---
title: parameters
framework: networkextension
role: symbol
role_heading: Instance Property
path: networkextension/neurlfiltermanager/parsingconfiguration/queryoptions/parameters
---

# parameters

An array of parameter names to extract.

## Declaration

```swift
var parameters: [String]?
```

## Discussion

Discussion Use a value of nil to include all query items. If you specify an array for parameters, the parser includes the query items in the result, in the specified order. For example, setting parameters to ["id", "external"] parses URL http://example.com/a/b/c?external&id=123&type=abc into http://example.com/a/b/c?id=123&external. Note in this example that the query separates items with the & character, and query items don’t necessarily have a value (such as external in this example).

## See Also

### Working with query options

- [excluded](networkextension/neurlfiltermanager/parsingconfiguration/queryoptions/excluded.md)