Getting error while Convert string to json object

Question

var result = "";
result += "[";
for(i=0;i<=10;i++)
  {
    result += "{ 'key': 'keyvalue" + i + "', 'values': [";
    for(j=0;j<=10;j++)
      {
        result += "{ 'key': 'subkeyvalue"+j+"', 'value':"+j+"}, ";
      }
    result += "]}, ";
  }

result += "]";

console.log(result);
console.log(JSON.stringify(result));
console.log(JSON.parse(result));

If i try to convert String to JSON.parse. I am getting below error.

JSON.parse: expected property name or '}' at line 1 column 4 of the JSON data

can you please any one resolve this problem.

BTW why you are doing this? As you can do the same with `JSON.stringify` passing JavaScript object; — itzmukeshy7, Oct 19 '16 at 04:55
why you are creating string ? make proper object and add to array and then use JSON.stringify() to make json string — R.K.Saini, Oct 19 '16 at 04:56
@Tushar said **Wrap keys and values in double quotes** not in single; — itzmukeshy7, Oct 19 '16 at 04:58
after converting string to JSON object i need to create chart — G Boomanikandan, Oct 19 '16 at 04:58
you can try something like this. var stringtojson = JSON.stringify(result); — bjesua, Oct 19 '16 at 04:58
Possible duplicate of [Convert string to JSON Object](http://stackoverflow.com/questions/9164944/convert-string-to-json-object) — Udhay Titus, Oct 19 '16 at 05:00
You can pass JavaScript object to charts JavaScript methods no need of encoding and decoding here; — itzmukeshy7, Oct 19 '16 at 05:00
try using the mapping function. a utility lib like [lodash](https://lodash.com/docs) takes a lot of the pain of of stuff like this — , Oct 19 '16 at 05:03
i don't know mapping function. how i will use mapping. i tried JSON.stringify but its not happening. again its showing same string format values — G Boomanikandan, Oct 19 '16 at 05:11

score 1 · Answer 1 · edited Oct 19 '16 at 04:59

1

In this snippet ( result += "]}, ";) , "," (comma) is getting appended at the last, so the json will be like "},]" where you will be expecting like "}]"

edited Oct 19 '16 at 04:59

itzmukeshy7

2,669
1
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answered Oct 19 '16 at 04:58

Surye Prakash

31
2

You should add this in comment as this is not a complete answer; – itzmukeshy7 Oct 19 '16 at 05:04
May be `result += '{ "key": "subkeyvalue'+j+'", "value":'+j+'}, ';` then is this statement is correct? – itzmukeshy7 Oct 19 '16 at 05:07
based on my requirement result is coming. but its coming string format – G Boomanikandan Oct 19 '16 at 05:19

score 0 · Answer 2 · edited Oct 19 '16 at 05:02

0

I think you can use JSON.stringify() or use key and value in (') quote

var result = "";
result += "[";
for(i=0;i<=10;i++)
  {
    result += "{ 'key': 'keyvalue" + i + "', 'values': [";
    for(j=0;j<=10;j++)
      {
        result += "{ 'key': 'subkeyvalue"+j+"', 'value':"+j+"}, ";
      }
    result += "]}, ";
  }

result += "]";

console.log(result);

console.log(JSON.stringify(result));

edited Oct 19 '16 at 05:02

itzmukeshy7

2,669
1
21
29

answered Oct 19 '16 at 05:00

i tried JsON.stringify again it showing same string format result – G Boomanikandan Oct 19 '16 at 05:09

score 0 · Answer 3 · answered Oct 19 '16 at 05:12

Try to use the code given below. You should not append the , (Comma) to the last element while iterating

var result = "";
result += "[";
for(i=0;i<=10;i++)
  {
    result += '{ "key": "keyvalue' + i + '", "values": [';
    for(j=0;j<=10;j++)
      {
        result += '{ "key": "subkeyvalue'+j+'", "value":'+j+'}';
        if(j!=10) {
          result += ','
        }
      }
    result += ']} ';
    if(i!=10) {
     result += ','
    }
  }

result += ']';

console.log(result);

console.log(JSON.parse(result));

score 0 · Accepted Answer · answered Oct 19 '16 at 05:16

Don't create JSON strings manually through string concatenation. Just...don't.

Create an array, create appropriate objects and add them to the array, then pass the array to your charting library as is.

Or if you actually need a JSON string use JSON.stringify() on the array.

And note that there is no such thing as a "JSON object".

var result = [];
var vals;
for(var i=0;i<=10;i++) {
  vals = [];
  for(j=0;j<=10;j++) {
    vals.push( { key: 'subkeyvalue'+j, value: j } );
  }
  result.push( { key: 'keyvalue' + i, values: vals } );
}

// someChartFunction(result);

console.log(result);
console.log(JSON.stringify(result));

Getting error while Convert string to json object

4 Answers4