---
title: formatString
framework: metrickit
role: symbol
role_heading: Instance Property
path: metrickit/crashdiagnostic/objectivecexceptionreason/formatstring
---

# formatString

A string representing the exception message before arguments are substituted.

## Declaration

```swift
let formatString: String
```

## See Also

### Exception description

- [composedMessage](metrickit/crashdiagnostic/objectivecexceptionreason/composedmessage.md)
- [arguments](metrickit/crashdiagnostic/objectivecexceptionreason/arguments.md)