---
title: "Change the case of labels | JavaScript maps SDK"
description: "Modify label text casing using upcase and downcase expressions."
---
> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.
# Change the case of labels
Use the [`upcase`](https://docs.maptiler.com/gl-style-specification/expressions/#upcase) and [`downcase`](https://docs.maptiler.com/gl-style-specification/expressions/#downcase) expressions to change the case of labels.
### NPM module setup
```bash
npm install --save @maptiler/sdk
```
#### main.js
```js
import { Map, MapStyle, config } from '@maptiler/sdk';
import '@maptiler/sdk/dist/maptiler-sdk.css';
config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';
const map = new Map({
container: 'map', // container id
style: MapStyle.STREETS,
center: [-116.231, 43.604], // starting position [lng, lat]
zoom: 11 // starting zoom
});
map.on('load', function () {
// data from opendata.cityofboise.org/
map.addSource('off-leash-areas', {
'type': 'geojson',
'data':
'https://docs.maptiler.com/sdk-js/assets/boise.geojson'
});
map.addLayer({
'id': 'off-leash-areas',
'type': 'symbol',
'source': 'off-leash-areas',
'layout': {
'icon-image': 'dog-park-11',
'text-field': [
'format',
['upcase', ['get', 'FacilityName']],
{ 'font-scale': 0.8 },
'\n',
{},
['downcase', ['get', 'Comments']],
{ 'font-scale': 0.6 }
],
'text-font': ['Open Sans Semibold', 'Arial Unicode MS Bold'],
'text-offset': [0, 0.6],
'text-anchor': 'top'
}
});
});
```
#### index.html
```html
Change the case of labels | NPM example
```
#### style.css
```css
body {margin: 0; padding: 0;}
#map {position: absolute; top: 0; bottom: 0; width: 100%;}
```
### Basic JavaScript setup
```html
Change the case of labels
```
## Related examples
### [Icon image URL inside a rich text format label](https://docs.maptiler.com/sdk-js/examples/rich-text-format/)
Examples
Display rich text labels with texts and icons.
### [Display and style rich text labels](https://docs.maptiler.com/sdk-js/examples/display-and-style-rich-text-labels/)
Examples
Display multilingual rich text labels using format expressions.
### [Set map language](https://docs.maptiler.com/sdk-js/examples/language-map/)
Tutorials
This tutorial shows how to change the default map labels language.
### [Add a stretchable image to the map](https://docs.maptiler.com/sdk-js/examples/add-image-stretchable/)
Examples
Use stretchable images as background for map text labels.