Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top


How do you convert GeoJSON data to TopoJSON?


Topojson files are often smaller than geojson and the conversion allows you to incrementally simplify a dataset, if you wish.

share|improve this question
Why the gdal tag? – blah238 Jan 3 '13 at 18:28
Gosh, good question. Not sure what I was thinking on that one :) Removed. – Jeff Jan 3 '13 at 20:53
Step 3: Convert the data: topojson -o output_file.json input_file.json not working!!!!!!!!!!!! – user21773 Sep 6 '13 at 17:00
topojson -o output_file.json input_file.json works for me under 1.1.0 and 1.4.0. Perhaps you can ask a formal question on here with more info on the problem you're having? Cheers! – Jeff Sep 6 '13 at 18:09
up vote 23 down vote accepted

Glad you asked, oh handsome OP.

Install topojson

From the command line (Mac OSX 10.8, assumes homebrew installed):

brew install node.js
npm install -g topojson

Convert The Data

topojson -o output.json input.json
share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

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