Quick question, has anyone seen this weird error? with our custom Data Action in Architect. The call succeeds locally via Postman but fails with a 500 Internal Server Error when triggered from the flow, specifically when the payload exceeds 2KB. Here is the configuration:
actionId: da_12345
timeout: 10000
payload:
- name: contactId
type: string
- name: metadata
type: object
nested: true
Anyone see this behavior with complex object types?
What’s happening here is that Genesys Cloud Architect Data Actions handle large nested JSON objects differently than standard REST endpoints. In Zendesk, we were used to pushing massive ticket metadata payloads in a single JSON blob without hitting internal truncation limits. Genesys Cloud, however, imposes stricter serialization constraints on the payload parameter within the Architect flow context, especially when nested: true is involved.
When the payload exceeds roughly 2KB, the internal serializer in the Data Action node often fails to parse the deep object structure correctly, resulting in that generic 500 error. The fix is to flatten the structure or split the heavy metadata into separate string parameters. Instead of sending a complex object, try serializing the metadata into a JSON string first.
Here is how to adjust the configuration:
actionId: da_12345
timeout: 10000
payload:
- name: contactId
type: string
- name: metadataString
type: string
In your previous Architect step, use a Set Variable action to convert the object to a JSON string: {{json.stringify(metadata)}}. Then pass this string to the Data Action. On the receiving end (your API), you will need to parse it back to JSON. This mirrors how we had to handle large ticket updates during our Zendesk-to-GC migration, where splitting complex objects into strings prevented timeout and serialization errors. It feels less elegant than direct object passing, but it is much more reliable in Genesys Cloud. This approach also helps with debugging, as you can see the exact string being passed in the interaction log, unlike the opaque object failure we saw before. Try this stringification method and see if the 500 error disappears.