---
title: key
framework: metalkit
role: symbol
role_heading: Type Property
path: metalkit/mtkmodelerror/key
---

# key

The key used to retrieve an error string from an error object’s userInfo dictionary.

## Declaration

```swift
static let key: MTKModelError
```

## See Also

### Constants

- [domain](metalkit/mtkmodelerror/domain.md)