# qValueExpression

An expression value is an expression that returns a single numeric value.

Example:

```
fields : {
	qValueExpression : "=Count (DISTINCT $Field)"
}
```

## Properties

[Engine API documentation](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/EngineJSONAPI/Content/models-valueexpression.htm) for a complete description of the qValueExpression properties.

## Learn more

* [Generic object in visualization extensions](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/Extensions/Content/Sense_Extensions/Overview/generic-object.htm)