(Node.js) Get the Index of a JSON Member

This example demonstrates how to get the index of a given member by name.

{
  "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;
    }

    // The top-level JSON object has three members: name, image, and thumbnail.
    var nameIndex = json.IndexOf("name");
    // The index of the "name" member is 0.
    console.log("nameIndex = " + nameIndex);

    var thumbIndex = json.IndexOf("thumbnail");
    // The index of the "thumbnail" member is 2.
    console.log("thumbIndex = " + thumbIndex);

    // The "fname" member is NOT a direct member of the top-level JSON object.
    // It is a member of a nested object.  If we try to get the index of this
    // member using the top-level JSON object, it is not found (and returns -1).
    var fnameIndex = json.IndexOf("fname");
    // The fnameIndex is -1 (not found).  This is correct.
    console.log("fnameIndex = " + fnameIndex);

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

    // Now we can get the index of the "fname" object, because it is a direct
    // member of the "image" object:
    fnameIndex = imageObj.IndexOf("fname");
    console.log("fnameIndex = " + fnameIndex);


}

chilkatExample();