pino-roll

A Pino transport that automatically rolls your log files.

Install

npm i pino-roll

Usage

import { join } from 'path'
import pino from 'pino'

const transport = pino.transport({
  target: 'pino-roll',
  options: { file: join('logs', 'log'), frequency: 'daily', mkdir: true }
})

const logger = pino(transport)

(Also works in CommonJS)

API

build(options) => SonicBoom

Creates a Pino transport (a Sonic-boom stream) to writing into files. Automatically rolls your files based on a given frequency, size, or both.

Options

You can specify any of Sonic-Boom options except dest

• file: absolute or relative path to the log file. Your application needs the write right on the parent folder. Number will be appened to this file name. When the parent folder already contains numbered files, numbering will continue based on the highest number. If this path does not exist, the logger with throw an error unless you set mkdir to true. file may also be a function that returns a string.

• size?: the maximum size of a given log file. Can be combined with frequency. Use k, m and g to express values in KB, MB or GB. Numerical values will be considered as MB.

• frequency?: the amount of time a given log file is used. Can be combined with size. Use daily or hourly to rotate file every day (or every hour). Existing file within the current day (or hour) will be re-used. Numerical values will be considered as a number of milliseconds. Using a numerical value will always create a new file upon startup.

• extension?: appends the provided string after the file number.

• symlink?: creates a symlink to the current log file. The symlink will be updated to the latest log file upon rotation. The name of the symlink is always called current.log.

• limit?: strategy used to remove oldest files when rotating them:

• limit.count?: number of log files, in addition to the currently used file.

• dateFormat?: the format for appending the current date/time to the file name. When specified, appends the date/time in the provided format to the log file name. Supports date formats from date-fns (see: date-fns format documentation). For example: Daily: 'yyyy-MM-dd' → error.2024-09-24.log Hourly: 'yyyy-MM-dd-hh' → error.2024-09-24-05.log

Please not that limit only considers created log files. It will not consider any pre-existing files. Therefore, starting your logger with a limit will never tries deleting older log files, created during previous executions.

License

MIT