logger#

Append formatted values to a log file asynchronously.

Install#

npm i @nodedk/logger

Usage#

var logger = require('@nodedk/logger')
var log = logger('application.log')

log('Application started')
log('Processed %d records for %s', 12, 'Ada')
log({ event: 'ready', workers: 2 })
log(new Date())

API#

logger(file)#

file is a file path, resolved from the working directory. Returns log(...args). The parent directory must exist.

log(...args)#

Appends a newline after each entry. Multiple arguments use util.format; a single object uses indented JSON, and a single Date uses ISO format. Returns undefined immediately.

If the file append fails, the same entry is written to standard output.

To route console output to a file:

var logger = require('@nodedk/logger')
var log = logger('application.log')

console.log = log
console.error = log

Created by Vidar Eldøy