What's the proper mime type for serving a topojson file?

[benbalter]

Should it be application/json or application/geo+json (or something else)?

[scardine]

The file format is valid JSON, so application/json is not incorrect. I would use that unless your application needs to differentiate between other JSON-based data formats at the request level.

[mbostock]

I recommend application/json until there is a more specific alternative that is standardized (such as application/topo+json, but I’m not familiar with the standardization process).

[jseppi]

Sean Gillies over at Mapbox spearheaded the application/geo+json effort (ref: RFC7946), so if you are interested in heading down that road you might want to talk to him. As a casual observer, it seemed like quite an arduous process.

[benbalter]

🤘. We're going with application/json for GitHub Pages, but wanted to check in to be sure (because since the RFC, geojson is now application/geo+json). Thanks for the context.