Question

84

Array of Array, JSON.stringify() giving empty array instead of entire object

rated 0 times [ 85] [ 1] / answers: 1 / hits: 24473 / 9 Years ago, fri, february 13, 2015, 12:00:00

Here's my array (from Chrome console):

array

Here's the pertinent part of code:

console.log(hours);

var data = JSON.stringify(hours);

console.log(data);

In Chrome's console I get [] from the last line. I should get {'Mon':{...}...}

Here is the minimal amount of JavaScript to reproduce the issue:

var test = [];

test[11h30] = 15h00

test[18h30] = 21h30

console.log(test);    

console.log(JSON.stringify(test)); // outputs []

I tried some other stuff like
Convert array to JSON or Convert javascript object or array to json for ajax data but the problem remains.

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dominics

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answered 9 Years ago aidanl · Accepted Answer

Here is the minimal amount of javascript to reproduce the issue

var test = [];

test[11h30] = 15h00

test[18h30] = 21h30

console.log(test);    

console.log(JSON.stringify(test)); // outputs []

The issue with the above is that, while javascript will be happy to let you late-bind new properties onto Array, JSON.stringify() will only attempt to serialize the actual elements in the array.

A minimal change to make the object an actual object, and JSON.stringify works as expected:

var test = {}; // here is thre only change. new array ([]) becomes new object ({})

test[11h30] = 15h00

test[18h30] = 21h30

console.log(test);

console.log(JSON.stringify(test)); // outputs {11h30:15h00,18h30:21h30}