Firefox can't parse JSON string in jQuery AJAX response

Question

I am experiencing a strange problem while trying to parse JSON strings in jQuery AJAX response. Here is my code:

$.ajax({
    type: "POST",
    url: "Save",
    data: {
        expiry: expiry,
        settings: settings
    }
}).done(function (msg) {
    alert(msg);
    var obj = jQuery.parseJSON(msg);
    if (obj.status == "done") {
        window.location = obj.redirect;
    }
});

On IE, Chrome, and Safari, I am getting JSON string in alert, but on Firefox, I am getting

[obj XMLDocument]

in the alert.

Here is FF console:

enter image description here

obj is null, but I can see the response JSON string in the console under text attribute

responses=Object { xml=document, text="{"status":"done","redir...ippetImage\/s\/6abb68"}

Any reason for this behavior?

JAVAGeek · Accepted Answer · 2012-07-09 20:54:51Z

5

Problem was on servlet side. I had to set contentType to make it work.

response.setContentType("text/JSON");

answered Jul 9, 2012 at 20:54

JAVAGeek

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Comments

Marc B · Accepted Answer · 2012-07-09 20:06:08Z

1

That's not a valid JSON string. A JSON string is, for all intents and purposes, simply the right-hand side of an assignment in JS.

e.g.

var x = 7;
        ^
var y = [1,2,3];
        ^^^^^^^
var z = {a:'b', c: 'd'};
        ^^^^^^^^^^^^^^^

The parts indicated by ^ correspond to what you'd get if you converted the x/y/z vars to JSON strings.

If you can't write your json string as a JS assignment, e.g.

var x = ...json_string_here...;

then it's not valid JSON. Your snippet boils down to:

var x = responses=Object { .... }

which is a syntax error.

answered Jul 9, 2012 at 20:06

Marc B

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3 Comments

WhyNotHugo Over a year ago

Coincidence probably. The fact that it works on other browsers doesn mean it's proper JSoN.

JAVAGeek Over a year ago

{"status":"done","redirect":"some_url"} is their any problem with this json string ?

Kara Brightwell Over a year ago

response=Object {...} is Firebug's way of printing an object. You have misapprehended the question (and also the JSON spec: {a:'b', c: 'd'} is not valid JSON, {"a":"b", "c": "d"} is)

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