# setParam()

Sets a single parameter for an action. Use parameters to pass data to an Apex action.

## Signature

`setParam (String key, Object value)`

## Parameters

***key*:** Type: `String`. The parameter name.

***value*:** Type: `Object`. The parameter value.

**See Also**

- [Calling a Server-Side Action](/docs/platform/aura-platform/guide/controllers-server-actions-call.md)