meseeks

Tiny Error handler

Tiny and plugeable error handler with zero dependencies.

Quick usage

const { ApplicationError } = require('meseeks');

class DatabaseError extends ApplicationError {
    constructor(message, status, code) {
        super(message, status, code);
    }
}

const dbError = new DatabaseError('Critical error.', 500, 3500);

// Console output
// { date: 'Mon, 04 May 2020 17:04:50 GMT',
//  http_status: 500,
//  message: 'Critical error.',
//  code: 3500,
//  stack:
//   'Error\n at DatabaseError.ApplicationError ...' }

Base class

The package contains a base class named ApplicationError with the follow properties and methods:

Property	Type	Description
_message	private	Custom error message.
_code	private	Application specific error code.
_status	private	HTTP status code.
_debug	private	Debug flag. Default true
_error	private	Error in JSON format with properties: name, message, status and code.
getError()	public	Returns the _error object.

API

The base class contains a couple of static methods to make it plugeable.

$config

This static method allows change, for now, the debug flag.

 ApplicationError.$config({ debug: false });

$addEvent

The base class contains an events stack that executes when a instance occur. You can add custom events for all the subclasses or for a specific subclass, and the method can access to the private properties and methods shown in the previous table.

For all subclasses:

const { ApplicationError } = require('meseeks');

function customLog() {
    console.log(`My HTTP status is: ${this._status}`);
}

ApplicationError.$addEvent(customLog);

class DatabaseError extends ApplicationError {
    constructor(message, status, code) {
        super(message, status, code);
    }
}

const dbError = new DatabaseError('Critical error.', 500, 3500);

// Console output
// { date: 'Mon, 04 May 2020 17:04:50 GMT',
//  http_status: 200,
//  message: 'Critical error.',
//  code: 500,
//  stack:
//   'Error\n at DatabaseError.ApplicationError ...' }
// My HTTP status is 500

For a specific subclass:

const { ApplicationError } = require('meseeks');

function customLog() {
    console.log(`My HTTP status is: ${this._status}`);
}

class DatabaseError extends ApplicationError {
    constructor(message, status, code) {
        super(message, status, code);
    }
}

class DatabaseError2 extends ApplicationError {
    constructor(message, status, code) {
        super(message, status, code);
    }
}

DatabaseError.$addEvent(customLog);

const dbError = new DatabaseError('Critical error.', 500, 3500);
const dbError2 = new DatabaseError('Critical error 2.', 509, 3100);

// Console output
// { date: 'Mon, 04 May 2020 17:04:50 GMT',
//  http_status: 500,
//  message: 'Critical error.',
//  code: 3500,
//  stack:
//   'Error\n at DatabaseError.ApplicationError ...' }
// My HTTP status is 500
// { date: 'Mon, 04 May 2020 17:04:50 GMT',
//  http_status: 509,
//  message: 'Critical error.',
//  code: 3100,
//  stack:
//   'Error\n at DatabaseError2.ApplicationError ...' }