eval() works but JSON.parse() and $.parseJSON() doesn't work

Question

I have a string returned from the server in my object property : (R.Message)

    "{
        error:{
            titleName:"||BroadcastableException_Title",
            errorDescriptionName:"||BroadcastableException_Description",
            errorMessageParameters:"",
            message:"\u003cb\u003e\u003ci\u003eBroadcast\u0027s status has been changed \u003c/i\u003e\u003c/b\u003e",
            stackTrace:" XXXX\\XXX.asmx.cs:line 851"
        }
    }"

I can use

(eval('(' + R.Message + ')')

But JSON.parse dosen't work

JSON.parse(R.Message)

I have this error :

Uncaught Invalid JSON: {error: {titleName:"||BroadcastableException_Title",errorDescrip .

Why Eval function can create object from this string but JSOn.parse can't?

I tried $parseJSON and I got the same error.

Because JSON is not synonym for JavaScript. Your string is just not JSON. — Álvaro González, May 31 '16 at 14:30
Possible duplicate of [What are the differences between JSON and JavaScript object?](http://stackoverflow.com/questions/3975859/what-are-the-differences-between-json-and-javascript-object) — Álvaro González, May 31 '16 at 14:31

score 3 · Accepted Answer · answered May 31 '16 at 14:32

3

In JSON, object keys are type "string", and thus need to be quoted. Your keys are unquoted.

Your web browser is kind enough to allow unquoted strings.

answered May 31 '16 at 14:32

You

54
2

moreover, the object keys *must* be quoted using doublequotes – Lud May 31 '16 at 14:42
4 up-votes so far for an answer that suggests that JavaScript/JSON syntax is a matter of browser kindness? ;-P – Álvaro González Jun 01 '16 at 12:28
Alvaro: I can't tell what you're getting at. If you think the score is too low or high, vote. If you don't think my answer is very good, write a better one. – You Jun 04 '16 at 17:38
I'll clarify: both JSON and JavaScript are languages with a clearly defined syntax and, unlike HTML, the browser mustn't attempt to fix and run code that's syntactically wrong but throw a parse error and abort. – Álvaro González Jun 06 '16 at 14:35

eval() works but JSON.parse() and $.parseJSON() doesn't work

1 Answers1