---
title: "extractLineStrings | 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 extractLineStrings

-   extractLineStrings(geoJson: [GeoJsonObject](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.GeoJsonObject/)): ([LineString](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.LineString/) | [MultiLineString](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.MultiLineString/))\[\][](#extractlinestrings)
    
    From a generic GeoJSON object extract thepossibly nested LineString and MultiLineString features it contains. The result is a flat array made of LineString and MultiLineString.
    
    #### Parameters
    
    -   geoJson: [GeoJsonObject](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.GeoJsonObject/)
    
    #### Returns ([LineString](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.LineString/) | [MultiLineString](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.MultiLineString/))\[\]