Regular expression to check for content type application/json etc

Question

This particular application is returning content-type headers in the format application/json;charset=UTF-8

I'm not sure if this could change and get reduced to 'application/json' only or may be if I reuse this code somewhere else for?

My code is

response.headers['Content-Type'].match(/text\/application//json/i)

How to best check for content type application/json???

Answer 1

You can use RegExp /application\/json/

var response = {"Content-Type":"application/json;charset=UTF-8"};
console.log(response["Content-Type"].match(/application\/json/)[0]);

Answer 2

I think you are doing right, You can check this using regex . If it returns null then it means it is not json.

if (response.headers['Content-Type'].match(/application\/json/i)){

   // do your stuff here
}

Other way is to find application/json string in header string

if (response.headers['Content-Type'].contains('application/json')){

   // do your stuff here
}

Answer 3

There are multiple JSON content-types. Not all of them are "official", but if you are trying to match them all, try this regex:

^((application\/json)|(application\/x-javascript)|(text\/javascript)|(text\/x-javascript)|(text\/x-json))(;+.*)*$

You can add / delete content types from the regex, just remember to put proper parenthesis around them.