The functionality of JSON.stringify does not take into account object properties

Question

The functionality of JSON.stringify does not take into account object properties

Check out the example on jsfiddle at http://jsfiddle.net/frigon/H6ssq/

I have encountered an issue where JSON.stringify is ignoring certain fields. Is there a way to make JSON.stringify include them in the parsing?

In the provided jsfiddle code...

<script src="http://cdn.kendostatic.com/2012.2.710/js/kendo.all.min.js"></script>
    <script>
    var model = kendo.data.Model.define({id: "ID", fields: {"Name":{type: "string"}}});
    var obj = new model();
    obj.set("Name","Johhny Foosball");
    document.write("<br />obj.dirty property exists: ");
    document.write(obj.dirty);
    document.write("<br/>obj.uid property exists: ");
    document.write(obj.uid);
    document.write("<br/>However, they are not included in JSON.stringify():<br/>");    
    document.write(JSON.stringify(obj));
</script>

you will see the following output:

obj.dirty property exists: true

obj.uid property exists: b4af4dfc-9d94-4a2d-b286-d6f4cbc991d8

However, they are not included in JSON.stringify():

{"ID":"","Name":"Johhny Foosball"}

javascript json kendo-ui stringify

Answer 1

Answer №1

When an item possesses its own toJSON() method, JSON.stringify() will utilize the object that is returned from that method to stringify it. The kendo.data.Model has its own custom toJSON() method which solely returns the properties specified on the model. This explains why certain values (such as dirty, id, uid) are not visible in the string result.

"If the stringify method encounters an object with a toJSON method, it will invoke that method and stringify the resultant value. This grants an object the ability to specify its own JSON representation."

If you require all properties to be present on the object, you can consider this alternative approach:

var model = kendo.data.Model.define({
    id: "ID",
    fields: {
        "Name": { type: "string" }
    }
});
var obj = new model();
obj.set("Name","Johhny Foosball");    
var newObj = $.extend({}, obj);
delete newObj.toJSON;
document.write(newObj.dirty);
document.write(JSON.stringify(newObj));

..and view the updated fiddle here.

Essentially, I utilized jQuery.extend to duplicate the object and then removed the toJSON function. Proceed with caution! :)

Answer 2

When an item possesses its own toJSON() method, JSON.stringify() will utilize the object that is returned from that method to stringify it. The kendo.data.Model has its own custom toJSON() method which solely returns the properties specified on the model. This explains why certain values (such as dirty, id, uid) are not visible in the string result.

"If the stringify method encounters an object with a toJSON method, it will invoke that method and stringify the resultant value. This grants an object the ability to specify its own JSON representation."

If you require all properties to be present on the object, you can consider this alternative approach:

var model = kendo.data.Model.define({
    id: "ID",
    fields: {
        "Name": { type: "string" }
    }
});
var obj = new model();
obj.set("Name","Johhny Foosball");    
var newObj = $.extend({}, obj);
delete newObj.toJSON;
document.write(newObj.dirty);
document.write(JSON.stringify(newObj));

..and view the updated fiddle here.

Essentially, I utilized jQuery.extend to duplicate the object and then removed the toJSON function. Proceed with caution! :)

Answer 3

Answer №2

For those utilizing NodeJS, consider using the following code snippet:

import * as utility from 'util';
utility.inspect(data)

as an alternative to JSON.stringify.

Answer 4

For those utilizing NodeJS, consider using the following code snippet:

import * as utility from 'util';
utility.inspect(data)

as an alternative to JSON.stringify.

Answer 5

Answer №3

One way to handle this issue is by utilizing a custom JSON.stringify function for dealing with Sequelize models. This approach involves serializing the object before making any modifications:

serializedObj = JSON.stringify(obj) // using a specialized JSON.stringify implementation
obj = JSON.parse(serializedObj) // only includes properties defined in the model's schema
obj.dirty = "whatever";
finalObj = JSON.stringify(obj); // now the changes are reflected without relying on a custom JSON.stringify method

Answer 6

One way to handle this issue is by utilizing a custom JSON.stringify function for dealing with Sequelize models. This approach involves serializing the object before making any modifications:

serializedObj = JSON.stringify(obj) // using a specialized JSON.stringify implementation
obj = JSON.parse(serializedObj) // only includes properties defined in the model's schema
obj.dirty = "whatever";
finalObj = JSON.stringify(obj); // now the changes are reflected without relying on a custom JSON.stringify method

Answer 7

Answer №4

Having faced a similar issue, I was delighted to find a workaround for retrieving the original object without all the unnecessary additional properties added by kendo:

cleanObj = JSON.parse(JSON.stringify(kendoData));

This problem arose when I had to transfer the selected item from a kendo tree to a directive for formatting JSON data. Much to my dismay, keno had already altered my initial object.

<div kendo-tree-view="treeView" k-data-source="dataTree" k-on-change="selectedItem=chosenItem">
    {{chosenItem.text}}
</div>

<json-display open="1" jsonData="selectedItem"></json-display>

Answer 8

Having faced a similar issue, I was delighted to find a workaround for retrieving the original object without all the unnecessary additional properties added by kendo:

cleanObj = JSON.parse(JSON.stringify(kendoData));

This problem arose when I had to transfer the selected item from a kendo tree to a directive for formatting JSON data. Much to my dismay, keno had already altered my initial object.

<div kendo-tree-view="treeView" k-data-source="dataTree" k-on-change="selectedItem=chosenItem">
    {{chosenItem.text}}
</div>

<json-display open="1" jsonData="selectedItem"></json-display>

The functionality of JSON.stringify does not take into account object properties

Answer №1

Answer №2

Answer №3

Answer №4

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