SyntaxError: JSON Parse error: Unexpected identifier "object" (anonymous function)

Question

I do not understand what went wrong when parsing file:

{ "t": -9.30, "p": 728.11, "h": 87.10 }

javascript code:

<script type="text/javascript">
function check() {
    $.get("http://....file.json", function(response, status, xhr) {
        if (status == "success") {
            var json = JSON.parse(response);
            $("#temp").html(json.t + "&deg;");
            $("#pressure").html(json.p + " mm hg");
        }
        if (status == "error") {
            $("#temp").html("error");
        }
    });
}

I receive error:

SyntaxError: JSON Parse error: Unexpected identifier "object"

console.log(response); ?

Paul Rad
– Paul Rad

2013-12-18 14:11:41 +00:00
Commented Dec 18, 2013 at 14:11 — Paul Rad
– Paul Rad, Commented Dec 18, 2013 at 14:11
you don't need to parse

Anand Jha
– Anand Jha

2013-12-18 14:11:45 +00:00
Commented Dec 18, 2013 at 14:11 — Anand Jha
– Anand Jha, Commented Dec 18, 2013 at 14:11
You already have an object, no need to parse it.

vidur punj
– vidur punj

2018-05-12 16:06:03 +00:00
Commented May 12, 2018 at 16:06 — vidur punj
– vidur punj, Commented May 12, 2018 at 16:06

VisioN · Accepted Answer · 2013-12-18 14:11:12Z

76

Most probably your response is already a JavaScript object and it not required to be parsed.

Remove the line var json = JSON.parse(response); and your code should work.

answered Dec 18, 2013 at 14:11

VisioN

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1 Comment

epascarello Over a year ago

Than make a check if it is an object or use $.ajax and tell it what it is supposed to be....

apsillers · Accepted Answer · 2013-12-18 14:21:42Z

13

According to the jQuery docs on $.ajax (which is what $.get uses internally):

dataType: ...If none is specified, jQuery will try to infer it based on the MIME type of the response (an XML MIME type will yield XML, in 1.4 JSON will yield a JavaScript object...)

Thus, your response is likely already an object. When you do JSON.parse(response), you're really doing

JSON.parse("[object Object]")

because JSON.parse coerces its argument to a string, and plain objects by default stringify to [object Object]. The initial [ leads JSON.parse to expect an array, but it then chokes on the object token, which does not fit the JSON grammar.

Remove the JSON.parse line, because response is already parsed into an object by jQuery.

edited Dec 18, 2013 at 14:21

answered Dec 18, 2013 at 14:16

apsillers

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