Trying to parse json source with javascript

Question

I am trying to parse json source with javascript.

I have this json source:

var exam = '{
    status : 'connected',
    authResponse: {
    accessToken: 'it is accessToken',
    expiresIn:'2014-06-19',
    signedRequest:'it is signedRequest',
    userID:'mp172'
    }
}';

To parse, I use JSON.parse(exam);

After this source, it is not working. I want to parse this source with javascript.

While JSON and javascript object literal syntax look similar they're not the same. For example you cannot have functions in JSON, you must quote strings with `"` etc. See JSON.org for the specification of the JSON format. — slebetman, Jun 18 '14 at 04:01
ate you sure you are getting that response as a JSON source @user3750753 — Runcorn, Jun 18 '14 at 04:04

score 1 · Answer 1 · answered Jun 18 '14 at 03:58

1

Actually, your json source is not valid. According to JSON.org, member should be quote by "

Change exam to {"status":"connected","authResponse":{"accessToken":"it is accessToken","expiresIn":"2014-06-19","signedRequest":"it is signedRequest","userID":"mp172"}}

answered Jun 18 '14 at 03:58

comphilip

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Thank you answering my question, actually it is provided from facebook. i can't edit this source. and i am testing facebook development now. i know the syntax... please help me. – user3750753 Jun 18 '14 at 04:01
So the source returned by facebook is not for JSON parser, but javascript. Try `eval('return ' + exam);` – comphilip Jun 18 '14 at 04:04
Sorry for my eval is wrong. Use `eval("var exam={status:'connected',authResponse:{accessToken:'it is accessToken',expiresIn:'2014-06-19',signedRequest:'it is signedRequest',userID:'mp172'}}")` – comphilip Jun 18 '14 at 04:19

nyzm · Answer 2 · 2014-06-18T04:24:51.707

1

Take a look at JSON.stringify and JSON.parse.

var exam = {status : 'connected', authResponse: { accessToken: 'it is accessToken', expiresIn:'2014-06-19', signedRequest:'it is signedRequest', userID:'mp172' }};
// stringify the response first
stringify = JSON.stringify(exam);
// stringified result
console.log(stringify);
// parse the json
final = JSON.parse(stringify);
// parsed final result
console.log(final);

Here is the jsfiddle example

edited Jun 18 '14 at 04:24

answered Jun 18 '14 at 04:06

nyzm

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why do you need to stringify it since it was already a string to start with? – Farax Jun 18 '14 at 04:07
2

@Farax looks like he is getting a javascript object as response. since its not a valid json, thats why I stringify first. – nyzm Jun 18 '14 at 04:10
stringify would not make it a valid JSON object – Farax Jun 18 '14 at 04:14
@Farax stringify will add double quotes to make it valid JSON. you can try on jsfiddle I gave above. – nyzm Jun 18 '14 at 04:20
1

The jsFiddle example doesn't match with the code you have in your answer. – Felix Kling Jun 18 '14 at 04:20
1

@FelixKling Now it does :) – nyzm Jun 18 '14 at 04:25

score 0 · Answer 3 · answered Jun 18 '14 at 04:00

Your JSON is invalid , it should look something like this ,

{
    "status": "connected",
    "authResponse": {
        "accessToken": "itisaccessToken",
        "expiresIn": "2014-06-19",
        "signedRequest": "itissignedRequest",
        "userID": "mp172"
    }
}

JSONLint show following error ,

enter image description here

score 0 · Answer 4 · answered Jun 18 '14 at 04:03

"Proper" json data has both the property name and string values in double quotes. Browser parsers are very lenient though and the reason I think yours is failing is because it isn't a valid string. When you open the string with ', the string ends on the next ' it finds, so it should be choking when it tries to make sense of connected', after finding the string '{ status : '. If you wrapped your JSON in single double quotes (since it uses single quotes for values) that would probably work, but comphilip is right.

Farax · Answer 5 · 2014-06-18T04:10:20.103

0

If you intended it to be a string to start with, make sure it is in one line. Otherwise, use (+) to append the string and then use JSON.parse to parse it to an object.

  var exam = '{"status" : "connected","authResponse": {"accessToken": "it is accessToken","expiresIn":"2014-06-19","signedRequest":"it is signedRequest","userID":"mp172"}}'


  var obj = JSON.parse(exam);

Chrome developer tool

edited Jun 18 '14 at 04:10

answered Jun 18 '14 at 04:05

Farax

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Trying to parse json source with javascript

5 Answers5