Convert topojson to osm

  1. Download and install the latest version of Filestar.

  2. Right click on one or more Topojson file(s) on your desktop and select Convert with Filestar.

  3. Type convert to osm in the search box.

  4. Press Convert.

  5. Or let an AI agent do it: filestarcli -i file.topojson -c "convert to osm" (how).

Let your AI agent convert TOPOJSON to OSM

Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine.

Install Filestar and add it to your agents:

npm install -g filestar
filestarcli agent install

Then ask your agent:

“Convert the TOPOJSON files in my Downloads folder to OSM”

Or run it yourself:

filestarcli -i file.topojson -c "convert to osm"

Runs on your computer, so your files stay on it. Works on Windows, macOS and Linux. 50 free conversions with the npm install, no account needed.

Can my AI agent convert TOPOJSON to OSM?

Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.topojson -c "convert to osm" on your computer, so your files stay on it.

Using Filestar With AI Agents → · Download SKILL.md

What is the difference between .topojson and .osm?

Extension
.topojson
.osm
Category
GIS
GIS
Developer
Mike Bostock
OpenStreetMap
Description
TopoJSON is a file format for encoding geographic data structures, based on the GeoJSON format. It encodes geometries more efficiently and supports topology, which enables more accurate representations of geographic objects. TopoJSON eliminates redundancy and simplifies data, making it smaller and easier to work with.
An OSM file contains street map information in the OpenStreetMap (OSM) format. It saves XML-formatted data in the form of "nodes" (points), "ways" (connections), and "relations" (street and object properties, such as tags).
MIME Type
application/vnd.geo+json
application/octet-stream

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