kibana/docs/development/plugins/expressions/public/kibana-plugin-plugins-expressions-public.expressionrenderdefinition.validate.md
2020-09-30 09:10:28 +02:00

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[Home](./index.md) &gt; [kibana-plugin-plugins-expressions-public](./kibana-plugin-plugins-expressions-public.md) &gt; [ExpressionRenderDefinition](./kibana-plugin-plugins-expressions-public.expressionrenderdefinition.md) &gt; [validate](./kibana-plugin-plugins-expressions-public.expressionrenderdefinition.validate.md)
## ExpressionRenderDefinition.validate property
Used to validate the data before calling the render function.
<b>Signature:</b>
```typescript
validate?: () => undefined | Error;
```