JSON.parse: Unexpected character error in Javascript

Question

I am trying to parse a JSON which I will get from Java session variable. I am using code like this:

var foo1 = <%= session.getAttribute("json").toString() %>
var foo = JSON.parse(foo1.toString());
alert(foo.toString());

(Yes, I know scriptlets is Bad, but this is just for temporary). The value which I get with foo1 is a valid JSON (I verified with online validators). But when I try to alert the foo1 I get it as [object,Object] but if I try to parse, I get JSON.parse:Unexcpected character error.

I have uploaded JSON here, in-case if required. Since it is a bit big json string, I cannot post here.

Can someone please help me to know what wrong I am doing in this? To summary I am trying to get JSON String from Java session variable and trying to parse it in Javascript. Any tips on how to do this is appreciated.

rajesh kakawat · Accepted Answer · 2013-11-25 12:03:59Z

1

try something like this

var foo = <%= session.getAttribute("json").toString() %>
alert(foo.toString());

Reason : your are already getting json object so no need to parse.

var obj = {id:1};    // No need to parse
var obj = "{id:1}"; // Need to parse

answered Nov 25, 2013 at 12:03

rajesh kakawat

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4 Comments

Pradeep Simha Over a year ago

So then I can be able to access elements just like it has been parsed? right?

Pradeep Simha Over a year ago

it's again printing me as "[object,Object]"

Pradeep Simha Over a year ago

ok I will do my bit research again and comeback and reply to you, thanks :)

rajesh kakawat Over a year ago

according to me foo is array so try alert(foo[0].toString())

isnot2bad · Accepted Answer · 2013-11-25 12:10:23Z

0

In your case, foo1 is not a string but already a JSON object! That's because you're not assigning a string literal to it, but a javascript-object-structure.

Let's assume the string value of the "json" attribute is { name: "Jack", age: 25 }. Now after JSP processing has been done, the client receives the following:

var foo1 = { name: "Jack", age: 25 }

What you are maybe expecting is:

var foo1 = "{ name: \"Jack\", age: 25 }"

answered Nov 25, 2013 at 12:10

isnot2bad

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