Specifiying content-type for JSON

I've have a VIEW, which can return either a JSON file or an
html template.

Does anybody know how I can use javascript, so the browser
can determine 
whether the response is either JSON or html text?

I presume that there is something in javascript that can
determine the 
content-type of the response,  but I struggling to find out
what it is.

One final question  - is there any other reason to tell the
browser that 
the response is of "application/json" 
content-type -  does it make the 
browser quicker or something?

Cheers



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