Need to change JSON property using a variable

Question

c.key = "test";
a = {};
a.body = {};
a.body.interval={}; 
a.body.interval = c.key;

b = {};
b.body = {};
b.body.interval={}; 
b.body.interval = c.key;  

c["key"]="sample";

return JSON.stringify(a);

I want to change all the values which are referred by mentioned variable in javascript.

Currently, this print

{"body":{"interval":"test"}}

I want to change properties referred by c.key. I can not change individual properties of JSON as those are not fixed.

How can I change all the properties referred by an individual variable in javascript?

You can't determine at runtime whether a variable is actually a reference to another variable(or property/key in your case). What exactly are you trying to achieve here? — nicholaswmin
– nicholaswmin, Commented Jun 14, 2017 at 0:17
I have to set different properties after some time when I get the actual value. Those different properties share the same value, so I want to set them later when I have the value — Chirag
– Chirag, Commented Jun 14, 2017 at 0:18
You need an identification mechanism on each key you want to update. Then just explicitly update those fields when your actual value arrives — nicholaswmin
– nicholaswmin, Commented Jun 14, 2017 at 0:19
I do not want to individual update on the field, that is the reason I need some pass by reference mechanism which changes the underlying properties — Chirag
– Chirag, Commented Jun 14, 2017 at 0:22
What do you understand the meaning of "change a JSON property" to be? A JSON string is a snapshot, in JavvaScript Object Notation format, of some properties of an object. Just use the object if it's properties are changing. — traktor
– traktor, Commented Jun 14, 2017 at 0:22

Sina Mansour L. · Accepted Answer · 2017-06-14 01:21:32Z

2

Not sure if this is exactly what you want but using a function instead of a variable can solve your problem. (since you can pass a replace function to stringify.

take a look at the following code:

c = {};
c.key = "test"

a = {};
a.body = {};
a.body.interval = function(){return c.key};

c["key"]="sample";

JSON.stringify(a, function (key, value) {
        if (key == 'interval') {
            return value();
        } else {
            return value;
        }
    });

c = {};
c.key = "test"

a = {};
a.body = {};
a.body.interval = function(){return c.key};

c["key"]="sample";

out = JSON.stringify(a, function (key, value) {
        if (key == 'interval') {
            return value();
        } else {
            return value;
        }
    });
    
console.log(out);

edited Jun 14, 2017 at 1:21

answered Jun 14, 2017 at 1:16

Sina Mansour L.

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