---
title: "canonicalLocaleIdentifier(from:)"
framework: foundation
role: symbol
role_heading: Type Method
path: "foundation/nslocale/canonicallocaleidentifier(from:)"
---

# canonicalLocaleIdentifier(from:)

Returns the canonical identifier for a given locale identification string.

## Declaration

```swift
class func canonicalLocaleIdentifier(from string: String) -> String
```

## Parameters

- `string`: A locale identification string.

## Return Value

Return Value The canonical identifier for an the locale identified by string.

## See Also

### Converting Between Identifiers

- [components(fromLocaleIdentifier:)](foundation/nslocale/components(fromlocaleidentifier:).md)
- [localeIdentifier(fromComponents:)](foundation/nslocale/localeidentifier(fromcomponents:).md)
- [canonicalLanguageIdentifier(from:)](foundation/nslocale/canonicallanguageidentifier(from:).md)
- [localeIdentifier(fromWindowsLocaleCode:)](foundation/nslocale/localeidentifier(fromwindowslocalecode:).md)
- [windowsLocaleCode(fromLocaleIdentifier:)](foundation/nslocale/windowslocalecode(fromlocaleidentifier:).md)