptedOutOfEmail');
          fieldArr.push(HasOptedOutOfEmail);
          fieldArr.push('Email');
          fieldArr.push(Email);

          if (!isEmpty(FirstName)) {
            fieldArr.push('FirstName');
            fieldArr.push(FirstName);
          }

          if (!isEmpty(LastName)) {
            fieldArr.push('LastName');
            fieldArr.push(LastName);
          }

          // detect Contact or Lead
          var sfObj = subscriberKey.substring(0,3) == "003" ? "Contact" : "Lead";

          var updateSFObject = "";
          updateSFObject += "\%\%[ ";
          updateSFObject += "set @SFUpdateResults = UpdateSingleSalesforceObject('" + sfObj + "',";
          updateSFObject += "'" + subscriberKey + "','"+  fieldArr.join("','") + "'";
          updateSFObject += ") ";
          updateSFObject += "output(concat(@SFUpdateResults)) ";
          updateSFObject += "]\%\%";

          try {

            results = Platform.Function.TreatAsContent(updateSFObject);

          } catch (e2) {

              if (debug) {
                  Write("<br>e2: " + Stringify(e2));
              }

          }

      }

      return results
    }
</script>
<!-- YOUR HTML AND FORM GOES HERE -->

Line number 69 should be
var sfObj = subscriberKey.substring(0, 3) == "003" ? "Contact" : "Lead";

Updated. Thank you!