(Node.js) JSON: Nested Objects

Here we have a JSON object that contains nested JSON objects. This example demonstrates how to access the contents of the nested objects.

{
  "name": "donut",
  "image":
    {
    "fname": "donut.jpg",
    "w": 200,
    "h": 200
    },
  "thumbnail":
    {
    "fname": "donutThumb.jpg",
    "w": 32,
    "h": 32
    }
}

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    var json = new chilkat.JsonObject();

    // This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
    // The presence of whitespace chars for pretty-printing makes no difference to the Load
    // method. 
    var jsonStr = "{\"name\": \"donut\",\"image\":{\"fname\": \"donut.jpg\",\"w\": 200,\"h\": 200},\"thumbnail\":{\"fname\": \"donutThumb.jpg\",\"w\": 32,\"h\": 32}}";

    var success = json.Load(jsonStr);
    if (success !== true) {
        console.log(json.LastErrorText);
        return;
    }

    // Get the "image" object.
    // imageObj: JsonObject
    var imageObj = json.ObjectOf("image");
    if (json.LastMethodSuccess == false) {
        console.log("image object not found.");
        return;
    }

    console.log("image: fname=" + imageObj.StringOf("fname") + ", width=" + imageObj.IntOf("w") + ", height=" + imageObj.IntOf("h"));

    // Get the "thumbnail" object.
    // thumbObj: JsonObject
    var thumbObj = json.ObjectOf("thumbnail");
    if (json.LastMethodSuccess == false) {
        console.log("thumbnail object not found.");
        return;
    }

    console.log("thumbnail: fname=" + thumbObj.StringOf("fname") + ", width=" + thumbObj.IntOf("w") + ", height="
         + thumbObj.IntOf("h"));


}

chilkatExample();