For JSON text:
application/json
The MIME media type for JSON text is
application/json. The default encoding is UTF-8. (Source: RFC 4627)
For JSONP (runnable JavaScript) with callback:
application/javascript
Here are some blog posts that were mentioned in the relevant comments:
- Why you shouldn’t use
text/htmlfor JSON - Internet Explorer sometimes has issues with
application/json - A rather complete list of Mimetypes and what to use them for
- The official mime type list at IANA from @gnrfan’s answer below
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