Does anyone know of a pure JavaScript library for doing geometry operations such as buffer, union, intersects, etc? I want to play with doing these operations in the browser. It looks like GeoScriptJS has some dependencies.

8 Answers 8


I'm pretty much done with my port of JTS which is a pure JS port and it's available at https://github.com/bjornharrtell/jsts

At the current version (0.9.1) it supports the core functionality of JTS by which I mean predicates and overlays.

  • Hey I recently finished JSTS 1.0 which is a complete and up to date port of JTS in modern JavaScript. Available at the same place as the 0.x version. Feb 29, 2016 at 20:07

You could look at the OpenLayers API, particularly the Geometry classes. You can check for intersects, and have access to vertices etc. I've implemented point buffers in the past just with OpenLayers. Unions may be trickier though.

For more complex operations you may want to do the processing server-side, and pass results back in WKT or GeoJSON, both of which OpenLayers can display. See this Union tutorial for an example.

Another possible option is Spatial Query a "JQuery like Javascript library for handling spatial maths." I'm not sure how well tested it is but as the source is available you should take a look.


There is now a JavaScript port of the JTS Topology Suite - https://github.com/bjornharrtell/jsts

  • I looked at OpenLayers geometries, and I think that the resize method would allow me to scale the geometries to get buffer-like results. But you're right, doing unions and intersections would all have to be done manually. Alas. What I really need is a pure JS port of JTS. JSTS? =)
    – atogle
    Mar 12, 2011 at 17:54
  • I've looked around a lot and I don't think that any comprehensive, mature, and pure JS solution really exists. Spatial Query really looks like the best thing out there for now, but I found a few other repos on GitHub that were helpful: github.com/shawnbot/geoff/blob/master/src/geoff.js and github.com/maxogden/geojson-js-utils
    – atogle
    Apr 1, 2011 at 17:12
  • @atogle - there is talk of moving the geometry functionality in OpenLayers to a separate library - osgeo-org.1803224.n2.nabble.com/… Apr 1, 2011 at 17:22
  • good to know!
    – atogle
    Apr 7, 2011 at 16:27

You could have a look on geoscript (implemented in severals langauages including JS)

  • 2
    I'm pretty sure that GeoScript JS is not meant to be run on the client/browser. The site says it's designed for RingoJS. It also appears to have JTS dependencies.
    – atogle
    Mar 12, 2011 at 17:51

If you need this for Google AppEngine, from what I read, JTS is officially compatible with Google App Engine. There is a basic demo at http://giscloud.appspot.com/


Turf is a javascript library providing a lot of spatial operations. It is also modular, so you can only include the functions you need in the final script.

  • Unfortunately it is seriously limited in terms of geometries and available operations. You can do point in polygon stuff but that seems to be basically it. Feb 11, 2016 at 10:40
  • Turf actually uses my own JSTS (but an older version) for many of its operations. If you use JSTS directly you have access to a more detailed API that can do alot more than Turf. See github.com/bjornharrtell/jsts. Feb 29, 2016 at 20:05
  • I found it tough to get JSTS working in a typescript application and Turf.js worked out of the box. JSTS is richer in functionality, but for my needs Turf.js worked just great.
    – HankCa
    Dec 10, 2019 at 3:25

You can use ArcGIS server REST API regardless of which API/language you are using. It provides all the methods exposed....


You can refer to opensource javascript geometry library @ geoJs.


As of 2022, for reference on similar questions, there is also the Geometry.js library (first release in 2019) that could fit for some needs, complementary with the nice JSTS library. It is pretty straight-forward for getting the area of polygons, calculating angles and scaling operations.

New contributor
Facyla is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.