http headers - What is the correct JSON content type?

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I've been messing around with href="http://en.wikipedia.org/wiki/JSON" rel="noreferrer">JSON for some
time, just pushing it out as text and it hasn't hurt anybody (that I know of), but I'd
like to start doing things properly.

I have seen
so many purported "standards" for the JSON content
type:

application/json
application/x-javascript
text/javascript

text/x-javascript
text/x-json

But
which one is correct, or best? I gather that there are security and browser support
issues varying between them.

I know there's a
similar question, href="https://stackoverflow.com/questions/404470/what-mime-type-if-json-is-being-returned-by-a-rest-api">What
MIME type if JSON is being returned by a REST API?, but I'd like a
slightly more targeted answer.

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class="normal">Answer

For JSON
text:

application/json

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

For
JSONP
(runnable javascript) with
callback:

application/javascript

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