How to parse a string to array in js

Question

I have an a string like the following,

var x = "[{"k":"1"}]";
console.log(x[0].K);

I ant hange this string sine I am getting from the server.Its out of my control. I want to display the 'k' value and when I onsole it,got

  Uncaught SyntaxError: Unexpected identifier

I know,it beasuse of the 'double quotes' inside and outside of the array.

It is not even allowing me to parse it.

So,I thought

1)Replace "[  and ]" as '[  and ]'  so it becomes

 '[{"k":"1"}]'

2)Then I can parse and get the 'k' value.

var x = "[{"k":"1"}]";
console.log(x.replace(/"[/g," '[ ").replace(/"]"/g," ]'"));

But still I am getting the same unexpeted identifier error,an anyone please suggest me help.Thnaks.

This is JSON, so: Safely turning a JSON string into an object — Felix Kling
– Felix Kling, Commented Jun 13, 2018 at 0:00
Probably just a typo, but you'll need to be case sensitive. .k and .K are two different things. — Ryan Gibbs
– Ryan Gibbs, Commented Jun 13, 2018 at 0:01
"So,I thought...." This cannot work because the browser cannot even execute the code. You are not getting the error for trying to access the property. You are getting it because your code literally contains "[{"k":"1"}]". If you'd tell us how that strings gets into your code we could help you better. Please read How to Ask. — Felix Kling
– Felix Kling, Commented Jun 13, 2018 at 0:04

Christian Scott · Accepted Answer · 2018-06-12 23:59:27Z

7

You're still using double quotes around x.

var x = '[{"k":"1"}]';

Use JSON.parse to turn it into an array:

var array = JSON.parse(x);
console.log(array); // [{ "k": "1" }]

answered Jun 12, 2018 at 23:59

Christian Scott

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2 Comments

Testimg198 Over a year ago

Hi Christian,beause of double quotes its not allowing me to parse.

Felix Kling Over a year ago

@Testimg198: You are providing too little information for us to help you effectively. You cannot have the character sequence "[{"k":"1"}]" in your code. It's just not possible. You have to fix that. But since you are not telling us how that character sequence gets into your code we cannot really help you. You either have to edit the file with your text editor and change the outer double quotes to single quotes, or if the code is generated/embedded somehow, update the process that does that.

Pheonix2105 · Accepted Answer · 2018-06-13 00:27:31Z

3

Does it need to an array of objects containing strings?

It seems you are over complicating it, try

//create a javascript object as x, set the VALUE (1) of KEY (k)
var x = {"k":"1"};
//log the objects k property
console.log(x.k);

Just realised what you are trying to achieve, go with the below answer if you're trying to parse JSON that's echo'd via PHP or something similar.

Example parsing JSON to a javascript array

var jsonData = '[{"name" : "Apple"}, {"name" : "Pear"} ]';

var parsedJson = JSON.parse(jsonData);
console.log(parsedJson[0]);

parsedJson.forEach(function(fruit){
  console.log(fruit.name);
});

edited Jun 13, 2018 at 0:27

answered Jun 12, 2018 at 23:58

Pheonix2105

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1 Comment

Felix Kling Over a year ago

"if you're trying to parse JSON that's echo'd via PHP" Even then it would be better to embed it as an object literal, not as a string.

georgeawg · Accepted Answer · 2018-06-13 00:38:48Z

0

Use String.prototype.slice to strip the outer double quotes from the string returned by the server.

Then use JSON.parse:

var x = `"[{"k":"1"}]"`
var x2 = x.slice(1,-1);
var x3 = JSON.parse(x2);
console.log(x)
console.log(x2);
console.log(x3[0]);
console.log(x3[0].k);

edited Jun 13, 2018 at 0:38

answered Jun 13, 2018 at 0:32

georgeawg

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4 Comments

Testimg198 Over a year ago

Why are the back traes '`' added to the string since I dont have them.

georgeawg Over a year ago

It simulates the string that comes from the server.

Pheonix2105 Over a year ago

I think they meant your use of back ticks instead of single quotes, which is a feature of ECMA6, I believe?

James Wong Over a year ago

I believe the backticks are valid and do not warrant an answer edit. Reference: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…

Nick is tired · Accepted Answer · 2022-04-29 03:44:19Z

0

I've been doing JSON with double quotes and found this solution:

var x = "[{\"k\":\"1\"}]";
var parsedx = JSON.parse(x);
console.log(parsedx[0].k);

By using \" it will cancel those double quotes until it has been parsed.

edited Apr 29, 2022 at 3:44

Nick is tired

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answered Apr 28, 2022 at 22:33

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