---
title: "mercatorXToLongitude | 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.

# Function mercatorXToLongitude

-   mercatorXToLongitude(x: number): number[](#mercatorxtolongitude)
    
    Converts a mercator X (west-east axis in \[0, 1\]) to wgs84 longitude
    
    #### Parameters
    
    -   x: number
    
    #### Returns number