---
title: symbologies
framework: vision
role: symbol
role_heading: Instance Property
path: vision/detectbarcodesrequest/symbologies
---

# symbologies

The barcode symbologies that the request detects in an image.

## Declaration

```swift
var symbologies: [BarcodeSymbology]
```

## Discussion

Discussion By default, a request scans for all symbologies. Specify a subset of symbologies to limit the request’s detection range.

## See Also

### Configuring a request

- [supportedSymbologies](vision/detectbarcodesrequest/supportedsymbologies.md)
- [BarcodeSymbology](vision/barcodesymbology.md)
- [coalescesCompositeSymbologies](vision/detectbarcodesrequest/coalescescompositesymbologies.md)