> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lucidworks.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Query Pipeline Stage Template Expression Variables
export const LwTemplate = ({title = "Key questions to get you started", icon = "sparkles", cta = "Powered by Agent Studio", linkHref = "https://lucidworks.com/demo/?utm_source=docs&utm_medium=referral&utm_campaign=docs_cta_ai"}) => {
const [isLoaded, setIsLoaded] = useState(false);
useEffect(() => {
const timer = setTimeout(() => {
setIsLoaded(true);
}, 500);
return () => clearTimeout(timer);
}, []);
return
{isLoaded && `
}} />}
Powered by Lucidworks Agent Studio
;
};
[localhost link]: http://localhost:3000/docs/4/fusion-server/reference/template-expressions/query-pipeline-variables
[mintlify link]: https://doc.lucidworks.com/docs/4/fusion-server/reference/template-expressions/query-pipeline-variables
[old doc.lw link]: https://doc.lucidworks.com/fusion-server/4.2/398
Query stages have the following variables available:
* `ctx`. [Context](https://javadoc.lucidworks.com/fusion-pipeline-javadocs/4.2/com/lucidworks/apollo/pipeline/Context.html): used to pass variables between stages
* `reqResp`. [QueryRequestAndResponse](https://javadoc.lucidworks.com/fusion-pipeline-javadocs/4.2/com/lucidworks/apollo/pipeline/query/QueryRequestAndResponse.html): deserializes pre-request parameters and makes them available
The format required is ``.
## Example
Check that a query has an `fq` filter on a given field for a given value:
In the UI, set property name to `ids` and Property Value to `req.hasParam("fq")`
