(Node.js) Check if Integer Exists at JSON Path

Demonstrates how to get an integer value at a JSON path, and how to check to see if it exists.

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();
    var success;

    // First build simple JSON..
    json.UpdateInt("test.abc",100);

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

    // This is our JSON:
    // {
    //   "test": {
    //     "abc": 100,
    //   }
    // }

    var path = "test.notHere";

    // The call to IntOf will return 0, because it's not present.
    // But how do we know if it really was present, and the value was truly 0?
    var val = json.IntOf(path);
    console.log("val = " + val);

    // We cannot use LastMethodSuccess because LastMethodSuccess only applies
    // to methods that:
    // - return a string
    // - return a new Chilkat object, binary bytes, or a date/time.
    // - returns a boolean status where true = success and false = failed.
    // - returns an integer where failure is defined by a return value less than zero.
    // The IntOf method fits none of these requirements, and therefore the LastMethodSuccess 
    // is not a valid indicator..
    var wasFound = json.LastMethodSuccess;
    console.log("wasFound = " + wasFound + " (not a valid indicator)");

    // Instead, if the returned value is 0, we can double-check to see if the member was truly there..
    if (val == 0) {
        wasFound = json.HasMember(path);
        console.log("wasFound = " + wasFound);
        if (wasFound == true) {
            console.log("The value was present and is 0.");
        }
        else {
            console.log("no member is present at test.notHere");
        }

    }
    else {
        console.log("val = " + val);
    }

    // Alternatively, you could check to see if the member exists beforehand..
    if (json.HasMember(path) == true) {
        console.log("val = " + json.IntOf(path));
    }
    else {
        console.log("no member at " + path);
    }


}

chilkatExample();