How to run TopoJSON on Mac?

I need to bind a CSV file to topojson. I installed Node js with brew.

I can successfully run the command npm install -g topojson but when I put in which topojson, it doesn't return any file path.

I checked to confirm I have the command line tools installed and I do.

My command to bind the CSV returns -bash: topojson: command not found even though the npm install -g topojson command runs smoothly.

#node-js #json