Invalid JSON,Unexpected Token

Question

I'm trying to send JSON data to server using angular, But getting JSON.parse error in firefox and Unexpected token in chrome.

It works sometime and throws error sometime.

I consider it is because of the timestamp I'm using to create some keys.

{
    "genericformfieldId": "1",
    "userId": "2",
    "formData": {
        "_1443551400000": [
            {
                "mValue": "HARYANA",
                "type": "DropDown",
                "name": "selectState"
            }
        ],
        "_1443637800000": [
            {
                "mValue": "CHHATTISGARH",
                "type": "DropDown",
                "name": "selectState"
            }
        ],
        "_1443810600000": [
            {
                "mValue": "sac",
                "type": "SingleLineText",
                "name": "departureFrom"
            }
        ]
    }
}

Please suggest.

Adding code for posting data

$http({
    method: 'POST',
    url:    Url, 
    headers: { "Content-Type": "application/json" }, 
    data: formData
    })
.success( function( response, status, headers, config ) {
    console.log( response );
    if( response ) {                    
        deferred.resolve( response );
    }
})
.error( function( response, status, headers, config ) {  
    deferred.reject( null );
});

Ths JSON is always this? Because this is a valid JSON, probably in some cases you are sending an invalid one, — Irvin Dominin, Sep 28 '15 at 06:37
Refer to this question, May be it would be helpful to you. http://stackoverflow.com/questions/18791718/json-parse-unexpected-token-s — CandleCoder, Sep 28 '15 at 06:37
This is valid JSON. can you please put exact error. Parse errors generally comes when you don't put quotes around key or property. like if you use mValue instead of "mValue". — murli2308, Sep 28 '15 at 06:44
@zion can you post an example of the invalid one? And the code to reproduce the issue? — Irvin Dominin, Sep 28 '15 at 06:45
Maybe a stupid question, but if you want to send a JSON to the server - why do you use JSON.parse?? Shouldn't you use JSON.stringify? — Michael, Sep 28 '15 at 06:51
sorry for a late response.. there seems to be no issue with the data.. May be with the code.. — zion, Sep 28 '15 at 06:56
use ` (backtick) for wrapping all this is in a multiline string — caub, Sep 28 '15 at 07:01
Look, maybe this is the answer for your problem: http://stackoverflow.com/questions/17211443/change-content-type-to-application-json-post-method-restful-api — Maciej Osytek, Sep 28 '15 at 08:30

score 1 · Answer 1 · edited May 23 '17 at 10:27

If you JSON.parse an object the "Unexpected token o" is thrown simply because you are trying to parse object.toString(), which is [object Object]. Try to JSON.parse('[object Object]'); ;)

This should work for you

var data = '{
    "genericformfieldId": "1",
    "userId": "2",
    "formData": {
        "_1443551400000": [
            {
                "mValue": "HARYANA",
                "type": "DropDown",
                "name": "selectState"
            }
        ],
        "_1443637800000": [
            {
                "mValue": "CHHATTISGARH",
                "type": "DropDown",
                "name": "selectState"
            }
        ],
        "_1443810600000": [
            {
                "mValue": "sac",
                "type": "SingleLineText",
                "name": "departureFrom"
            }
        ]
    }
}';
JSON.parse(data);

This answer https://stackoverflow.com/a/12719860/1868660 explains Unexpected token ILLEGAL(…) issue

This answer http://stackoverflow.com/a/12719860/1868660 explains Unexpected token ILLEGAL(…) issue — Subodh Ghulaxe, Sep 28 '15 at 07:01

score 0 · Answer 2 · edited Sep 28 '15 at 16:52

0

You must clean input json.

Check this:

https://jsfiddle.net/am190cv5/

Here's the source:

var s = '{"genericformfieldId": "1","userId": "2","formData": {"_1443551400000": [{"mValue": "HARYANA","type": "DropDown","name": "selectState"}],"_1443637800000": [{"mValue": "CHHATTISGARH","type": "DropDown","name": "selectState"}],"_1443810600000": [{"mValue": "sac","type": "SingleLineText","name": "departureFrom"}]}}';

var result = JSON.parse(s);
console.log(result);

Open the console and look the result.

edited Sep 28 '15 at 16:52

MrEngineer13

38,642
13
74
93

answered Sep 28 '15 at 07:04

Maciej Osytek

36
1
4

"clean"? What does it exactly mean? – zerkms Sep 28 '15 at 07:16
I mean unformatted - without \r\n. In this case it works correctly: var result = JSON.parse(s); console.log(result); – Maciej Osytek Sep 28 '15 at 08:24
It would work even with new lines. New lines is a valid JSON character. – zerkms Sep 28 '15 at 08:24

Invalid JSON,Unexpected Token

2 Answers2