---
title: reason
framework: network
role: symbol
role_heading: Instance Property
path: network/nwprotocolquic/applicationerror/reason
---

# reason

The QUIC application error reason.

## Declaration

```swift
let reason: String?
```

## See Also

### Inspecting Application Errors

- [code](network/nwprotocolquic/applicationerror/code.md)