Node.js GMail: Parse GMail REST API Error Response

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Gets the current user's Gmail profile, but shows an error response and how to parse it..

Documentation: https://developers.google.com/gmail/api/v1/reference/users/getProfile

var os = require('os');
if (os.platform() == 'win32') {  
    var chilkat = require('chilkat_node6_win32'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('chilkat_node6_arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('chilkat_node6_linux32');
    } else {
        var chilkat = require('chilkat_node6_linux64');
    }
} else if (os.platform() == 'darwin') {
    var chilkat = require('chilkat_node6_macosx');
}

function chilkatExample() {

    var rest = new chilkat.Rest();
    var success;

    //   Provide a previously obtained OAuth2 access token.
    var oauth2 = new chilkat.OAuth2();
    oauth2.AccessToken = "OAUTH2_ACCESS_TOKEN";
    rest.SetAuthOAuth2(oauth2);

    success = rest.Connect("www.googleapis.com",443,true,true);
    if (success !== true) {
        console.log(rest.LastErrorText);
        return;
    }

    rest.AddPathParam("userId","matt@chilkat.io");

    var sbJson = new chilkat.StringBuilder();
    success = rest.FullRequestNoBodySb("GET","/gmail/v1/users/userId/profile",sbJson);
    if (success !== true) {
        console.log(rest.LastErrorText);
        return;
    }

    if (rest.ResponseStatusCode !== 200) {
        console.log("Received error response code: " + rest.ResponseStatusCode);
        console.log("Response body:");
        console.log(sbJson.GetAsString());
        return;
    }

    var json = new chilkat.JsonObject();
    json.LoadSb(sbJson);

    //  The following code parses the JSON response.
    //  A sample JSON response is shown below the sample code.
    var errorCode;
    var errorMessage;
    var i;
    var count_i;
    var domain;
    var reason;
    var message;
    var extendedHelp;

    errorCode = json.IntOf("error.code");
    errorMessage = json.StringOf("error.message");
    i = 0;
    count_i = json.SizeOfArray("error.errors");
    while (i < count_i) {
        json.I = i;
        domain = json.StringOf("error.errors[i].domain");
        reason = json.StringOf("error.errors[i].reason");
        message = json.StringOf("error.errors[i].message");
        extendedHelp = json.StringOf("error.errors[i].extendedHelp");
        i = i+1;
    }

    console.log("Example Completed.");

}

chilkatExample();

Sample JSON Response Body

{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "accessNotConfigured",
    "message": "Access Not Configured. Gmail API has not been used in project 377697329735 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/gmail.googleapis.com/overview?project=377697329735 then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry.",
    "extendedHelp": "https://console.developers.google.com/apis/api/gmail.googleapis.com/overview?project=377697329735"
   }
  ],
  "code": 403,
  "message": "Access Not Configured. Gmail API has not been used in project 377697329735 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/gmail.googleapis.com/overview?project=377697329735 then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry."
 }
}