Why JSON.stringify giving JSON undefined error?

Question

I am trying to use JSON.stringify in my javascript page (EXTJS) code but it's giving me JSON is undefined error. Error happends only in IE (ver.10). This code will work in FF and Chrome. Below is a sample code that I am trying to use. Why is it failing? This seems like a valid example and works in other browsers. Thanks in advance.

var contact = new Object(); 
contact.firstname = "Joe";
contact.surname = "Smith";
contact.gendere= "male";
var jsonText = JSON.stringify(contact);

What happens when you use {} instead of new Object()? Does it work if you use a hardcoded object like { firstname : 'Joe', surname : 'Smith', gendere : 'male' }? — schlingel
– schlingel, Commented Jun 18, 2013 at 16:01
Hi schlingel, I get same error "JSON undefined" when I hard code. — JS11
– JS11, Commented Jun 18, 2013 at 16:12

SheetJS · Accepted Answer · 2013-06-18 15:44:17Z

2

Use <!DOCTYPE html> if you only need to support IE10. If you need to use earlier versions of IE (some people still need to support IE6) you can use the JS implementation of JSON: https://github.com/douglascrockford/JSON-js

answered Jun 18, 2013 at 15:44

SheetJS

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7 Comments

JS11 Over a year ago

Ok I tried <!DOCTYPE html> but no effect, same problem, JSON undetified error. Any other ideas?

SheetJS Over a year ago

@JS11 did you try using the JSON-js implementation from my response?

JS11 Over a year ago

Hi Nirk, I am currently using json2.js and i notice this on the link you recomended: "json.js: This file does everything that json2.js does. It also adds a toJSONString method and a parseJSON method to Object.prototype. Use of this file is not recommended."

JS11 Over a year ago

Use of this file is not recommended - portion is what confuses me

SheetJS Over a year ago

@JS11 use the file json2.js -- that replicates the JSON object (with parse and stringify). json.js was an older interface

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Denys Séguret · Accepted Answer · 2013-06-18 15:42:34Z

2

Put

<!DOCTYPE html>

at the top of your document (and of course remove any other doctype you might have).

Without it, IE10 is in a weird compatibility mode where many "new" features aren't available, for example JSON.

answered Jun 18, 2013 at 15:42

Denys Séguret

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3 Comments

Jeremy J Starcher Over a year ago

This is truth,and if you are doing new development, the only solution. HOWEVER, if you are maintaining and old page that relies on the broken layout, you can include json.js from the json.org website.

Denys Séguret Over a year ago

@JeremyJStarcher That's true. But do people still maintain applications compatible with IE8 and not compatible with other browsers ?

Jeremy J Starcher Over a year ago

Not so much on public facing websites, but there are still a lot of intraweb and private websites that have not been brought up to date. A lot are limited to older IE engines to do ActiveX dependencies.

dbrin · Accepted Answer · 2013-06-18 16:43:18Z

2

You have the framework already, use it: Ext.JSON.encode/decode http://docs.sencha.com/extjs/4.1.3/#!/api/Ext.JSON

answered Jun 18, 2013 at 16:43

dbrin

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