How can I split a string containing n concatenated json string in javascript/nodejs?

Question

Let's say I receive this string from a socket server (which I cannot control):

{"data":{"time":"2016-08-08T15:13:19.605234Z","x":20,"y":30}}{"data":{"time":"2016-08-08T15:13:19.609522Z","x":30,"y":40}}

I cannot use JSON.parse since it contains 2 Json string so how can I split into

var jsonString1 = {"data":{"time":"2016-08-08T15:13:19.605234Z","x":20,"y":30}}

and

var jsonString2 = {"data":{"time":"2016-08-08T15:13:19.609522Z","x":30,"y":40}}

Note: I may have 1 to n Json strings concatenated in fact

So you have an array of jsons, to start with. You should then be parsing the array of jsons first, and then each json separately.This is how I do it with Newtonsoft's library for .net. — Veverke
– Veverke, Commented Aug 8, 2016 at 15:25
I would loop through each character of the string, count the number of '{' and '}' characters. Once the amount of '{' are equal to the amount of '}' you know your first JSON string has ended. Except ofcourse when you start the loop and the amount for both of them is 0 — Alain Stoffels
– Alain Stoffels, Commented Aug 8, 2016 at 15:26
How about splitting the original string using split("}{") ? — Rajaprabhu Aravindasamy
– Rajaprabhu Aravindasamy, Commented Aug 8, 2016 at 15:26

Arnauld · Accepted Answer · 2016-08-08 15:33:45Z

9

You could just do:

var data = '{"data":{"time":"2016-08-08T15:13:19.605234Z","x":20,"y":30}}{"data":{"time":"2016-08-08T15:13:19.609522Z","x":30,"y":40}}';

var sanitized = '[' + data.replace(/}{/g, '},{') + ']';
var res = JSON.parse(sanitized);

console.log(res);

However, this will fail if one of the objects contains the }{ pattern in a string.

answered Aug 8, 2016 at 15:33

Arnauld

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3 Comments

user310291 Over a year ago

It works but I'd like to print x, y : see jsfiddle.net/ys6j038q

user310291 Over a year ago

I ask complementary question here: stackoverflow.com/questions/38834601/…

Arnauld Over a year ago

What you get here is an array of objects. If you want to access the x property of the second object, you'd have to do res[1].data.x.

micah · Accepted Answer · 2016-08-08 15:26:48Z

4

You can split them by the occurrence of } followed directly by { (ignoring whitespace).

var parts = str.split(/\}\s*\{/g);
for(var i = 0; i < parts.length; i++) {
  var part = parts[i].trim();

  if(part[0] !== '{') part = '{' + part;
  if(part[part.length-1] !== '}') part += '}';

  var json = JSON.parse(part);
}

answered Aug 8, 2016 at 15:26

micah

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5 Comments

Veverke Over a year ago

But each json contains nested objects. What if data is : {} ?

micah Over a year ago

@Veverke Those objects would be split by a comma.

Veverke Over a year ago

I was trying something less hard-wired. If this solves the issue, however, it's the answer :)

ssube Over a year ago

@Veverke JSON doesn't allow an unescaped }{ anywhere outside of strings. The spec is very concise, so you can check.

Veverke Over a year ago

Why anyway the source of this string does not return an array of jsons ? I would expect a comma separating each distinct js object enclosing the "data" property. If he has control over the source, I would fix this, and make things more intuitive.

Hitmands · Accepted Answer · 2016-08-08 15:39:53Z

1

Just split when /\}\s*\{/g and pass a value to fill to the Array.prototype.reduce function.

var str = '{"data":{"time":"2016-08-08T15:13:19.605234Z","x":20,"y":30}}{"data":{"time":"2016-08-08T15:13:19.609522Z","x":30,"y":40}}'

var data = (function(input) {
  let odd = true;
  
  return input.split(/\}\s*\{/g).reduce(function(res, part, i) {
    if(odd) {
      part += "}";
    } else {
      part = "{" + part;
    }
    
    odd = !odd;
    
    res[i] = JSON.parse(part);
    
    return res;
  }, {});
})(str)

console.log("data:", data);

answered Aug 8, 2016 at 15:39

Hitmands

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