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What is the correct JSON content type?


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


asked Jun 3, 2015 in JAVASCRIPT by rajesh
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3 Answers

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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
answered Jun 3, 2015 by rajesh
0 votes
For JSON:

Content-Type: application/json
For JSON-P:

Content-Type: application/javascript
answered Jun 3, 2015 by rajesh
0 votes
Of course, the correct MIME media type for JSON is application/json, but it's necessary to realize what type of data is expected in your application.

For example, I use Ext GWT and the server response must go as text/html but contains JSON data.

Client side, Ext GWT form listener

uploadForm.getForm().addListener(new FormListenerAdapter()
{
    @Override
    public void onActionFailed(Form form, int httpStatus, String responseText)
    {
        MessageBox.alert("Error");
    }

    @Override
    public void onActionComplete(Form form, int httpStatus, String responseText)
    {
        MessageBox.alert("Success");
    }
});
In case of using application/json response type, the browser suggests me to save the file.

Server side source code snippet using Spring MVC

return new AbstractUrlBasedView()
{
    @SuppressWarnings("unchecked")
    @Override
    protected void renderMergedOutputModel(Map model, HttpServletRequest request,
                                           HttpServletResponse response) throws Exception
    {
        response.setContentType("text/html");
        response.getWriter().write(json);
    }
};
answered Jun 3, 2015 by rajesh

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