---
title: Keys for Items Accessed in JavaScript Code
framework: foundation
role: collectionGroup
role_heading: API Collection
path: foundation/keys-for-items-accessed-in-javascript-code
---

# Keys for Items Accessed in JavaScript Code

Keys in property list items that the system recieves from or sends to JavaScript code.

## Topics

### Constants

- [NSExtensionJavaScriptPreprocessingResultsKey](foundation/nsextensionjavascriptpreprocessingresultskey.md)
- [NSExtensionJavaScriptFinalizeArgumentKey](foundation/nsextensionjavascriptfinalizeargumentkey.md)

## See Also

### Constants

- [NSItemProvider.CompletionHandler](foundation/nsitemprovider/completionhandler.md)
- [NSItemProvider.LoadHandler](foundation/nsitemprovider/loadhandler.md)
- [Options Dictionary Key](foundation/options-dictionary-key.md)
- [errorDomain](foundation/nsitemprovider/errordomain.md)
- [NSItemProviderFileOptions](foundation/nsitemproviderfileoptions.md)
- [NSItemProviderReading](foundation/nsitemproviderreading.md)
- [NSItemProviderWriting](foundation/nsitemproviderwriting.md)
- [NSItemProviderRepresentationVisibility](foundation/nsitemproviderrepresentationvisibility.md)
- [NSItemProvider.ErrorCode](foundation/nsitemprovider/errorcode.md)