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For JSON text:

The MIME media type for JSON text is application/json. The default encoding is UTF-8. (Source: RFC 4627).

For JSONP with callback:

application/javascript

Here are some blog posts that were mentioned in the comments that are relevant.

• Why you shouldn't use text/html for JSON
• Internet Explorer sometimes has issues with application/json
• A rather complete list of Mimetypes and what to use them for