@daki/logr - A Library for Standardizing Logs

Overview

This TypeScript log standardization library offers an easy and flexible way to standardize your application's logs. It offers the ability to customize the logging behavior of exceptions, transactions and validations, allowing you to adapt the library to the specific needs of your project.

Installation

To start using @daki/logr, you can install it via npm or yarn:

npm install @daki/logr
# or
yarn add @daki/logr

Main features

• Catch Exception
• Catch Transaction [TODO]

Catch exception

We provide two ways to catch exceptions:

• the CatchException decorator to use in your methods
• the catchException function so that you don't have to use classes to use the library

Configuration options

Option	Type	Required/Optional	Default value	Description	Example using function	Example using decorator
bubbleException	boolean	Optional	true	If set to true, the original exception will be thrown after logging, allowing the exception to continue its propagation.	Function	Decorator
customErrorInstance	object or function	Optional	null	Allows you to specify a custom error instance to be thrown, useful for customizing the exception that is logged.	Function	Decorator
hideParams	boolean	Optional	false	If set to true, the parameters that have been passed to the method will not be recorded, keeping sensitive data private.	Function	Decorator
isSync	boolean	Optional	false	Defines whether the method is synchronous, indicating whether or not it waits for responses from external calls.
kind	string	Optional	null	Defines the type of exception to be logged, allowing exceptions to be categorized into different groups or contexts.
onException	function	Optional	null	It allows you to provide a custom function to handle the registered exception, executing specific actions when an exception occurs.	Function	Decorator
pipeParams	function	Optional	null	It allows you to use a function to process and transform the parameters before they are recorded, adapting them to the desired format.	Function	Decorator
returnOnException	function	Optional	null	It offers the ability to provide a custom function to handle the logged exception and return new information or values after the exception has been logged.	Function	Decorator
typeErrorHandling	"LOG" or "REGISTER"	Optional	"LOG"	Defines the type of exception handling to be applied: LOG or REGISTER. If set to LOG, the exception will be logged. If set to REGISTER, the exception will be logged in the service to be logged in higher layers.	Function	Decorator

Basic usage

Decorator:

import { CatchException } from '@daki/logr';

export class UserController {
  @CatchException({
    kind: 'Application',
  })
  public async getById(id: string) {
    // Your logic for getting a user
  }
}

Function:

import { catchException } from '@daki/logr';

export const getUserById = catchException(async (id: string) => {
  // Your logic for getting a user
}, {
  kind: 'Application',
});

import { catchException, CatchExceptionOptions } from '@daki/logr';

const options: CatchExceptionOptions = {
  kind: 'Application',
}

async function handleGetUserById(id: string) {
  // Your logic for getting a user
}

export const getUserById = catchException(handleGetUserById, options);

Log output

User is blocked {
  "timestamp": "2023-09-12T22:45:13.468Z",
  "logger": {
    "name": "UserController",
    "method_name": "getById",
    "params": ["c4baf266-13c9-4d6e-93a7-ff8dccde0905"],
  },
  "error": {
    "name": "UserServiceError",
    "message": "User is blocked",
    "stack": {ErrorStack},
    "kind": "Application"
  }
}