(Node.js) JSON: Miscellaneous Operations

Demonstrates a variety of JSON API methods. This example uses the following JSON document:

{
   "alphabet": "abcdefghijklmnopqrstuvwxyz",
   "sampleData" : {
           "pi": 3.14,
	   "apple": "juicy",
	   "hungry": true,
	   "withoutValue": null,
           "answer": 42
          
	}
}

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

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    var json = new chilkat.JsonObject();
    json.EmitCompact = false;

    // Assume the file contains the data as shown above..
    var success = json.LoadFile("qa_data/json/sample2.json");
    if (success !== true) {
        console.log(json.LastErrorText);
        return;
    }

    // First navigate to the "sampleData" object:
    // sampleData: JsonObject
    var sampleData = json.ObjectOf("sampleData");

    // Demonstrate BoolAt and BoolOf
    console.log("hungry: " + sampleData.BoolOf("hungry"));
    console.log("hungry: " + sampleData.BoolAt(2));

    // StringOf returns the value as a string regardless of it's actual type:
    console.log("pi: " + sampleData.StringOf("pi"));
    console.log("answer: " + sampleData.StringOf("answer"));
    console.log("withoutValue: " + sampleData.StringOf("withoutValue"));
    console.log("hungry: " + sampleData.StringOf("hungry"));

    // Demonstrate IsNullOf / IsNullAt
    console.log("withoutValue is null? " + sampleData.IsNullOf("withoutValue"));
    console.log("withoutValue is null? " + sampleData.IsNullAt(3));
    console.log("apple is null? " + sampleData.IsNullOf("apple"));
    console.log("apple is null? " + sampleData.IsNullAt(1));

    // IntOf
    console.log("answer: " + sampleData.IntOf("answer"));

    // SetNullAt, SetNullOf
    // Set "pi" to null
    success = sampleData.SetNullAt(0);
    // Set "answer" to null
    success = sampleData.SetNullOf("answer");

    // Show the changes:
    console.log(json.Emit());

    // Restore pi and apple:
    success = sampleData.SetNumberAt(0,"3.14");
    success = sampleData.SetNumberOf("answer","42");

    // Show the changes:
    console.log(json.Emit());

    // Add a null value named "afterApple" just after "apple"
    success = sampleData.AddNullAt(2,"afterApple");

    // Add a boolean value just after "pi"
    success = sampleData.AddBoolAt(1,"afterPi",false);

    // Examine the changes..
    console.log(json.Emit());

}

chilkatExample();