What is the correct MIME Type for JSON content?

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What is the correct JSON content type?

I have problem with JSON is that it is only displaying " Content-Type: text/html" I am testing on localhost and my online code is

header('Access-Control-Allow-Origin: *');

header('Content-Type: application/javascript');
//header('Content-type: text/javascript');
//header('Content-type: application/json');