CXone Studio ASSIGN/IF branching logic failing on dynamic variable types

NICE CXone API & Integrations
1

Struggling to figure out why my Studio snippet is skipping the conditional branch entirely when the upstream REST proxy returns a null value. I am building a logic block that attempts to parse a JSON response from a custom integration and then branch based on the status field.

Here is my current snippet structure:

ASSIGN status_code = GetRESTProxy("integration_call").status
IF status_code == "active"
 ASSIGN next_action = "route_to_agent"
ELSE
 ASSIGN next_action = "voicemail"
END

The issue seems to be that when status is missing or null, the IF condition evaluates unpredictably. In Ruby, I would explicitly check for nil, but Studio’s ASSIGN action appears to coerce types in a way that breaks my equality check. I have tried wrapping the assignment in a try-catch block using Studio’s error handling, but the script still proceeds as if the variable is populated. Is there a specific way to validate the existence of a variable before using it in an IF statement within this scripting environment? I need a robust pattern for handling sparse API responses without causing the script to fail or take the wrong path.

2

I’d recommend looking at at how Studio handles null coercion compared to pure string comparison. The REST proxy often returns a JSON object or null, not a direct string. Comparing a null object to “active” fails silently in some runtime contexts.

  1. Validate the response type before branching. Use a Try-Catch block or a JSON Parse node to ensure the payload is valid.
  2. Explicitly handle nulls. Add a check for status_code != null before the equality comparison.
  3. Use the IsDefined function in your expression to prevent runtime errors.
{
 "conditions": [
 {
 "type": "expression",
 "expression": "IsDefined(GetRESTProxy(\"integration_call\").status) AND GetRESTProxy(\"integration_call\").status == \"active\""
 }
 ]
}

This ensures the logical operator short-circuits safely if the field is missing.

  • JSON parsing in Studio
  • IsDefined function usage
  • REST proxy error handling
  • Null value propagation
3

this is caused by type coercion issues in the studio runtime when comparing nullable json fields. the rest proxy returns null (type object) or undefined, which does not strictly equal the string "active". in typescript sdk terms, null == "active" is false, but the silent failure happens because the variable type isn’t initialized. you need to default the value. use the ternary operator or the || fallback in your assign block to ensure a string type. try this pattern:

// pseudo-code logic for studio assign
status_code = (GetRESTProxy("integration_call")?.status || "unknown");

if (status_code === "active") {
 next_action = "route_to_agent";
} else {
 next_action = "fallback";
}

check the raw response body first. if the upstream returns a 204 or empty body, status will be undefined. always sanitize external inputs before branching.