diff --git a/src/node/api.mjs b/src/node/api.mjs
index 0c9dd8a7..88b3f834 100644
--- a/src/node/api.mjs
+++ b/src/node/api.mjs
@@ -74,11 +74,11 @@ function transformArgs(opArgsList, newArgs) {
     return opArgs.map((arg) => {
         if (arg.type === "option") {
             // pick default option if not already chosen
-            return typeof arg.value === "string" ? arg.value : arg.value[0];
+            return typeof arg.value === "string" ? arg.value : arg.value[arg.defaultIndex ?? 0];
         }
 
         if (arg.type === "editableOption") {
-            return typeof arg.value === "string" ? arg.value : arg.value[0].value;
+            return typeof arg.value === "string" ? arg.value : arg.value[arg.defaultIndex ?? 0].value;
         }
 
         if (arg.type === "toggleString") {