---
title: "ModelJudgeError.jsonDecodingFailed(response:underlying:)"
framework: evaluations
role: symbol
role_heading: Case
path: "evaluations/modeljudgeerror/jsondecodingfailed(response:underlying:)"
---

# ModelJudgeError.jsonDecodingFailed(response:underlying:)

The evaluator fails to decode the JSON from the model-as-judge’s response.

## Declaration

```swift
case jsonDecodingFailed(response: String, underlying: any Error)
```