(Node.js) Modify Parts of JSON Document

Demonstrates how to modify parts of a JSON document. This example uses the following JSON document:

{
   "fruit": [
      	{
         "kind": "apple",
	 "count": 24,
	 "fresh": true,
	 "extraInfo": null,
	 "listA": [ "abc", 1, null, false ],
	 "objectB": { "animal" : "monkey" }
      	},
	{
         "kind": "pear",
	 "count": 18,
	 "fresh": false,
	 "extraInfo": null
	 "listA": [ "xyz", 24, null, true ],
	 "objectB": { "animal" : "lemur" }
	}
    ],
    "list" : [ "banana", 12, true, null, "orange", 12.5, { "ticker": "AAPL" }, [ 1, 2, 3, 4, 5 ] ],
    "alien" : true
}

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();

    // Load the JSON from a file.
    var success = json.LoadFile("qa_data/json/modifySample.json");
    if (success !== true) {
        console.log(json.LastErrorText);
        return;
    }

    // This example will not check for errors (i.e. null / false / 0 return values)...

    // Get the "list" array:
    // listA: JsonArray
    var listA = json.ArrayOf("list");

    // Modify values in the list.

    // Change banana to plantain
    success = listA.SetStringAt(0,"plantain");

    // Change 12 to 24
    success = listA.SetIntAt(1,24);

    // Change true to false
    success = listA.SetBoolAt(2,false);

    // Is the 3rd item null?
    var bNull = listA.IsNullAt(3);

    // Change "orange" to 32.
    success = listA.SetIntAt(4,32);

    // Change 12.5 to 31.2
    success = listA.SetNumberAt(5,"31.2");

    // Replace the { "ticker" : "AAPL" } object with { "ticker" : "GOOG" }
    // Do this by deleting, then inserting a new object at the same location.
    success = listA.DeleteAt(6);
    success = listA.AddObjectAt(6);
    // tickerObj: JsonObject
    var tickerObj = listA.ObjectAt(6);
    success = tickerObj.AddStringAt(-1,"ticker","GOOG");

    // Replace "[ 1, 2, 3, 4, 5 ]" with "[ "apple", 22, true, null, 1080.25 ]"
    success = listA.DeleteAt(7);
    success = listA.AddArrayAt(7);
    // aa: JsonArray
    var aa = listA.ArrayAt(7);
    success = aa.AddStringAt(-1,"apple");
    success = aa.AddIntAt(-1,22);
    success = aa.AddBoolAt(-1,true);
    success = aa.AddNullAt(-1);
    success = aa.AddNumberAt(-1,"1080.25");

    // Get the "fruit" array
    // aFruit: JsonArray
    var aFruit = json.ArrayAt(0);

    // Get the 1st element:
    // appleObj: JsonObject
    var appleObj = aFruit.ObjectAt(0);

    // Modify values by member name:
    success = appleObj.SetStringOf("fruit","fuji_apple");
    success = appleObj.SetIntOf("count",46);
    success = appleObj.SetBoolOf("fresh",false);
    success = appleObj.SetStringOf("extraInfo","developed by growers at the Tohoku Research Station in Fujisaki");

    // Modify values by index:
    // pearObj: JsonObject
    var pearObj = aFruit.ObjectAt(1);
    success = pearObj.SetStringAt(0,"bartlett_pear");
    success = pearObj.SetIntAt(1,12);
    success = pearObj.SetBoolAt(2,false);
    success = pearObj.SetStringAt(3,"harvested in late August to early September");

    json.EmitCompact = false;
    console.log(json.Emit());

}

chilkatExample();