Converting a string to JSON object

Question

How do you make JS think that a string is JSON ?

I have a function which only works if JSON object is passed to it. If I pass a string to it, with same format as JSON, it doesn't work. So I want to make that function think that the string passed to it is a JSON. The string is indeed in the JSON format.

I also tried the following. I inputted the string through Ajax , with "handle as" parameter as "JSON", and then when I passed the result to the function it works.

So I deduced the problem is not with the string. How do I convert this string to JSON? If i get same string through ajax request and then passing it to function works, whereas directly passing it doesn't work.

The string is as follows:

  {
     "data": [
   {
  "id": "id1",
      "fields": [
        {
          "id": "name1",
          "label": "joker",
          "unit": "year"
        },
         {"id": "name2", "label": "Quantity"},
    ],
      "rows": [    data here....

and closing braces..

possible duplicate of Safely turning a JSON string into an object — Manse
– Manse, Commented Jun 11, 2012 at 8:55
Your title is misleading. Based on the content of your question I'd rather say you want to convert a string containing JSON into a JavaScript object/array. — Felix Kling
– Felix Kling, Commented Jun 11, 2012 at 9:04
OK i solved it. There was a \n in the string. Now only have to figure out how to use JSON.parse with this. — Zer0
– Zer0, Commented Jun 12, 2012 at 11:59
Ok i fixed it. Goto jsonlint.com and put your string there. If it says its correct, then you can use JSONParse to achieve the same. — Zer0
– Zer0, Commented Jun 14, 2012 at 5:34
In case anyone reads this, the title is supposed to be "converting a JSON string into an object" — user5734311
– user5734311, Commented Dec 4, 2019 at 9:27

Durandal · Accepted Answer · 2014-03-08 16:35:00Z

424

var obj = JSON.parse(string);

Where string is your json string.

edited Mar 8, 2014 at 16:35

Durandal

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answered Jun 11, 2012 at 8:51

Kshitij

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7 Comments

Zer0 Over a year ago

This is not working. It is throwing an error "SyntaxError: JSON.parse: unexpected character" . There is nothing wrong with the string as when i get the same string through a ajax request and handle it as "JSON", no problem occurs.

Kshitij Over a year ago

please post your acutal JSON string

Kshitij Over a year ago

{ "data": [ { id": - you are missing a double quote here, i.e. starting double quote of id

Zer0 Over a year ago

When I get it through Ajax it works as then it handles the response as JSON . So I think I have to convert this to a JSON object..

Zer0 Over a year ago

I ended up going to jsonlint.com, and making sure my Json is right

|

Sarfraz · Accepted Answer · 2012-06-11 08:50:22Z

28

You can use the JSON.parse() for that.

See docs at MDN

Example:

var myObj = JSON.parse('{"p": 5}');
console.log(myObj);

answered Jun 11, 2012 at 8:50

Sarfraz

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3 Comments

Zer0 Over a year ago

This is not working. It is throwing an error "SyntaxError: JSON.parse: unexpected character" . There is nothing wrong with the string as when i get the same string through a ajax request and handle it as "JSON", no problem occurs.

Sarfraz Over a year ago

@Zer0: You should update your question with how you are trying it along with your json string.

Felix Kling Over a year ago

@Zer0: We can only answer to the best of our knowledge. You say you have a JSON string, we answer accordingly. It seems your string is different, if you'd post it, we can answer taking this into account. If you ask a question about coding, then code/data is indispensable .

Dave Anderson · Accepted Answer · 2019-09-24 05:01:40Z

9

I had the same problem with a similar string like yours

{id:1,field1:"someField"},{id:2,field1:"someOtherField"}

The problem here is the structure of the string. The json parser wasn't recognizing that it needs to create 2 objects in this case. So what I did is kind of silly, I just re-structured my string and added the [] with this the parser recognized

var myString = {id:1,field1:"someField"},{id:2,field1:"someOtherField"}
myString = '[' + myString +']'
var json = $.parseJSON(myString)

Hope it helps,

If anyone has a more elegant approach please share.

edited Sep 24, 2019 at 5:01

Dave Anderson

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answered Jan 17, 2014 at 0:51

Abraham

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2 Comments

James Eberhardt Over a year ago

In your code above, you've constructed myString incorrectly. It's not a string, and it's incorrectly formatted JSON. Your second line would then become redundant. Here's what it should be: var myString = '[{"id":1,"field1":"someField"},{"id":2,"field1":"someOtherField"}]' I know this is quite an old post, but I thought I'd add some clarity in case anyone finds it.

brasofilo Over a year ago

I solved my issue using $.parseJSON where JSON.parse was not working and throwing an error JSON.parse is not a function

sandeep patel · Accepted Answer · 2012-06-11 08:52:27Z

5

var obj = jQuery.parseJSON('{"name":"John"}');
alert( obj.name === "John" );

link:-

http://api.jquery.com/jQuery.parseJSON/

answered Jun 11, 2012 at 8:52

sandeep patel

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Comments

Siyavash Hamdi · Accepted Answer · 2017-10-15 06:44:43Z

4

Simply use eval function.

var myJson = eval(theJsibStr);

answered Oct 15, 2017 at 6:44

Siyavash Hamdi

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1 Comment

dparker Over a year ago

eval is evil, be very careful to security with this approach

Sugan V · Accepted Answer · 2019-09-03 06:14:01Z

4

convert the string to HashMap using Object Mapper ...

new ObjectMapper().readValue(string, Map.class);

Internally Map will behave as JSON Object

answered Sep 3, 2019 at 6:14

Sugan V

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Comments

Alexei - check Codidact · Accepted Answer · 2017-04-03 06:25:00Z

2

var Data=[{"id": "name2", "label": "Quantity"}]

Pass the string variable into Json parse :

Objdata= Json.parse(Data);

edited Apr 3, 2017 at 6:25

Alexei - check Codidact

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answered Apr 3, 2017 at 5:49

Ankita_Shrivastava

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1 Comment

James Eberhardt Over a year ago

In your example, Data is already an object, so there would be no need to parse it. You would need some quotes surrounding all your Data in order to make it a string.

Shishir · Accepted Answer · 2018-05-29 12:20:48Z

Let's us consider you have string like

example : "name:lucy,age:21,gender:female"

function getJsonData(query){
    let arrayOfKeyValues = query.split(',');
    let modifiedArray =  new Array();
    console.log(arrayOfKeyValues);
    for(let i=0;i< arrayOfKeyValues.length;i++){
        let arrayValues = arrayOfKeyValues[i].split(':');
        let arrayString ='"'+arrayValues[0]+'"'+':'+'"'+arrayValues[1]+'"';
        modifiedArray.push(arrayString);
    }
    let jsonDataString = '{'+modifiedArray.toString()+'}';
    let jsonData = JSON.parse(jsonDataString);
    console.log(jsonData);
    console.log(typeof jsonData);
    return jsonData;
}

let query = "name:lucy,age:21,gender:female";
let response = getJsonData(query);
console.log(response);

`

ridwan rf · Accepted Answer · 2022-07-07 01:23:18Z

2

JSON.parse() is your friend. Here's an example:

let obj = JSON.parse(yourString)
console.log(typeof obj); // prints 'object' assuming your string is correctly formatted

answered Jul 7, 2022 at 1:23

ridwan rf

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Comments

Prasad Khode · Accepted Answer · 2017-02-03 08:23:47Z

1

JSON.parse() function will do.

or

Using Jquery,

var obj = jQuery.parseJSON( '{ "name": "Vinod" }' );
alert( obj.name === "Vinod" );

edited Feb 3, 2017 at 8:23

Prasad Khode

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answered Feb 3, 2017 at 8:06

Vinod Selvin

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