JSON Object not fully converts to String?

Question

I am facing an issue that JSON.stringify not stringifies all the keys in a JSON Object.

ie. window.performance.getEntries()[0] contains around 17 keys. But on converting to a string, the result contains only 4 keys.

How can I convert all the keys in window.performance.getEntries()[0]?

I want the complete string output of window.performance.getEntries() which is an array and I used JSON.stringify(window.performance.getEntries()).

Thanks in advance..

Sorry, but without an example or screenshot, we cannot help you... — Mr. Polywhirl, Nov 12 '15 at 13:36
Works for me `JSON.parse(JSON.stringify(window.performance.getEntries())).length == window.performance.getEntries().length == true` have you examined the entry at which parsing stops? — Alex K., Nov 12 '15 at 13:36
@AlexK. — `window.performance.getEntries()` != `window.performance.getEntries()[0]` The question is asking about the properties of the objects in the array that returns, not the entries in the array itself. — Quentin, Nov 12 '15 at 13:37
Aye but *I want the complete string output of window.performance.getEntries()* — Alex K., Nov 12 '15 at 13:37
@AlexK. — Which would include **all** of the properties of all the objects it contains, not just **some** of the properties for all of the objects. — Quentin, Nov 12 '15 at 13:38
That is very interesting that it is only including only four. For the lazy, run it in your Chrome console... — epascarello, Nov 12 '15 at 13:39
For sample Just paste window.performance.getEntries() or Just performance.getEntries() in browser console. — Saidh, Nov 12 '15 at 13:40
Possible duplicate of [JSON.stringify is ignoring object properties](http://stackoverflow.com/questions/20511421/json-stringify-is-ignoring-object-properties) — David P., Nov 12 '15 at 13:47

score 1 · Answer 1 · edited May 23 '17 at 12:15

window.performance seems to have is own toJSON-function and so can determine what will be stringified. Here is a answer and a work around to your question from a similiar question: https://stackoverflow.com/a/20511811/3400898

"If the stringify method sees an object that contains a toJSON method, it calls that method, and stringifies the value returned. This allows an object to determine its own JSON representation."

epascarello · Answer 2 · 2015-11-12T14:06:41.953

0

As other stated it is because there is a toJSON method defined. Basically you need to loop over every index of the array and than every property in the object.

var adjusted = window.performance.getEntries().map( function (result) {       
    var temp = {}, key;
    for (key in result) if (key!=="toJSON") temp[key]=result[key]; 
    return temp;
});
console.log(JSON.stringify(adjusted[0]));

edited Nov 12 '15 at 14:06

answered Nov 12 '15 at 13:59

epascarello

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score 0 · Answer 3 · answered Nov 12 '15 at 14:28

0

The simplified solution for this problem which I found is

var jsonArray = $.map(performance.getEntries(),function(jsonObj){
    var obj = $.extend({},jsonObj);
    delete obj.toJSON;
    return obj;
});

JSON.stringify(jsonArray);

answered Nov 12 '15 at 14:28

Saidh

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JSON Object not fully converts to String?

3 Answers3