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source: https://qlik.dev/extend/property-panel-basics/define-properties/
last_updated: 2025-07-08T16:09:30Z
---

# Overview - visualization extension properties

You can define your own properties for your visualization. Qlik Sense
automatically adds them to the property panel and takes care of persistence. You
then find the selected values in the layout parameter.

For every property, you define a JavaScript object with different fields
depending on what custom property type you are defining.

## Learn more

- [Reusing existing properties](https://qlik.dev/extend/property-panel-basics/extensions-reusing-properties/)
- [Adding custom properties](https://qlik.dev/extend/property-panel-basics/extensions-add-custom-properties/)