JSON is undefined error in JavaScript in Internet Explorer

Question

We are using jQuery in our application  We have used a jQuery plugin to implement JavaScript session    It is working properly in Firefox and most Internet Explorer 8 browsers    But in some Internet Explorer 8 browsers it does not work  It gives the following error   Message   JSON  is undefined Line  6 Char  3 Code  0   Message     namesession  is null or not an object Line  53 Char  2 Code  0      The version of Internet Explorer in both the cases is same    But there were some differences in Internet Explorer settings like Use SSL3 0 and Enable Smart Screen filters check boxes in the Advanced tab in the Internet options were unchecked    When we checked it  it started working  When we unchecked them it was still working    What is the actual problem in IE8

User · Answer

lt  DOCTYPE html gt    Otherwise IE8 is not acting right  Also you should use    lt meta http-equiv  X-UA-Compatible  content  IE EDGE    gt

User · Answer

Please add json2 js in your project   i was faced the same issue i have fixed   please use the link  https   raw github com douglascrockford JSON-js master json2 js and create new file json js  copy the page and past into newly created file   and move that file into your web application   I hope it will work

User · Answer

I had this error 2 times  Each time it was solved by changing the ajax type  Either GET to POST or POST to GET     ajax           type  GET      or  POST          url   file cfm action get table amp varb     varb

User · Answer

Check for extra commas in your JSON response  If the last element of an array has a comma  this will break in IE

User · Answer

I had the very same problem recently  In my case on the top of a php script I had some code generationg obviously some extra output to the browser  Removal of empty lines  between    and html-tag   and simple cleanup helped me out    lt  php  include     config php         ob clean      gt   lt  DOCTYPE html gt

User · Answer

Change the content type to  application x-www-form-urlencoded

User · Answer

Maybe it is not what you are looking for  but I had a similar problem and i solved it including JSON 2 to my application   https   github com douglascrockford JSON-js  Other browsers natively implements JSON but IE  lt  8  also IE 8 compatibility mode  does not  that s why you need to include it   Here is a related question  JSON on IE6  IE7   UPDATE  the JSON parser has been updated so you should use the new one  http   bestiejs github io json3

[javascript] 'JSON' is undefined error in JavaScript in Internet Explorer

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