javascript - Regular expression to check for content type applicationjson etc - Stack Overflow

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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???

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???

• javascript
• regex

Share Improve this question Follow asked Jun 25, 2016 at 22:51 user2727195user2727195 7,3402020 gold badges7373 silver badges121121 bronze badges

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4 Answers 4

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You can use RegExp /application\/json/

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

There are many json content types that don't begin with application/json. See 24 of them here. One example is application/geo+json

The regex /application\/[^+]*[+]?(json);?.*/ captures all of those and the vanilla application/json with or without charset information.

It works for:

application/json
application/json; charset=UTF-8
application/json-patch+json
application/geo+json

Per:

console.log("application/json".match(/application\/[^+]*[+]?(json);?.*/)[1])
console.log("application/json; charset=UTF-8".match(/application\/[^+]*[+]?(json);?.*/)[1])
console.log("application/json-patch+json".match(/application\/[^+]*[+]?(json);?.*/)[1])
console.log("application/geo+json".match(/application\/[^+]*[+]?(json);?.*/)[1])

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
}

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.

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