content type json
snippet in javascript

http content type json

user6466

application/json

content type json

user9566

application/json

what content-type is html

user3269

Content-Type:text/html

what is the correct json content type

user5369

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