JSON.stringify and JSON.parse not working in IE9?

Question

I'm using JSON.Stringify and JSON.parse everywhere and it works fine with Firefox. It's working no more with IE9 nor does it work in IE8. What can I do?

see more here how make it with IE 8 http://stackoverflow.com/questions/3326893/json-stringify-supported-by-ie-8/10940623#10940623 — ggc, Jun 07 '12 at 22:20
see more here http://stackoverflow.com/questions/3326893/json-stringify-supported-by-ie-8/10940623#10940623 — ggc, Jun 07 '12 at 22:21

score 35 · Answer 1 · edited May 23 '17 at 12:33

35

JSON.stringify starts with a lower-case s. Both stringify and parse are available in IE8+, but only in standards mode.

Prepend your document with <!DOCTYPE html> if you're currently using quirks mode. Also, watch the capitalization of the JavaScript methods you call - all built-in ones start with a lower-case character.

edited May 23 '17 at 12:33

Community

1
1

answered Aug 22 '11 at 10:54

phihag

278,196
72
453
469

6

In addition, watch out if you're developing locally against a localhost address. A Windows Update to IE9 a few weeks ago caused it to begin automatically using compatibility mode for some localhost addresses, which can result in JSON.parse/stringify suddenly not being available even when your markup shouldn't have triggered quirks mode. – Dave Ward Aug 22 '11 at 14:40
i have something already like – saurabh ranu Aug 23 '11 at 06:34

score 11 · Accepted Answer · answered Aug 22 '11 at 14:31

11

why do you want to depend on the browser having the object instead just include the script file by Douglas Crockford.. You can find the minifed file here: http://www.json.org/js.html

Once imported you dont have to worry abt the method existing in a browser.

answered Aug 22 '11 at 14:31

Baz1nga

15,485
3
35
61

Looks better idea to me but which file i should add. There are a lot of files https://github.com/douglascrockford/JSON-js – saurabh ranu Aug 22 '11 at 19:03
Use json2.js. That's the latest one.. Get the minified 1 if u can – Baz1nga Aug 22 '11 at 19:05
Nothing special just a file with no spaces returns and minified variable names etc to reduce the file size.. Google bat us minification and u will find what it is.. If thud minified file isnt there pickup json2.js and u can think of minifying it if u want later – Baz1nga Aug 22 '11 at 19:12
When I started using `JSON.stringify` I was surprised to find it built into the browser (Firefox) even though I was sure it wouldn't work in IE8. I **forgot** to test in IE8 and sure enough, my app didn't work once I tried it there. Thanks for the helpful solution! – blong Sep 16 '11 at 18:04
4

I would suggest to load json.org conditionally only if browser does not support JSON object navively by checking if window.JSON is defined. Otherwise you increase an number of downloaded JS files – Maksym Kozlenko Aug 31 '12 at 07:19
Might the json2.js run slower than what is natively supported in IE10 as well? (another reason to conditionally load it, rather than always loading?) – Jason Parker Jul 08 '13 at 18:51

score 0 · Answer 3 · answered Jun 20 '15 at 12:28

For an alternative, in a scenario where you might need to run in strict mode for whatever reason (I have another library that includes "use strict"), you can look here: https://github.com/douglascrockford/JSON-js. I modified this to check first if JSON is undefined, and only generate the function JSON.parse if it is:

if (typeof JSON === "undefined") {
    var JSON = {
        parse: <insert value of json_parse from library here>
    };
}

My issue was application code not working in IE9 (strict mode being used by a participating library, I believe). That solved the problem for me.

score 0 · Answer 4 · answered Jun 21 '15 at 01:44

the mere issue is, that sending UTF-8 headers will invalidate the JSON (IE doesn't/didn't like that). as the issue is described, that might still apply for IE9... once wrote a how to, a few years ago. adding JSON support to a browser which can parse native JSON is probably not the optimal solution, since it produces useless overhead - only because failing to deliver the JSON in the expected format.

JSON.stringify and JSON.parse not working in IE9?

4 Answers4

Linked