Stringify an object with function expressions - javascript

Question

Is it possible? I need to stringify js object with function expressions with all value types on other fields to be not changed.

Example:

I have such javascript object -

var obj = {
    propText: "some text",
    propBool: true,
    propNum: 12345,
    method: function () {
       // some logic here
    }
};

Unfortunately if I'll use JSON.stringify(obj); it will return string without method..

Then I can use replacer function like this:

JSON.stringify(obj, function (key, val) {
  if (typeof val === 'function') {
    return '' + val;
  }
  return val;
});

which will bring me string with functions like strings inside like "function () { ... }"..

Another option I've tried is more complex but result is still a bit not acceptable - use custom stringify function that will wrap JSON.stringify and then replace placeholders in strings

var stringify = function (obj, prop) {
  var placeholder = '____PLACEHOLDER____';
  var fns = [];
  var json = JSON.stringify(obj, function(key, value) {
    if (typeof value === 'function') {
      fns.push(value);
      return placeholder;
    }
    return value;
  });
  json = json.replace(new RegExp('"' + placeholder + '"', 'g'), function(_) {
    return fns.shift();
  });
  return json;
};

but this function is not acceptable for example if you pass another values:

JSON.stringify(22); // outputs 22 typeof number
stringify(22); // outputs 22 typeof function because of .replace() :(

I want my stringified object to look like:

'{
    "propText": "some text",
    "propBool": true,
    "propNum": 12345,
    "method": function () { ... }
}'

What do you want the functions to look like in the stringified version? — jfriend00, Aug 21 '14 at 09:11
possible duplicate of [Is there a way to print all methods of an object in javascript?](http://stackoverflow.com/questions/152483/is-there-a-way-to-print-all-methods-of-an-object-in-javascript) — Matías Fidemraizer, Aug 21 '14 at 09:12
Take a look at this : http://www.kristofdegrave.be/2012/07/json-serialize-and-deserialize.html — ovi, Aug 21 '14 at 09:12
@jfriend00 I've updated the question with how it should look like — Kosmetika, Aug 21 '14 at 10:34
The example for what you said you want it to look like isn't a valid javascript string because you're using double quotes both as end delimiters and within the string. — jfriend00, Aug 21 '14 at 10:44
What do you need this for? Notice that not in all JS implementations you can stringify functions at all. — Bergi, Aug 21 '14 at 11:02

Stringify an object with function expressions - javascript

0 Answers0