convert a string to json object javascript - Stack Overflow

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I know that json.stringify() function converts a json object to json string.

json.stringify({x:9})

this will return string "{"x" : 9}"

But is there a way to convert a simple string into json format? For example i want this

var str = '{x: 9}'
json.stringify(str)  //"{"x" : 9}"

I know that json.stringify() function converts a json object to json string.

json.stringify({x:9})

this will return string "{"x" : 9}"

But is there a way to convert a simple string into json format? For example i want this

var str = '{x: 9}'
json.stringify(str)  //"{"x" : 9}"

• javascript
• json
• stringify

Share Improve this question Follow asked Mar 29, 2016 at 9:36 Maira MuneerMaira Muneer 7511 gold badge22 silver badges77 bronze badges 1

• 1 var str = '{"x": 9}'; var obj= JSON.parse(str) – Rajaprabhu Aravindasamy Commented Mar 29, 2016 at 9:37

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3 Answers 3

Sorted by: Reset to default 3

With a proper format of string, you can use JSON.parse.

var str = '{"x" : 9}',
    obj = JSON.parse(str);

document.write('<pre>' + JSON.stringify(obj, 0, 4) + '</pre>');            

If you are using jQuery then you can use $.parseJSON See http://api.jquery./jquery.parsejson/

Can also visit Parse JSON in JavaScript?

First solution using eval:

const parseRelaxedJSON = (str) => eval('(_ => (' + str + '))()')
JSON.stringify(parseRelaxedJSON('{x: 5}'))

(_ => (' + str + '))() is a self-executing anonymous function. It is necessary for eval to evaluate strings similar to {x: 5}. This way eval will be evaluating the expression function (_ => ({x: 5}))() which if you're not familiar with ES6 syntax is equivalent to:

(function() {
  return {x: 5}
})()

Second solution: using a proper 'relaxed' JSON parser like JSON5

JSON.stringify(JSON5.parse('{x: 2}'))

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