---
title: WKWebExtension.MessagePort.Error.Code.messageInvalid
framework: webkit
role: symbol
role_heading: Case
path: webkit/wkwebextension/messageport/error/code/messageinvalid
---

# WKWebExtension.MessagePort.Error.Code.messageInvalid

Indicates that the message is invalid.

## Declaration

```swift
case messageInvalid
```

## Discussion

Discussion The message must be an object that is JSON-serializable.