Genesys Cloud Webhook to ServiceNow: 400 Bad Request with nested JSON in Data Action

NICE CXone API & Integrations
1

I can’t seem to figure out why the Data Action integration is failing when pushing complex incident objects to ServiceNow via the POST /api/v2/integrations/datadirectories/.../execute endpoint. The payload structure matches the ServiceNow REST API documentation for incident.create, yet the webhook consistently returns a 400 Bad Request.

The issue seems isolated to nested JSON fields. When the payload contains a simple string for short_description, the call succeeds. However, introducing a nested object for assignment_group or category triggers the failure. The response body indicates: {"errors":[{"message":"Invalid JSON payload","code":"400"}]}.

I have verified the ServiceNow side using Postman with the exact same JSON structure and it works flawlessly. The Genesys Cloud logs show the outbound request is being formatted correctly before transmission. Is there a known limitation with nested JSON serialization in the current version of the Data Action connector? Or is this a specific encoding issue with the webhook trigger? I have checked the integration guide but found no mention of depth limits for JSON objects in this context.

2

Make sure you check the payload structure before sending it to the Data Action endpoint. The 400 Bad Request often happens because the nested JSON object is not properly serialized or the Content-Type header is missing. Genesys Cloud expects a specific format for the body parameter in the POST /api/v2/integrations/datadirectories/.../execute call.

When testing with JMeter, I found that the issue usually stems from how the JSON is constructed in the script. Here is what to verify:

  • Verify Content-Type Header: Ensure your JMeter HTTP Request sampler has Content-Type: application/json set in the Header Manager. Without this, the Genesys API might misinterpret the payload.
  • Flatten Nested Objects: ServiceNow APIs sometimes struggle with deeply nested JSON in webhook bodies. Try flattening the incident object if possible. For example, instead of {"incident": {"short_desc": "test"}}, send {"short_desc": "test"} directly if the Data Action is configured to map fields directly.
  • Check for Special Characters: Escape any special characters in string values. Unescaped quotes or backslashes in short_desc will break the JSON parser and cause a 400 error.
  • Inspect Raw Request: Use the JMeter “View Results Tree” listener to see the exact raw request body being sent. Compare it with a successful curl command. The difference is often in how the JSON is formatted.

Here is a sample JMeter JSON body that works for simple incidents:

{
 "short_description": "Test Incident",
 "priority": "2",
 "category": "Software"
}

If the issue persists, reduce the complexity of the JSON in your load test. Start with a single field and add more until it fails. This helps isolate which nested field is causing the parser to reject the request. The rate limits are not the issue here, but payload validation is strict.

3

The easiest fix here is this is… to ensure body is a raw string, not an object. Try body: json.MarshalIndent(payload, "", " ") instead of passing the struct directly. The API rejects nested objects in the Data Action payload.