---
title: "MapTiler QGIS plugin - supported expressions | Guides | General"
description: "Supported GL JS style expressions for the MapTiler QGIS plugin."
---

> 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.

# MapTiler QGIS plugin - supported expressions

MapTiler plugin can convert any style.json containing GL JS style definition. However, the plugin does not support all of the style definition expressions. This article covers which expressions are supported and which are not.

Our cartographers continuously improve MapTiler map styles. Current styles available in MapTiler are the 4nd generation (version-4). There is`streets-v4`or`base-v4`. These styles use advanced style expressions in the style.json definition. Unfortunately, some of these expressions are not supported in the QGIS plugin. All the styles that come with the plugin by default are of version-1 and do not use advanced expressions but work OK in the plugin. The older versions of styles are not listed in MapTiler, however, they can be accessed like this:

-   OLD: [https://cloud.maptiler.com/maps/basic-v2/](https://cloud.maptiler.com/maps/basic-v2/)
-   NEW: [https://cloud.maptiler.com/maps/base-v4/](https://cloud.maptiler.com/maps/base-v4/)

## Filter expression

Filter expression defines which features will be affected by a specific style layer definition.  
**Combining filters**: all, any, none  
**Existential filters**: has, !has, match, get  
**Set membership filters**: in, !in  
**Comparison filters**: !, ==, !=, >=, >, <=, <

## Zoom function

zoom function changes a property of a style layer based on zoom level. Value must be literal values (i.e. not functions or expressions), and appropriate for the property. For example, stop output values for a `fill-color` function property must be colors.

```text
{
  "base":1,
  "stops": [
    [zoom1, value1],
    [zoom2, value2],
    [zoom3, value3]
  ]
}
```

## Interpolation

```text
[
  "interpolate",
  [method]          // options: ["linear"], ["exponential", base]
  ["zoom"],
  zoom1, value1,
  zoom2, value2,
  zoom3, value3
]
```

`Cubic-bezier` interpolation is not supported.

## Step

```text
[
"step",
input,          // e.g. ["get", "attribute"] or ["zoom"]
step_input_0, step_output_0,
stop_input_1, stop_output_1,
stop_input_n, stop_output_n,
...
]
```

Just one-level nested expressions in the interpolation function are supported. E.g.

```text
"line-color": ["interpolate",
                ["linear"],
                ["zoom"],
                10, "rgba(138, 195, 229, 1)",
                16, [
                  "match",
                  ["get", "class"],
                  ["river","canal"],
                  "rgba(160, 205, 236, 1)",
                  "rgba(140, 185, 226, 1)"
                ]
              ]
```

## Paint-properties

### Fill

**fill-color**  
Can be defined as a static value (string, hsl, hsla, RGB, rgba), using zoom function or interpolation.

**fill-outline-color**Can be defined as a static value (string, hsl, hsla, RGB, rgba), using zoom function or interpolation.

**fill-opacity**Can be defined as a static value, usingthe  zoom function or interpolation.  
If opacity is already set in color asan  alpha channel, this property is skipped.

**fill-translate**Can be defined as a static array or usinga  zoom function.

**fill-pattern**Can be defined as a string or usinga  zoom function

### Line

**line-color**Can be defined as a static value (string, hsl, hsla, RGB, rgba), using zoom function or interpolation.

**line-width**Can be defined as a static value, using zoom function or interpolation.

**line-offset**Can be defined as a static value, using zoom function or interpolation.

**line-opacity**Can be defined as a static value, using zoom function or interpolation.

**line-dasharray**Can be defined as a static array or using a  zoom function.

**line-cap**Can be `round`, `square` or `flat` (default).

**line-join**Can be `bevel`, `round` or `miter` (default).

### Labels

**text-field**Can be defined as a static string, expression, list of expression or using zoom function.

**text-size**an be defined as a static value, using zoom function or interpolation.

**text-max-width**Can be defined as a static value, using zoom function or interpolation.

**text-letter-spacing**Can be defined as a static value, using zoom function or interpolation.

**text-font**Can be defined as a static value (string), list of string or zoom function.  
If font not found on your system, the plugin will try to use fallback fonts:  
`Open Sans Regular`, `Arial Unicode MS`

**text-color**Can be defined as a static value (string, hsl, hsla, RGB, rgba), using zoom function or interpolation.

**text-halo-color**Can be defined as a static value (string, hsl, hsla, RGB, rgba), using zoom function or interpolation.

**text-halo-width**Can be defined as a static value (string, hsl, hsla, RGB, rgba), using zoom function or interpolation.

**text-halo-blur**Must be defined as a static value.

**text-transform**Must be `uppercase` or `lowercase`.

**text-offset**Can be defined as a static array or using zoom function.

**text-justify**Must be one of the following: `left`, `right`, `follow`, `center` (default).

**text-anchor**Must be one of the following: `center`(default), `left`, `right`, `top`, `bottom`, `top-left`, `top-right`, `bottom-left`, `bottom-right`.

**icon-image**Can be defined as a static string or using zoom function.

### Background

**background-color**Can be defined as a static value(string, hsl, hsla, RGB, rgba) or zoom function.

**background-opacity**Can be defined as a static value or zoom function.

## Useful links

[Vector tile basemaps via QGIS plugin](https://www.youtube.com/watch?v=iqGVDLMz2u8)  
[Expressions | GL Style Specification](https://docs.maptiler.com/gl-style-specification/expressions/)  
[Layers | GL Style Specification](https://docs.maptiler.com/gl-style-specification/layers/)  
[MapTiler QGIS plugin](https://www.maptiler.com/qgis-plugin/)