---
title: querystring.clean
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/functions/query-string/querystring-clean
---

```
STRING querystring.clean(STRING url)
```

**Available in:** all subroutines

Returns the given URL without empty parameters. Parameters are considered empty when their names are empty. Effectively, this strips a malformed query string of superfluous separators, such as a trailing `?` or extra ampersands:

- `/path?name=value&&=value-only&name-only` becomes `/path?name=value&name-only`
- `/path?` becomes `/path`

## Example

```vcl
set req.url = querystring.clean(req.url);
```