diff --git a/lib/cloudevent.js b/lib/cloudevent.js
index 4f05de3..3efd1c5 100644
--- a/lib/cloudevent.js
+++ b/lib/cloudevent.js
@@ -26,6 +26,9 @@ Cloudevent.prototype.format = function(){
   // Check the constraints
   this.spec.check();
 
+  // To run asData()
+  this.getData();
+
   // Then, format
   return this.formatter.format(this.spec.payload);
 };