---
title: data
framework: mapkitjs
role: symbol
role_heading: Instance Property
path: mapkitjs/tileoverlay/data
---

# data

A dictionary of custom properties to use with the URL template.

## Declaration

```data
get data(): Record<string, any>;
set data(data: Record<string, any>);
```

## Discussion

Discussion The data object holds a dictionary of custom properties to fill the urlTemplate. If the urlTemplate is a callback, MapKit JS passes the entire data object as a parameter. If the urlTemplate is a string, data key names should match up with the custom placeholder names. MapKit JS ignores the keys that don’t exist in the URL template string. The default value is {}. This example shows adding a customized tile overlay to a map. const customOverlay = new mapkit.TileOverlay("https://{subdomain}.customtileserver.com/{z}/{x}/{y}?scale={scale}&lang={lang}&imageFormat=jpg"); customOverlay.data = {     subdomain: "staging",     lang: mapkit.language }; map.addTileOverlay(customOverlay);

## See Also

### Customizing the tile overlay

- [imageForTile](mapkitjs/tileoverlay/imagefortile.md)
- [reload()](mapkitjs/tileoverlay/reload.md)