@sumor/logger

logger

A Sumor Cloud Tool.
More Documentation

This is a lightweight logger for Node.JS. It can output logs in different levels, and you can customize the scope, id, and timezone.

Installation

npm i @sumor/logger --save

Prerequisites

Node.JS version

Require Node.JS version 16.x or above

require Node.JS ES module

As this package is written in ES module, please change the following code in your package.json file:

{
    "type": "module"
}

Usage

General Usage

import Logger from '@sumor/logger';
const logger = new Logger();

logger.trace("Hello World!");
// You will see the following output:
// 2020-01-01 00:00:00.000 TRACE MAIN - Hello World!

Change Scope

For some case, we need categorize logs. scope is used for this purpose.

import Logger from '@sumor/logger';
const logger = new Logger({
    scope: 'DEMO'
});
logger.trace("Hello World!");
// You will see the following output:
// 2020-01-01 00:00:00.000 TRACE DEMO - Hello World!

Identifier User

For some case, we need identifier user. id is used for this purpose.

import Logger from '@sumor/logger';
const logger = new Logger({
    id: 'USER001'
});
logger.trace("Hello World!");
// You will see the following output:
// 2020-01-01 00:00:00.000 TRACE MAIN USER001 - Hello World!

Change Level

Most of the time, we only need to output logs of a certain level. Then we can decide if store and display it or not.

import Logger from '@sumor/logger';
const logger = new Logger();
logger.trace("Hello World!"); // trace is the lowest level, all logs will be output
logger.debug("Hello World!");
logger.info("Hello World!");
logger.warn("Hello World!");
logger.error("Hello World!");
logger.fatal("Hello World!"); // fatal is the highest level, only critical error will be output

Change Timezone

import Logger from '@sumor/logger';
const logger1 = new Logger({
    offset: 2 * 60 // UTC+2 offset is 2 hours
});
logger1.info("Hello World!");
// You will see the following output:
// 2020-01-01 02:00:00.000 INFO MAIN - Hello World!

const logger2 = new Logger({
    offset: 8 * 60 // UTC+8 offset is 8 hours
});
logger2.info("Hello World!");
// You will see the following output:
// 2020-01-01 08:00:00.000 INFO MAIN - Hello World!