I'd say it all depends on how/where (and how easily) you want to write, read, action, and report on the data.
Marketo Flow steps (on their own) can assemble JSON arrays of objects, given a single object as input, say, from a form post. You need three steps/fields:
- lastObject is a single object
- { "key1" : "value1", "key2", "value2" }
- intermediateListOfObjects is the typical comma-delimited history field using Change Data Value
- {{Lead.LastObject}} , {{Lead.intermediateList}}
- arrayOfObjects to the value of intermediateObjectList, wrapped in [] so it's now a valid JSON array
- [ {{Lead.intermediateObjectList}} ]
Certainly it's easier to use FlowBoost because it's JSON-fluent (you wouldn't need the intermediate list). But it's possible to write an append-only JSON field without FB.
In your example, you're reading a single property ("eventID") off the last event in the array. That would result in a webhook response like this:
{
"response" : 12345
}
I don't know exactly what you want to do with the response, though. You don't have to map it back to a lead field, since you can use the Webhook is Called trigger to take action on the contents of the response without actually saving the contents. This is an efficient way to avoid creating extra fields.
.png)