Method to Check whether the Response is JSON in PHP?

Question

I need a function to check whether the incomming response is JSON or NOT in PHP

For eg. my JSON is this

$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';

starting and ending ' removed and it looks like a valid JSON — Satya, Nov 26 '13 at 05:26

score 0 · Answer 1 · edited May 23 '17 at 12:33

0

You could use json_decode() on it and then check json_last_error(). If you have an error, it's not valid JSON.

Keep in mind it's not good enough to just check for null. The string null is valid JSON (and it decodes as such).

edited May 23 '17 at 12:33

Community

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answered Nov 26 '13 at 05:27

alex

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Roopendra · Answer 2 · 2013-11-26T05:42:45.497

-1

Yes you can validate Like this.

$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';

    if($json) {
       $ob = json_decode($json);
       if($ob === null) {
           echo 'Invalid Json';
       } else {
          echo 'Valid Json';
       }
    }

edited Nov 26 '13 at 05:42

answered Nov 26 '13 at 05:27

Roopendra

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`null` is valid JSON, AFAIK. – alex Nov 26 '13 at 05:27
json_decode is null then invalid Json – Roopendra Nov 26 '13 at 05:30
[Is it?](http://codepad.org/p1690dQg) – alex Nov 26 '13 at 05:30
No It is not http://codepad.org/Fq9DCRtq – Roopendra Nov 26 '13 at 05:32
That proves nothing. What did you expect the string `null` to deserialize to? – alex Nov 26 '13 at 05:33

score -1 · Answer 3 · edited May 23 '17 at 11:45

-1

$json_request = (json_decode($request) != NULL) ? true : false;

Taken from: PHP check whether Incoming Request is JSON type

Does that work?

edited May 23 '17 at 11:45

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answered Nov 26 '13 at 05:27

Hawiak

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You shouldn't just grab an answer from another and post it, even with attribution. It'd be better to close this as a duplicate (or if you can't due to low rep, flag it perhaps). – alex Nov 26 '13 at 05:28
Im sorry, just wanted to help, wont do that again – Hawiak Nov 26 '13 at 05:29
I'm sure your intentions were good. :) – alex Nov 26 '13 at 05:33

score -1 · Accepted Answer · answered Nov 26 '13 at 05:27

-1

use this

function check_whether_json($response){
    if(json_decode($response) != NULL){
        return TRUE;
    }else{
        return FALSE;
    }
}

and CHECK like this

$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';

Now Checking Starts

if(check_whether_json($json)){
// Proceed ur code...
}

answered Nov 26 '13 at 05:27

Mohan Raj

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[`null` is valid JSON](http://codepad.org/p1690dQg). You could also return the results of that condition, I don't believe you gain anything by repeating the return value. – alex Nov 26 '13 at 05:30

Method to Check whether the Response is JSON in PHP?

4 Answers4