CODEWITHSUNDEEP
phpjqueryajaxapachejson
Tim
Tim

Reputation:

JSON object max size?

Using jquery, I'm able to send json objects from client to server using ajax like this:

var strJSON = '{"event":[{
    "dates":[
        "2009-10-14","2009-10-15"],
   "teams":[
        {"id":"0","country":"USA","state":"CA","name":"California Polytechnic State University","subteam":""},
        {"id":"1","country":"USA","state":"CA","name":"California State University, Bakersfield","subteam":""},
        {"id":"2","country":"USA","state":"CA","name":"California State University, Fresno","subteam":""},
        {"id":"3","country":"USA","state":"CA","name":"California State University, Fullerton","subteam":""}]
}]}';

$.ajax({
    url: '../ajax/save_event',
    type: 'POST',
    data: { data : strJSON },
    dataType: 'json',
    timeout: 8000,
    cache: false
});

It works well. But if the JSON string gets much bigger (not sure the exact size, but somewhere around 5x bigger), the $_POST data received by the server is empty. Anybody know why?

I'm using Apache/PHP/jquery. It happens from both IE and Firefox. Is there a config setting somewhere I need to adjust?

Here's an example of a string that fails to make it through:

{"events":[{"dates":["2009-10-10","2009-10-11","2009-10-12"],"divisions":[{"level":"Collegiate","name":"Varsity","subdivision":"Division I","rounds":[],"teams":[{"id":"0","country":"USA","state":"CA","name":"California Polytechnic State University","subteam":""},{"id":"1","country":"USA","state":"CA","name":"California State University, Bakersfield","subteam":""},{"id":"2","country":"USA","state":"CA","name":"California State University, Fresno","subteam":""},{"id":"3","country":"USA","state":"CA","name":"California State University, Fullerton","subteam":""},{"id":"4","country":"USA","state":"CA","name":"Stanford University","subteam":""},{"id":"5","country":"USA","state":"CA","name":"University of California, Davis","subteam":""},{"id":"6","country":"USA","state":"CA","name":"San Francisco State University","subteam":""},{"id":"7","country":"USA","state":"CA","name":"Lassen Community College","subteam":""},{"id":"8","country":"USA","state":"CA","name":"Menlo College","subteam":""},{"id":"9","country":"USA","state":"CA","name":"Fresno Pacific University","subteam":""},{"id":"10","country":"USA","state":"CA","name":"Bakersfield","subteam":""},{"id":"11","country":"USA","state":"CA","name":"Buchanan","subteam":""},{"id":"12","country":"USA","state":"CA","name":"Campolindo-Moraga","subteam":""},{"id":"13","country":"USA","state":"CA","name":"Fremont-Sunnyvale","subteam":""},{"id":"14","country":"USA","state":"CA","name":"Ponderosa-Shingle Springs","subteam":""},{"id":"15","country":"USA","state":"CA","name":"West Covina","subteam":""},{"id":"16","country":"USA","state":"CA","name":"Gilroy","subteam":""},{"id":"17","country":"USA","state":"CA","name":"San José State University","subteam":""},{"id":"18","country":"USA","state":"CA","name":"University of California, Los Angeles","subteam":""},{"id":"19","country":"USA","state":"CA","name":"Sierra College","subteam":""},{"id":"20","country":"USA","state":"CA","name":"Selma","subteam":""},{"id":"21","country":"USA","state":"CA","name":"Liberty","subteam":""}],}]}]}

It's created using json.org's "stringify":

var strJSON = JSON.stringify(oEvent);

EDIT: Investigating further, I changed the dataType to "text" and tried sending a long string of numbers. It works up until ~3500 characters then chokes (and when I say "choke" I mean that the request arrives at the server with a null $_POST.)

My PHP post_max_size is 64M, so that's not it. Someone suggested using Apache's "LimitRequestBody" which wasn't in httpd.conf, so I added "LimitRequestBody 0" to it and rebooted Apache. That didn't help either.

Any other suggestions???

Upvotes: 16

Views: 36652

Answers (4)

intellitecture
intellitecture

Reputation: 11

'jsonp' datatype does not and can not use the POST method. Instead all data is passed in a query string. Thus, if the server's max query string length is exceeded, the data will not be passed. The reason for this is that jQuery loads the json data as a node into your html document, and this can only be done as a GET. If you need more data you'll have to use XML or other.

Upvotes: 1

leighghunt
leighghunt

Reputation: 426

Just a couple of pointers to anyone else who finds this page - I ran into a similar issue with a JSON string failing to be parsed using jQuery.parseJSON().

I'm embarrassed to say my issue (probably unrelated to OP's issue) was actually caused by a stray single quote. Escaping it resolved the issue. I had orginally thought it was string length related, as it only seemed to be happening with an 8,000 character long JSON string, but it was the stray quote terminating the string in the wrong place.

Tim, I don't know if you ever got to the bottom of your original issue, but pasting the string you supplied:

{"events":[{"dates":["2009-10-10","2009-10-11","2009-10-12"],"divisions":[{"level":"Collegiate","name":"Varsity","subdivision":"Division I","rounds":[],"teams":[{"id":"0","country":"USA","state":"CA","name":"California Polytechnic State University","subteam":""},{"id":"1","country":"USA","state":"CA","name":"California State University, Bakersfield","subteam":""},{"id":"2","country":"USA","state":"CA","name":"California State University, Fresno","subteam":""},{"id":"3","country":"USA","state":"CA","name":"California State University, Fullerton","subteam":""},{"id":"4","country":"USA","state":"CA","name":"Stanford University","subteam":""},{"id":"5","country":"USA","state":"CA","name":"University of California, Davis","subteam":""},{"id":"6","country":"USA","state":"CA","name":"San Francisco State University","subteam":""},{"id":"7","country":"USA","state":"CA","name":"Lassen Community College","subteam":""},{"id":"8","country":"USA","state":"CA","name":"Menlo College","subteam":""},{"id":"9","country":"USA","state":"CA","name":"Fresno Pacific University","subteam":""},{"id":"10","country":"USA","state":"CA","name":"Bakersfield","subteam":""},{"id":"11","country":"USA","state":"CA","name":"Buchanan","subteam":""},{"id":"12","country":"USA","state":"CA","name":"Campolindo-Moraga","subteam":""},{"id":"13","country":"USA","state":"CA","name":"Fremont-Sunnyvale","subteam":""},{"id":"14","country":"USA","state":"CA","name":"Ponderosa-Shingle Springs","subteam":""},{"id":"15","country":"USA","state":"CA","name":"West Covina","subteam":""},{"id":"16","country":"USA","state":"CA","name":"Gilroy","subteam":""},{"id":"17","country":"USA","state":"CA","name":"San José State University","subteam":""},{"id":"18","country":"USA","state":"CA","name":"University of California, Los Angeles","subteam":""},{"id":"19","country":"USA","state":"CA","name":"Sierra College","subteam":""},{"id":"20","country":"USA","state":"CA","name":"Selma","subteam":""},{"id":"21","country":"USA","state":"CA","name":"Liberty","subteam":""}],}]}]}

into http://json.parser.online.fr/ gives the following error, if this is of any help to anyone else:

SyntaxError: JSON.parse: expected double-quoted property name

Upvotes: 3

Ronald Conco
Ronald Conco

Reputation: 845

It seems like there is a size issue, when testing my Json string everything works when the string is small ,when I increment the string (php array to be encoded) the output of the Json string gets chopped off.

when doing a string length on the failed string , I get (7796) . So I changed the max post option in the ini file both for the cli and apache to 64M instead of 8M and I am still getting the same problem. I do not think this problem is restricted to the apache LimitRequestBody since the php gives the same output on CLI.

One more thing, when doing a var_dump on the encoded json string, I can see when it gets chopped of and the json tags do not get closed, hence why the Json decoder return a null.

e.g 

$strJson = file_get_contents('http://mydomain/page');
var_dump($strJson);

You will see where the string is being chopped off and a zero is concatenated to end of the output.

Upvotes: 2

pix0r
pix0r

Reputation: 31280

This is probably due to your server's configuration. Check php.ini for the setting max_post_size and ensure that it is sufficiently large to post your data. Also check your web server settings - Apache has a LimitRequestBody directive which could be causing your problem. Finally, check your web server and PHP error logs to see if the large post is triggering any errors.

Upvotes: 6

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