log-timed

Lightweight logging with timestamps, colors and file support.

Uses chalk for colors.
File writing is asynchronous and doesn't block process.

Install

npm install log-timed

Usage

import { casual as log } from 'log-timed'

log('Simple message')
log.file('Log to console and file')
log.error('Error occurred')
log.multiline({ user: 'John', data: [1, 2, 3] })
log.compact('Line 1\nLine 2\nLine 3')

Custom logger

import createLogger from 'log-timed'

const log = createLogger({
    useDate: true, // show date
    useMs: true, // show milliseconds
    colorLeft: 'blue', // timestamp color
    file: 'app_', // file prefix
})

log('Custom logging')

Methods

Basic:

• log() - standard logging
• .log(...args) - multiple arguments like console.log
• .logFile(...args) - multiple arguments with file write
• .file() - log to console and file
• .fileOnly() - log to file only
• .multiline() - multiline object output
• .compact() - compress newlines to single line
• .rewrite() - rewrite last console line
• .clear() - clear terminal

Event logging:

• .success() - success operations (green)
• .info() - informational messages (cyan)
• .warn() - warnings (yellow)
• .error() - errors (red)
• .debug() - debug info (dimmed)

Each event method has a *File() version for writing to file with corresponding prefix (e.g., success_, info_). To write to file without prefix, use method(data, { file: true }).

Presets

import { free, simple, casual, full, iso } from 'log-timed'

free('No timestamps') // No timestamps
simple('With time') // [03:00:00] With time
casual('With milliseconds') // [13:37:42.999] With milliseconds
full('Full date and time') // [2025.12.31 23:59:59.999] Full date and time
iso('ISO format') // [2025-10-21T01:21:00.000Z] ISO format

File logging

Logs are saved to ./logs/ directory with YYYY.MM.DD.log naming by default.

// Default file: ./logs/2025.11.07.log
log.file('message')
log('message', { file: true })

// With prefix: ./logs/error_2025.11.07.log
log('message', { file: 'error_' })
log.errorFile('message')

// Custom filename: ./logs/app.log
log('message', { file: 'app.log' })

// Custom path: ./custom/path/app.log
log('message', { file: './custom/path/app.log' })

// File only (no console output)
log('message', { fileOnly: true })

Multiline formatting

// Objects
log({ data: 'test' }) // {"data":"test"}
log({ data: 'test' }, { multiline: true }) // pretty JSON (4 spaces)
log({ data: 'test' }, { multiline: 2 }) // pretty JSON (2 spaces)

// Compact with separators
log('line1\nline2', { multiline: ' ' }) // "line1 line2"
log('line1\nline2', { multiline: '' }) // "line1line2"
log('line1\nline2', { multiline: ', ' }) // "line1, line2"

Config

• useDate - show date
• useMs - show milliseconds
• colorLeft - timestamp color
• colorRight - message color
• colorMs - milliseconds color (default: 'gray')
• color - set both colorLeft and colorRight
• file - file prefix or boolean
• leftFn - custom function for left part