---
title: "expression | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> 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.

# Variable expression`Const`

expression: {  
    createExpression: typeof [createExpression](https://docs.maptiler.com/sdk-js/api-reference/functions/createExpression/);  
    createPropertyExpression: typeof [createPropertyExpression](https://docs.maptiler.com/sdk-js/api-reference/functions/createPropertyExpression/);  
    isExpression: typeof [isExpression](https://docs.maptiler.com/sdk-js/api-reference/functions/isExpression/);  
    isExpressionFilter: typeof [isExpressionFilter](https://docs.maptiler.com/sdk-js/api-reference/functions/Externals.isExpressionFilter/);  
    isZoomExpression: typeof [isZoomExpression](https://docs.maptiler.com/sdk-js/api-reference/functions/isZoomExpression/);  
    normalizePropertyExpression: typeof [normalizePropertyExpression](https://docs.maptiler.com/sdk-js/api-reference/functions/normalizePropertyExpression/);  
    StyleExpression: typeof [StyleExpression](https://docs.maptiler.com/sdk-js/api-reference/classes/StyleExpression/);  
    StylePropertyFunction: typeof [StylePropertyFunction](https://docs.maptiler.com/sdk-js/api-reference/classes/StylePropertyFunction/);  
    ZoomConstantExpression: typeof [ZoomConstantExpression](https://docs.maptiler.com/sdk-js/api-reference/classes/ZoomConstantExpression/);  
    ZoomDependentExpression: typeof [ZoomDependentExpression](https://docs.maptiler.com/sdk-js/api-reference/classes/ZoomDependentExpression/);  
}

#### Type Declaration

-   ##### createExpression: typeof [createExpression](https://docs.maptiler.com/sdk-js/api-reference/functions/createExpression/)
    
-   ##### createPropertyExpression: typeof [createPropertyExpression](https://docs.maptiler.com/sdk-js/api-reference/functions/createPropertyExpression/)
    
-   ##### isExpression: typeof [isExpression](https://docs.maptiler.com/sdk-js/api-reference/functions/isExpression/)
    
-   ##### isExpressionFilter: typeof [isExpressionFilter](https://docs.maptiler.com/sdk-js/api-reference/functions/Externals.isExpressionFilter/)
    
-   ##### isZoomExpression: typeof [isZoomExpression](https://docs.maptiler.com/sdk-js/api-reference/functions/isZoomExpression/)
    
-   ##### normalizePropertyExpression: typeof [normalizePropertyExpression](https://docs.maptiler.com/sdk-js/api-reference/functions/normalizePropertyExpression/)
    
-   ##### StyleExpression: typeof [StyleExpression](https://docs.maptiler.com/sdk-js/api-reference/classes/StyleExpression/)
    
-   ##### StylePropertyFunction: typeof [StylePropertyFunction](https://docs.maptiler.com/sdk-js/api-reference/classes/StylePropertyFunction/)
    
-   ##### ZoomConstantExpression: typeof [ZoomConstantExpression](https://docs.maptiler.com/sdk-js/api-reference/classes/ZoomConstantExpression/)
    
-   ##### ZoomDependentExpression: typeof [ZoomDependentExpression](https://docs.maptiler.com/sdk-js/api-reference/classes/ZoomDependentExpression/)