Log errors with Winston.

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Features

This provides with two Winston formats:

• Full: includes all properties
• Short: includes only the error's name, message and stack

Unlike Winston's default error format:

• The error name is logged
• The full format logs nested errors, including cause and aggregate errors
• The full format is JSON-safe
• The short format optionally logs the stack trace
• The error instance is not modified

Example

Using the full format.

import { createLogger, transports, format } from 'winston'

import { fullFormat } from 'winston-error-format'

const logger = createLogger({
  format: format.combine(fullFormat(), format.json()),
  transports: [new transports.Http(httpOptions)],
})

const error = new ExampleError('Could not read file.')
error.filePath = '/...'
logger.error(error)
// Sent via HTTP:
// {
//   level: 'error',
//   name: 'ExampleError',
//   message: 'Could not read file.',
//   stack: `ExampleError: Could not read file.
//     at ...`,
//   filePath: '/...',
// }

Using the short format.

import { createLogger, transports, format } from 'winston'

import { shortFormat } from 'winston-error-format'

const logger = createLogger({
  format: format.combine(shortFormat(), format.cli()),
  transports: [new transports.Console()],
})

const error = new ExampleError('Could not read file.')
logger.error(error)
// Printed on the console:
// error: ExampleError: Could not read file.
//     at ...

Install

npm install winston-error-format

This package requires installing Winston separately.

npm install winston

This package works in Node.js >=18.18.0.

This is an ES module. It must be loaded using an import or import() statement, not require(). If TypeScript is used, it must be configured to output ES modules, not CommonJS.

API

fullFormat(options?)

options: Options
Return value: Format

Returns a logger format to combine with format.json() or format.prettyPrint(). This logs all error properties, making it useful with transports like HTTP.

Errors should be logged using logger.*(error).

shortFormat(options?)

options: Options
Return value: Format

Returns a logger format to combine with format.simple() or format.cli(). This logs only the error name, message and stack, making it useful with transports like the console.

Errors should be logged using logger.*(error).

Options

Type: object | ((Error) => object)

The options object can be error-specific by passing a function returning it instead.

stack

Type: boolean
Default: true

Whether to log the stack trace.

level

Type: string

Override the log level.

transform

Type: (Error) => Error

Maps the error before logging it.

Related projects

• winston: A logger for just about everything
• modern-errors: Handle errors in a simple, stable, consistent way
• modern-errors-winston: Log errors with Winston
• error-custom-class: Create one error class
• error-class-utils: Utilities to properly create error classes
• error-serializer: Convert errors to/from plain objects
• normalize-exception: Normalize exceptions/errors
• is-error-instance: Check if a value is an Error instance
• merge-error-cause: Merge an error with its cause
• set-error-class: Properly update an error's class
• set-error-message: Properly update an error's message
• wrap-error-message: Properly wrap an error's message
• set-error-props: Properly update an error's properties
• set-error-stack: Properly update an error's stack
• error-cause-polyfill: Polyfill error.cause
• handle-cli-error: 💣 Error handler for CLI applications 💥
• safe-json-value: ⛑️ JSON serialization should never fail
• log-process-errors: Show some ❤ to Node.js process errors
• error-http-response: Create HTTP error responses

Support

For any question, don't hesitate to submit an issue on GitHub.

Everyone is welcome regardless of personal background. We enforce a Code of conduct in order to promote a positive and inclusive environment.

Contributing

This project was made with ❤️. The simplest way to give back is by starring and sharing it online.

If the documentation is unclear or has a typo, please click on the page's Edit button (pencil icon) and suggest a correction.

If you would like to help us fix a bug or add a new feature, please check our guidelines. Pull requests are welcome!