Rslog

A tiny, intuitive, type-friendly logger for Node.js.

• Tiny. 2kB gzipped.
• Clean. Zero dependencies.
• Intuitive. Clear log prefix.
• Type-friendly. Written in TypeScript.

Preview

Install

# with npm
npm add rslog

# with yarn
yarn add rslog

# with pnpm
pnpm add rslog

# with bun
bun add rslog

Usage

• Require:

// with require
const { logger } = require('rslog');

// with import
import { logger } from 'rslog';

• Log:

// A gradient welcome log
logger.greet(`\n➜ Rslog v1.0.0\n`);

// Info
logger.info('This is a info message');

// Start
logger.start('This is a start message');

// Warn
logger.warn('This is a warn message');

// Ready
logger.ready('This is a ready message');

// Success
logger.success('This is a success message');

// Error
logger.error('This is a error message');
logger.error(new Error('This is a error message with stack'));

// Debug
logger.debug('This is a debug message');

// Same as console.log
logger.log('This is a log message');

Log Level

You can create a new logger instance through createLogger and specify the log level:

import { createLogger } from 'rslog';

const logger = createLogger({ level: 'warn' });

// Will print
logger.error('This is a error message');
logger.warn('This is a warn message');

// Will not print
logger.info('This is a info message');
logger.log('This is a log message');

You can also directly modify the level attribute of the logger instance:

logger.level = 'verbose';

The log levels of each method are as follows:

Level	Method
error	error
warn	warn
info	info, start, ready, success
log	log
verbose	debug

Override

You can use logger.override to override some or all methods of the default logger.

import { logger } from 'rslog';

logger.override({
  log: message => {
    console.log(`[LOG] ${message}`);
  },
  info: message => {
    console.log(`[INFO] ${message}`);
  },
  warn: message => {
    console.log(`[WARN] ${message}`);
  },
  error: message => {
    console.log(`[ERROR] ${message}`);
  },
});

Environment

Rslog provides both CommonJS and ESModule output and supports Node.js >= 14.

Credits

Rslog is built with Modern.js.

The color implementation of Rslog are modified from alexeyraspopov/picocolors.

License

Rslog is MIT licensed.